個人覺得就是2點優化

1、分塊，分塊以后遍歷不用每次從頭開始定位

2、快速定位，可以將字符驗證改成整數驗證

$str = "中國人abc蓅氓澮娬朮國人ac娬朮";

$str = str_pad('', 1024*1024, $str);

mb_internal_encoding("UTF-8");

$time = time();

$len = mb_strlen($str);

// 按照千字一組

$group_size = 500;

$group_total = ceil($len / $group_size);

$chars = array();

$result = '';

for($i = 0; $i < $group_total; $i++) {

$tmp = mb_substr($str, 0, $group_size);

// 這里如果處理1組字符了，就將前1組理掉

$str = mb_substr($str, $group_size, $len > $group_size ? $len - $group_size : $len);

$len = mb_strlen($str);

if($i % 50 == 49) {

printf("process %d groups, total %d groups, run time %dn", $i + 1, $group_total, time()-$time);

}

// 處理字符

$tmp_len = $i < $group_total - 2 ? $group_size : mb_strlen($tmp);

for($j = 0; $j < $tmp_len; $j++) {

$char = mb_substr($str, $i, 1);

$num = hexdec(bin2hex($char));

if(isset($chars[$num])) {

continue;

} else {

$chars[$num] = 1;

$result .= $char;

}

}

}

var_dump($result);

輸出

process 50 groups, total 870 groups, run time 4

process 100 groups, total 870 groups, run time 9

process 150 groups, total 870 groups, run time 13

process 200 groups, total 870 groups, run time 18

process 250 groups, total 870 groups, run time 22

process 300 groups, total 870 groups, run time 27

process 350 groups, total 870 groups, run time 31

process 400 groups, total 870 groups, run time 35

process 450 groups, total 870 groups, run time 40

process 500 groups, total 870 groups, run time 44

process 550 groups, total 870 groups, run time 48

process 600 groups, total 870 groups, run time 52

process 650 groups, total 870 groups, run time 56

process 700 groups, total 870 groups, run time 60

process 750 groups, total 870 groups, run time 65

process 800 groups, total 870 groups, run time 69

process 850 groups, total 870 groups, run time 73

string(27) "氓娬蓅cab人國朮中澮"

總結

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