开发错误集锦
emoji
utf8 編碼問題 https://laravel-china.org/top...
function nickname_encode($s){$chars = preg_split('//u', $s, null, PREG_SPLIT_NO_EMPTY);foreach ($chars as &$c) {if (strlen($c) > 3 || $c === "%"){$c = urlencode($c);}}return implode($chars);} 解碼直接用urldecode就行了。strtotime
var_dump(date("Y-m-d", strtotime("2017-06-31"))); //輸出2017-07-01 var_dump(date("Y-m-d", strtotime("-1 month", strtotime("2017-03-31")))); //輸出2017-03-03 var_dump(date("Y-m-d", strtotime("+1 month", strtotime("2017-08-31")))); //輸出2017-10-01 var_dump(date("Y-m-d", strtotime("next month", strtotime("2017-01-31")))); //輸出2017-03-03 var_dump(date("Y-m-d", strtotime("last month", strtotime("2017-03-31")))); //輸出2017-03-03var_dump(date("Y-m-d", strtotime("last day of -1 month", strtotime("2017-03-31")))); //輸出2017-02-28 var_dump(date("Y-m-d", strtotime("first day of +1 month", strtotime("2017-08-31")))); 輸出2017-09-01 var_dump(date("Y-m-d", strtotime("first day of next month", strtotime("2017-01-31")))); 輸出2017-02-01 var_dump(date("Y-m-d", strtotime("last day of last month", strtotime("2017-03-31")))); 輸出2017-02-28需要獲得多少天之前 $day mktime(0, 0, 0, date("m", $startTime), date("d", $startTime) - $day, date("Y", $startTime));這個坑在carbon中一樣的有. 比如:Carbon::now()->subMonth(1)->startOfMonth() 一樣的會出現上面說的問題. 你必須這樣寫:Carbon::now()->startOfMonth()->subMonth(1)Carbon::now()->subMonthNoOverflow(1)->startOfMonth() https://laravel-china.org/articles/17317$i = 12;while($i >= 1) {echo date('Y-m', strtotime('-' . $i . ' month', strtotime('2018-8'))) . "\n";$i--; }https://laravel-china.org/art...
解決方法
??
運算符可 用于判斷$a變量不存在的情況（也可用于數組），而使用三元運算符判斷一個未定義的變量，PHP會拋出異常。也正是因為這樣，用??判斷一個賦值為0的變量的時候結果是不一樣的。https://laravel-china.org/articles/17304?#reply64712 $a=0; $c=1; $b=$a??$c; echo 'a:'.$a.',b:'.$b.',c:'.$c; //a:0,b:0,c:1 $a=0; $c=1; $b=$a?$a:$c; echo 'a:'.$a.',b:'.$b.',c:'.$c; //a:0,b:1,c:1Error while reading line from the server. [tcp://127.0.0.1:6379]
redis 加了代理 Twemproxy，而 predis 對這個配置默認執行 select 操作，導致了連接錯誤。
大家以后要注意，如果 redis 有代理的話，別忘了把 'database' => 0,這個配置刪掉。
https://laravel-china.org/top...
PHP empty 函數判斷結果為空
class person {protected $attributes = [];public function __construct(array $attributes){$this->attributes = $attributes;}public function __get($name){return $this->attributes[$name] ?? null;} } https://laravel-china.org/articles/12530/the-shock-php-empty-function-is-empty-but-the-actual-value-is-nonemptyhttps://laravel-china.org/topics/3021/isset-is-not-right-after-upgrading-php7 var_dump($person->firstName,empty($person->firstName),isset($person->firstName),is_null($person->firstName) );Laravel Redis 多個進程同時取隊列問題
Laravel 使用 Redis 的 list 作為隊列的數據結構，并會為每個隊列分配一個 ID
Laravel 中入隊列方法
那么結論是：從 Laravel 的處理方式和打印的日志結果看，即使多個進程讀取同一個隊列，也不會讀取到一樣的數據。
隊列執行失敗之后根本不會執行failed方法
執行隊列偵聽器時加上 --tries參數即可，failed()方法只有在重試指定次數完成后才會調用failed()方法如：
http://blog.zhouchenxi.cn/pos...
php artisan queue:listen --queue=default,listeners --tries=3
順便提一下：如果指定了隊列名稱必須在偵聽器的參數上加上 --queue參數才行，不然沒有指定的隊列是不會運行的。
event 指定隊列
php7不支持 preg_replace e修正符
車輪升級PHP7踩過的一些坑 http://php.swoole.com/wiki/%E...
php5 php7不兼容的地方：https://segmentfault.com/a/11...
$joinStr = preg_replace("/__([A-Z_-]+)__/e",$prex.".strtolower('$1')",$joinStr); //替換為 preg_replace_callback("/__([A-Z_-]+)__/",function($r) use (&$joinStr){$joinStr = $prex.strtolower($r[1]); },$joinStr);內存溢出
//https://laravel-china.org/articles/16312/handling-large-amounts-of-data-to-write-files-to-avoid-memory-overflow-and-response-timeout $beginIndex = 0;$pageLimit = 50000;$endIndex = $beginIndex + $pageLimit;while ($pageData = \DB::connection('hub_log')->select("SELECT * FROM `{$tableName}` WHERE id > {$beginIndex} and id <= {$endIndex}")) {foreach ($pageData as $row) {file_put_contents(storage_path('mcd_rawdata/'.$tableName.'.txt'), $row->Content . "\n", FILE_APPEND);}$beginIndex += $pageLimit;$endIndex += $pageLimit;}$public_path = $time.'test.txt';DB::table('20171220')->orderBy('id')->chunk(10000,function($data) use ($public_path){$arr = '';foreach ($data->toArray() as $key => $value) {$arr .= $value->Content."\n";}file_put_contents(public_path($public_path),$arr, FILE_APPEND);unset($data);unset($arr);});git bash 輸入python命令停滯
$ python -i
$ winpty python -3
保留兩位小數
round(a,2)
r = lambda f: f - f % 0.01
int(a*100)/100
print("%.2f" %a)
后期綁定
https://www.v2ex.com/t/482659...
def testFun():return(lambda x : i*x for i in range(4)) for everyLambda in testFun():print(everyLambda(2)) & python test.py 0 2 4 6 def testFun():temp = [lambda x : i*x for i in range(4)]return temp for everyLambda in testFun():print(everyLambda(2)) & python test.py 6 6 6 6 第一個是括號(), 為生成器, 返回 generator 第二個是中括號[], 為列表生成式, 返回數組 列表表達式是即時計算的, 而生成器是迭代時才會計算{} + []
({}).valueOf() // [] // 返回來的是個對象,繼續調用 toString https://www.v2ex.com/t/480998#reply11 [].toString() // ""[] + 1// "1" [] + 'a' // "a"echo 后發送 header
使用 fastcgi_finish_request();（ PHP-fpm ）可以強制斷開客戶端連接 session 本質上是 header set-cookie，所以不算輸出。這里的輸出指的是 response body 的部分
https://www.v2ex.com/t/481127...
isset在php5.6-和php7.0+的一些差異
https://segmentfault.com/a/1190000016097997 class ProductCategory {const TYPES = [1 => 'type1',2 => 'type2', ];public function getType(){return isset(self::TYPES[$this->type]) ? self:TYPES[$this->type] : 'unrecognized_type';} } //把漢字拆分為數組 function ch2arr($str) {return preg_split('//u', $str, null, PREG_SPLIT_NO_EMPTY); }laravel 中使用 導出 excel 時報錯
PHPExcel_Calculation_Exception: Q5!A65 → Formula Error: An unexpected error occured in /application/www/web_git-pull/vendor/phpoffice/phpexcel/Classes/PHPExcel/Cell.php:291
原因：
在excel中一個單元格如果是以=開頭，則說明這個單元格是根據其他單元格的值算出來的，=后面必須跟著一個合法的表達式,而那個字符串是用戶的輸入，很明顯不應該是一個合法的表達式，所以應該在代碼中過濾掉
解決：
$str = "\t".$str;//同時解決 如 11111111111 顯示成 1.11111E+29
參考
https://github.com/Maatwebsit...
https://stackoverflow.com/que...
gzip UnicodeDecodeError
gzip解碼問題
import urllib.request import gzip# 注意要先讀取內容才可以解壓縮 data = urllib.request.urlopen(url).read() try:html =data.decode("utf-8") except:html =gzip.decompress(data).decode("utf-8")
Intervention/Image 圖片寫入中文
https://laravel-china.org/topics/13642/problems-encountered-in-writing-chinese-with-interventionimage-pictures-and-solutions function to_unicode($string) {$str = mb_convert_encoding($string, 'UCS-2', 'UTF-8');$arrstr = str_split($str, 2);$unistr = '';foreach ($arrstr as $n) {$dec = hexdec(bin2hex($n));$unistr .= '&#' . $dec . ';';}return $unistr; }獲取某字段修改前的值
Issue::saving(function(Issue $issue){if ($issue->isDirty('title')) {$user = Auth::user()->username;$oldTitle = $issue->getOriginal('title'); // 原始值$newTitle = $issue->title; // 新值ActionLog::log("$user 把標題 $oldTitle 修改為 $newTitle");} });前一天
https://www.cnblogs.com/lhm166/articles/6066762.html $mytime=mktime(0, 0, 0, date('m'), date('d')-1, date('Y'));//獲取時間戳 $mytime=date("Y-m-d H:i:s", strtotime("-1 day")); //獲取格式為2016-12-30 13:26:13 $timetoday = strtotime(date("Y-m-d",time())); function mdate($time = NULL) {$text = '';$time = $time === NULL || $time > time() ? time() : intval($time);$t = time() - $time; //時間差 （秒）$y = date('Y', $time)-date('Y', time());//是否跨年switch($t){case $t == 0:$text = '剛剛';break;case $t < 60:$text = $t . '秒前'; // 一分鐘內break;case $t < 60 * 60:$text = floor($t / 60) . '分鐘前'; //一小時內break;case $t < 60 * 60 * 24:$text = floor($t / (60 * 60)) . '小時前'; // 一天內break;case $t < 60 * 60 * 24 * 3:$text = floor($time/(60*60*24)) ==1 ?'昨天 ' . date('H:i', $time) : '前天 ' . date('H:i', $time) ; //昨天和前天break;case $t < 60 * 60 * 24 * 30:$text = date('m月d日 H:i', $time); //一個月內break;case $t < 60 * 60 * 24 * 365&&$y==0:$text = date('m月d日', $time); //一年內break;default:$text = date('Y年m月d日', $time); //一年以前break;}return $text; }function friend_date($time) {if (!$time)return false;$fdate = '';$d = time() - intval($time);$ld = $time - mktime(0, 0, 0, 0, 0, date('Y')); //得出年$md = $time - mktime(0, 0, 0, date('m'), 0, date('Y')); //得出月$byd = $time - mktime(0, 0, 0, date('m'), date('d') - 2, date('Y')); //前天$yd = $time - mktime(0, 0, 0, date('m'), date('d') - 1, date('Y')); //昨天$dd = $time - mktime(0, 0, 0, date('m'), date('d'), date('Y')); //今天$td = $time - mktime(0, 0, 0, date('m'), date('d') + 1, date('Y')); //明天$atd = $time - mktime(0, 0, 0, date('m'), date('d') + 2, date('Y')); //后天if ($d == 0) {$fdate = '剛剛';} else {switch ($d) {case $d < $atd:$fdate = date('Y年m月d日', $time);break;case $d < $td:$fdate = '后天' . date('H:i', $time);break;case $d < 0:$fdate = '明天' . date('H:i', $time);break;case $d < 60:$fdate = $d . '秒前';break;case $d < 3600:$fdate = floor($d / 60) . '分鐘前';break;case $d < $dd:$fdate = floor($d / 3600) . '小時前';break;case $d < $yd:$fdate = '昨天' . date('H:i', $time);break;case $d < $byd:$fdate = '前天' . date('H:i', $time);break;case $d < $md:$fdate = date('m月d日 H:i', $time);break;case $d < $ld:$fdate = date('m月d日', $time);break;default:$fdate = date('Y年m月d日', $time);break;}}return $fdate; }phpstorm xdebug
https://www.cnblogs.com/baoch...
https://www.cnblogs.com/niuxi...
https://laravel-china.org/top...
https://laravel-china.org/art...
https://laravel-china.org/art...
Python for 循環中的陷阱
https://www.v2ex.com/t/470443...
pyinstaller 打包 exe
pyinstaller -p venv_path (中間一定要有空格) you.py https://www.v2ex.com/t/476247...
http://ju.outofmemory.cn/entr...
php捕獲fatal error
function fatal_handler() {$errfile = "unknown file";$errstr = "shutdown";$errno = E_CORE_ERROR;$errline = 0;$error = error_get_last();if($error){//發送郵件隊列也可以http://www.iamtb.cn/2017/11/17/php-catch-fatel-error/file_put_contents('./testerror11.txt', json_encode($error));} } register_shutdown_function("fatal_handler"); try{$db=new db(); }catch(Exception $e){ echo $e->error_msg(); }PHP7開始，含十六進制字符串不再被認為是數字
$str = "0xffff";//https://segmentfault.com/q/1010000004829059 $int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX); if (false === $int) {throw new Exception("Invalid integer!"); } var_dump($int); // int(65535) $t1 = 0x3FFFFFFF & (1 * (0xd5b42e11)); $t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));var_dump($t1,$t2);php artisan config:cache
cat config/sentry.php return array('dsn' => env('SENTRY_LARAVEL_DSN'),// capture release as git sha// 'release' => trim(exec('git log --pretty="%h" -n1 HEAD')),// Capture bindings on SQL queries'breadcrumbs.sql_bindings' => true,// Capture default user context'user_context' => false,//transport function'transport'=>function(Raven_Client $raven_Client,&$data){$raven_Client->setTransport(null);$raven_Client->close_curl_resource();\Queue::pushOn('sentry',new \App\Commands\sentry($raven_Client,$data));}, );'transport'=>new \app\SentryTransport(), class SentryTransport {public static function __set_state($arr){return function($raven_Client,&$data){\Queue::pushOn('sentry',new \App\Commands\sentry($raven_Client,$data));};} }
curl超時
//重試 $ch = curl_init(); // curl_setopt ($ch, CURLOPT_URL, 'produc_redis.php.com'); curl_setopt ($ch, CURLOPT_URL, '11.11.11.1');https://segmentfault.com/a/1190000011188541 // I changed UA here curl_setopt ($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1');curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 2); curl_setopt ($ch, CURLOPT_AUTOREFERER, true); curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 2);$html = curl_exec($ch);var_dump($html,curl_error($ch));$num=3; for($i=1;$i<=$num;$i++){if(curl_getinfo($ch,CURLINFO_HTTP_CODE)=='0' && $i<=$num){echo "retry $i 次".PHP_EOL;if($i==3){curl_setopt ($ch, CURLOPT_URL, '220.181.57.217');}$html = curl_exec($ch);} }var_dump($html);var_dump(curl_error($ch));// var_dump(curl_getinfo($ch));/*** curl請求*https://segmentfault.com/a/1190000010197068* @param $url* @param string $postData* @param int $timeout* @return array|mixed* @throws Exception*/ protected static function post($url, $postData = '', $timeout = 5) {$ret = array();$times = 5;do {$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");curl_setopt($ch, CURLOPT_POST, true);curl_setopt($ch, CURLOPT_HEADER, false);if ($postData != '') {curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);}curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);// 重要, 該處不能丟 curl 執行最大秒數curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);$output = curl_exec($ch);if ($errNo = curl_errno($ch)) {error_log("Error [$errNo]: " . curl_error($ch));} else {$ret = json_decode($output, true);// 解析的結果集為空時停止查詢if (!is_array($ret) && !trim($ret)) {throw new Exception(__METHOD__ . ": cURL調用失敗, 信息為: " . $output);}unset($output);}curl_close($ch);if (isset($ret[0]) && $ret[0]) {return $ret;}} while ($times--);exit(__METHOD__ . ": cURL請求重試至 {$times} 次后仍無響應, 執行退出"); }cURL error 28
cURL error 28: See http://curl.haxx.se/libcurl/c/libcurl-errors.html $client=new GuzzleHttp\Client(); try {$tmp = $client->get($url,array("timeout"=>3,"connect_timeout"=>3));$res = json_decode(strval($tmp->getBody()),1); } catch (\Exception $e) {$res = [];\Log::info('error', ['url' => $url, 'msg' => $e->getMessage()]); } $client=new GuzzleHttp\Client();$requests=[$client->createRequest('GET',$url,["timeout"=>3,"connect_timeout"=>3]),$client->createRequest('GET',$url2,["timeout"=>3,"connect_timeout"=>3]),]; $result = Pool::batch($client, $requests, ['pool_size' => 2]); //$result->getResult($requests[0]) instanceof GuzzleHttp\Message\Response if ($result[0] instanceof Response && $result[0]->getStatusCode() == 200) {$data = json_decode($result[0]->getBody(), true);}格式化
import prettytable as pt https://www.v2ex.com/t/483984#reply15 ## 按行添加數據 tb = pt.PrettyTable() tb.field_names = ["City name", "Area", "Population", "Annual Rainfall"] tb.add_row(["Adelaide",1295, 1158259, 600.5]) tb.add_row(["Brisbane",5905, 1857594, 1146.4]) tb.add_row(["Darwin", 112, 120900, 1714.7]) tb.add_row(["Hobart", 1357, 205556,619.5])print(tb)#str.ljust 和 rjust 才是王道，誰用誰知道！+-----------+------+------------+-----------------+ | City name | Area | Population | Annual Rainfall | +-----------+------+------------+-----------------+ | Adelaide | 1295 | 1158259 | 600.5 | | Brisbane | 5905 | 1857594 | 1146.4 | | Darwin | 112 | 120900 | 1714.7 | | Hobart | 1357 | 205556 | 619.5 | +-----------+------+------------+-----------------+unicode
Unicode 每個字符的詳情，可以查官方文檔： https://www.unicode.org/charts/
python2 代碼：
for i in range(0x005b,0x005f):
print (unichr(i))#print (chr(i))
python3 代碼請查看 http://www.chenxm.cc/post/683...
unicode 字符表示方法 u + 16 進制數值,例如 u0001 print(''.join(chr(u) for u in range(0, 0x41))) u0040 這里 0040 就是 16 進制的，range 是左閉右開的，所以u0020-u0040 的碼點范圍是 range(0x00, 0x40+1)
0b 二進制 0o 八進制 0x 16 進制
0b10 // 2
0o10 // 8
0x10 // 16
unicode 字符表示方法 u + 16 進制數值,例如 u0001
print(u'u0061') // ahttps://www.v2ex.com/t/484923...
laravel更新后讀取數據失敗
https://laravel-china.org/articles/16566/take-a-laravel-mysql-to-verify-the-experience-of-bug#reply62596 //創建數據 $meeting = meeting::create($data);//查詢數據 $meeting = meeting::findOrFail($meeting->id);//紀錄操作日志 Log::insert($meeting); 線上數據庫是讀寫分離的，主庫寫入，但更新數據后馬上查詢，從庫可能沒來得及更新數據 當網絡不好時遇到從庫更新不及時 findOrFail 就會報 404，導致后面所有操作都失效，自然驗證也失效了 解決方法更新完后，查詢指定使用主庫 更新后禁止查詢，直接使用 create 返回的 model 實例，對于數據庫中的有默認值的字段，手動加入到 model 實例中批量更新
//https://laravel-china.org/topics/6864/how-to-batch-update-accumulate-a-field https://laravel-china.org/articles/16620/laravel-project-execl-batch-import-database-data-update-data-no-insertion $arr = [ // user_id => reward'1' => 50,'2' => 30,'3' => 60 ]; User::find(array_keys($arr))->each(function ($query) use ($arr) {$query->increment('award' , $arr[$query->id]); }); # 批量更新相同的 award User::find(array_keys($arr))->each->increment('award', 30);/*** 批量更新表的值，防止阻塞* @note 生成的SQL語句如下：* update mj_node set sort = case id* when 13 then 1* when 1 then 4* when 7 then 5* when 8 then 6* when 9 then 7* when 10 then 8* when 11 then 9* when 12 then 10* end where id in (13,1,7,8,9,10,11,12)* @param $conditions_field 條件字段* @param $values_field 需要被更新的字段* @param $conditions* @param $values* @return int*/public function batchUpdate($conditions_field, $values_field, $conditions, $values){$table = $this->model->getFullTableName();//返回完整表名，自己在項目中定義$sql = 'update ' . $table . ' set '. $values_field .' = case ' .$conditions_field;foreach ($conditions as $key => $condition) {$sql .= ' when ' . $condition . ' then ?';}$sql .= ' end where id in (' . implode(',', $conditions) . ')';return DB::update($sql, $values);//項目中需要引入DB facade}cat 多換行
https://www.v2ex.com/t/188162 調試shell腳本可以使用 sh -x ****.sh，有詳細輸出內容 Bash的echo默認在末尾加了換行符"\n"，所以你cat那個文件多了一個換行符，給echo加上-n參數就能不自動加換行符了。var= cat tmp.txt;echo $var"abc" 改成如下的形式var= `cat tmp.txt`;echo $var"abc"或者 #注意不是單引號，是tab鍵上面1前面的那個符號 var=$(cat tmp.txt);echo $var"abc"grep and or
https://blog.csdn.net/jackaduma/article/details/6900242 grep -E 'Tech|Sales' employee.txt grep -v 'pattern1' filename $ grep -E 'Manager.*Sales|Sales.*Manager' employee.txt # -E 'pattern1.*pattern2' egrep "php.*artisan.*$1" egrep 'pattern1|pattern2' filenamememcached 默認的過期時間則 不能大于 30 天
https://laravel-china.org/top...
cron 內容最后一行未回車
https://segmentfault.com/a/11... crontab -u www -e
unix:///tmp/supervisor.sock refused connection
[root@localhost supervisor]# supervisorctl -c /etc/supervisord.conf unix:///tmp/supervisor.sock refused connection supervisor> exitrm -f /tmp/supervisor.sock [root@localhost supervisor]# ps aux|grep super root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers] root 8246 0.0 0.1 208064 13404 ? Ss 18:17 0:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf supervisord是服務端，是個deamon，supervisorctl是客戶https://www.v2ex.com/t/210122 修改supervisor.conf文件后，要執行supervisorctl reload，重新加載配置文件 vi artisan.conf [root@localhost supervisor]# supervisorctl status unix:///tmp/supervisor.sock no such file [root@localhost supervisor]# ps aux|grep super root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers] root 19472 0.0 0.0 103256 844 pts/5 S+ 19:57 0:00 grep super [root@localhost supervisor]# supervisord -c /etc/supervisord.conf Error: Invalid user name www in section 'program:artisan_queue' (file: '/etc/supervisor/artisan.conf') For help, use /usr/bin/supervisord -h [root@localhost supervisor]# vi /etc/supervisor/artisan.conf [root@localhost supervisor]# supervisord -c /etc/supervisord.conf [root@localhost supervisor]# supervisorctl status artisan_queue BACKOFF Exited too quickly (process log may have details)http://blog.51cto.com/jxlwc/2112062 https://www.jianshu.com/p/3658c963d28bSpecified key was too long
https://laravel-china.org/articles/17094/larave-admin-installation?#reply64528 默認的數據庫字符集，現在utf8mb4包括存儲emojis支持。如果你運行MySQL v5.7.7或者更高版本，則不需要做任何事情。 https://laravel-china.org/articles/4195/laravel-54-common-error-specified-key-was-too-long https://segmentfault.com/a/1190000008416200 把config下的database.php下的mysql設置中,將'strict' => false就行了.. Schema::defaultStringLength(191); 是設置好的默認的字符串長度，也就是說，遷移中的字段沒有設置長度的話，varchar 字段會被默認成長度只有 191 use Illuminate\Support\Facades\Schema;public function boot() {Schema::defaultStringLength(191); }laravel with 查詢中只查詢個別字段
select 的時候沒有 id 的話就會為 null https://laravel-china.org/articles/17379 public function brand(){return $this->belongsTo(Brand::class, 'brandId')->select('id', 'briefCode');}$result = Brand::with(['brand' => function($query){$query->select('id', 'briefCode'); }])->get();PHP輸出A到Z
for($i='A'; $i<='Z'; $i++) {echo $i . '<br>'; } for($i=ord('A'); $i<=ord('Z'); $i++) {echo chr($i) . '<br>'; } for($i = 'A'; $i != 'BB'; $i++) {echo $i . '<br>'; }$al = 'A'; while($al != 'BB') {echo $al++ . '<br>'; }env函數的小坑
dump(env('APP_ENV') === null); // true 因為沒有執行 config:cache 命令，而項目上線后為了優化訪問速度，生成了緩存文件，導致env取值失敗 如果使用了config:cache，env函數只能在config目錄下的配置文件的php里使用，不可以在其他地方使用。一個非常簡單的辦法就是將 env('APP_ENV')改為config('app.env') config函數會優先讀取 bootstrap/cache/config.php 中緩存的配置，如果沒有緩存文件，則會直接讀取 config 目錄下的所有配置文件 https://www.jianshu.com/p/83f9cd407751任務調度的列表
//1. 加載Console內核 app()->make(\Illuminate\Contracts\Console\Kernel::class);//2. 獲取計劃任務列表 $scheduleList = app()->make(\Illuminate\Console\Scheduling\Schedule::class)->events();在模型事件中獲取某字段修改前的值
Issue::saving(function(Issue $issue){if ($issue->isDirty('title')) {$user = Auth::user()->username;$oldTitle = $issue->getOriginal('title'); // 原始值https://laravel-china.org/wikis/16169$newTitle = $issue->title; // 新值ActionLog::log("$user 把標題 $oldTitle 修改為 $newTitle");} });laravel SerializesModels
因為我們在任務類里引用了 SerializesModels 這個 trait，使得 Eloquent 模型在處理任務時可以被優雅地序列化和反序列化。如果你的隊列任務類在構造器中接收了一個 Eloquent 模型，那么只有可識別出該模型的屬性會被序列化到隊列里。當任務被實際運行時，隊列系統便會自動從數據庫中重新取回完整的模型。這整個過程對你的應用程序來說是完全透明的，這樣可以避免在序列化完整的 Eloquent 模式實例時所帶來的一些問題。https://laravel-china.org/top...
composer require失敗
cat composer.json "monolog/monolog": "^2.0@dev",$ composer require dees040/laravel-api-responses1/1: https://packagist.laravel-china.org/p/provider-latest$0449728151603 e355a0ee137fb34881e699652e41e3e1de11ba9c4ea7a47a312.jsonFinished: success: 1, skipped: 0, failure: 0, total: 1 Using version dev-master for dees040/laravel-api-responses ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages.Problem 1- The requested package monolog/monolog (locked at 1.23.0, required as ^2.0@dev ) is satisfiable by monolog/monolog[1.23.0] but these conflict with your requiremen ts or minimum-stability.Problem 2- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].- Can only install one of: monolog/monolog[2.x-dev, 1.x-dev].- Installation request for monolog/monolog ^2.0@dev -> satisfiable by monolog/m onolog[2.x-dev].- Installation request for laravel/framework (locked at v5.5.42, required as 5. 5.*) -> satisfiable by laravel/framework[v5.5.42].$composer require "monolog/monolog:~1.12"1/1: https://packagist.laravel-china.org/p/provider-latest$d12a81f48a3e1dad512c1d2c375298e3a8ea414dff5000d5f345939429c6b29b.jsonFinished: success: 1, skipped: 0, failure: 0, total: 1 ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev)1/1: https://dl.laravel-china.org/monolog/monolog/c465e1144536862e03f519cb3d65e924062cabfb.zipFinished: success: 1, skipped: 0, failure: 0, total: 1 Package operations: 0 installs, 1 update, 0 removals- Removing monolog/monolog (1.23.0)- Installing monolog/monolog (1.x-dev c465e11): Cloning c465e11445 from cache Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead. Writing lock file Generating optimized autoload files > Illuminate\Foundation\ComposerScripts::postAutoloadDump > @php artisan package:discover Discovered Package: 96qbhy/hyid Discovered Package: appstract/laravel-opcache Discovered Package: appstract/lush-http Discovered Package: barryvdh/laravel-debugbar Discovered Package: barryvdh/laravel-dompdf Discovered Package: barryvdh/laravel-ide-helper Discovered Package: base62/base62 Discovered Package: cblink/laravel-excel-zip Discovered Package: cblink/laravel-sso Discovered Package: chumper/zipper Discovered Package: encore/laravel-admin Discovered Package: encore/redis-manager Discovered Package: fideloper/proxy Discovered Package: foryoufeng/laravel-generator Discovered Package: ibrand/laravel-miniprogram-poster Discovered Package: intervention/image Discovered Package: itsgoingd/clockwork Discovered Package: jacobcyl/ali-oss-storage Discovered Package: jellybool/flysystem-upyun Discovered Package: jenssegers/agent Discovered Package: jenssegers/mongodb Discovered Package: laravel-admin-ext/helpers Discovered Package: laravel/tinker Discovered Package: latrell/lock Discovered Package: lubusin/laravel-decomposer Discovered Package: maatwebsite/excel Discovered Package: nesbot/carbon Discovered Package: overtrue/laravel-query-logger Discovered Package: overtrue/laravel-socialite Discovered Package: prettus/l5-repository Discovered Package: sentry/sentry-laravel Discovered Package: simplesoftwareio/simple-qrcode Discovered Package: spatie/laravel-tail Discovered Package: tymon/jwt-auth Discovered Package: zgldh/qiniu-laravel-storage Package manifest generated successfully.$ composer require dees040/laravel-api-responses1/1: https://packagist.laravel-china.org/p/provider-latest$14d9ca1b35af157c565d6c564cde71c59043d7457135c5a4317471625a1db2e7.jsonFinished: success: 1, skipped: 0, failure: 0, total: 1 Using version dev-master for dees040/laravel-api-responses ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev)1/1: https://dl.laravel-china.org/dees040/laravel-api-responses/9aec7eb323fc45e17f1dbb9c6e203d240836f91b.zipFinished: success: 1, skipped: 0, failure: 0, total: 1 Package operations: 1 install, 0 updates, 0 removals- Installing dees040/laravel-api-responses (dev-master 9aec7eb): Cloning 9aec7eb323 from cache Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead. Writing lock file Generating optimized autoload files > Illuminate\Foundation\ComposerScripts::postAutoloadDump > @php artisan package:discover$ composer require phpoffice/phpspreadsheet1/2: https://packagist.laravel-china.org/p/provider-latest$8512051929ea08e8189e440a1f5293135717f61525e93d6f4577794143032dd5.json2/2: https://packagist.laravel-china.org/p/provider-2018-10$4f971ac341cf575b7ed47aa09773abb926ec0c2baad56a0da2c9eed868beb649.jsonFinished: success: 2, skipped: 0, failure: 0, total: 2 Using version dev-master for phpoffice/phpspreadsheet ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages.Problem 1- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.- Installation request for maatwebsite/excel (locked at 3.0.9) -> satisfiable by maatwebsite/excel[3.0.9].Installation failed, reverting ./composer.json to its original content.suping3@BJ-D-212361A MINGW64 /d/code/blog $ composer require "phpoffice/phpspreadsheet:^1.2"1/3: https://packagist.laravel-china.org/p/provider-2018-10$edb575ac09ff566f26e69fb52521dbd7b5bd90cb0e97c11c04a834f1ba157b0b.json2/3: https://packagist.laravel-china.org/p/provider-latest$f7aba8aec5290950424531a654a2519842e07f0dcd995755aa8e64e7f622ad17.json3/3: https://packagist.laravel-china.org/p/provider-2018-07$1f1ac5377ce1027162f91a3db54217c36e38f7ae18744629e6e89c5e6d410c78.jsonFinished: success: 3, skipped: 0, failure: 0, total: 3 ./composer.json has been updated Loading composer repositories with package information Updating dependencies (including require-dev)1/1: https://dl.laravel-china.org/phpoffice/phpspreadsheet/2dfd06c59825914a1a325f2a2ed13634b9d8c411.zipFinished: success: 1, skipped: 0, failure: 0, total: 1Fatal error: Class 'PHPUnit_Framework_TestCase' not found
https://github.com/dees040/laravel-api-responses/issues/2 vi vendor/dees040/laravel-api-responses/tests/ResponseTest.phpclass ResponseTest extends \PHPUnit\Framework\TestCase$ phpunit vendor/dees040/laravel-api-responses/tests/ResponseTest.php PHPUnit 6.5.3 by Sebastian Bergmann and contributors............... 14 / 14 (100%)Time: 378 ms, Memory: 16.00MBLaravel 的 collection
$collection = new \Illuminate\Database\Eloquent\Collection(['item a', 'item b', 'item c']); $collection = $collection->unique(); 執行時候會報錯PHP Fatal error: Call to a member function getKey() on string in /Project/nginx/webbpm-dev.ssl.lol/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Collection.php on line 259[Symfony\Component\Debug\Exception\FatalErrorException]Call to a member function getKey() on string 這是因為 Illuminate\Database\Eloquent\Collection 通過調用自身的 getDictionary 方法，使用根據主鍵去重復的邏輯覆蓋了 Illuminate\Support\Collection 的邏輯。以上代碼改成https://laravel-china.org/topics/18696$collection = collect(['item a', 'item b', 'item c']); $collection = $collection->unique();使用"mews/captcha:~2.0" 驗證碼圖片不顯示問題
Symfony\Component\Debug\Exception\FatalThrowableError: Call to undefined function Intervention\Image\Gd\imagettfbbox() in file /usr/share/nginx/html/LaraBBS/vendor/intervention/image/src/Intervention/Image/Gd/Font.php on line 85如果已經開啟了gd，請參考下 https://laravel-china.org/articles/18815?#reply69185 FROM php:7.0-fpm RUN apt-get update && apt-get install -y \ libfreetype6-dev \ libjpeg62-turbo-dev \ libmcrypt-dev \ libpng-dev \ && docker-php-ext-install -j$(nproc) iconv mcrypt \ && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \ && docker-php-ext-install -j$(nproc) gd在解析外部變量時的一個問題
//https://segmentfault.com/a/1190000017051950 <form method="post"><input type="text" name="id[]" value="1"><input type="text" name="id[]_text" value="a"><input type="text" name="id[]" value="2"><input type="text" name="id[]_text" value="b"><input type="submit"> </form> var_export($_POST); array ('id' => array (0 => '1',1 => 'a',2 => '2',3 => 'b',), ) $foo["id"] = 1; $foo["id[]_text"] = 2;var_export($foo);extract($foo);var_export(get_defined_vars());Laravel with () limit
比如如何取得每篇文章中的前10條評論 下面為錯誤寫法：https://laravel-china.org/articles/19932essay::with(['comment' => function($query) {$query->take(10) }]) public function products() {return $this->belongsToMany(Hproduct::class,'hproduct_has_type','type_id','product_id'); }public function topTenproducts() {return $this->products()->with('supplier')->where('is_sale','=',1)->limit(4); }public function getProdcutsWithtopTenproducts($col) {$model = $this->whereIn('id',$col)->get();$model->each(function ($model) {$model->load('topTenproducts');});return $model->toArray(); }laravel 5.5 索引長度超過限制
laravel5.4中改變了默認的編碼類型(utf8 => utf8mb4), 從而使email字段索引長度超過了的默認限制長度 https://laravel-china.org/articles/18306 InnoDB 引擎中：uft8 varchar 最大長度 255 utf8mb4 varchar 最大長度 191 設置一下 varchar 的長度不超過 191 即可table->string('email')->index(); varchar會使用utf8mb4編碼, utf8mb4編碼(4bytes)屬于utf8編碼(3bytes)的擴展類型, 由此可以計算索引長度為255*4+2=1022 >767 $ php artisan migrate Migration table created successfully.In Connection.php line 664:SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes (SQL: alter table `users` add unique`users_email_unique`(`email`))golang序列化失敗
ret, _ := json.Marshal(result)//https://www.hchstudio.cn/article/2018/2622/ 發現是結構體定義有問題，當定義結構體時首字母必須大寫才能序列化成功，這個特點在golang里面很是明顯，在函數調用時首字母小寫的函數在其他文件里面是調不到的。下面給出正確的結構體定義 type ResultCode struct {Msg string `json:"msg"`Code int `json:"code"`Data string `json:"data"` }總結
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