用戶評(píng)論:

[#1]

csouth at xistins dot com [2014-12-14 08:41:04]

An?earlier?comment?referenced?a?code?snippet?that?showed?file_put_contents()?was?faster?the?touch?for?creating?files.?I?re-ran?the?same?tests?on?PHP?5.5.9?and?this?seems?to?no?longer?be?the?case.

$startTime=microtime(true);

for($i=0;$i<100000;$i++)

{file_put_contents('dir/file'.$i,'');unlink('dir/file'.$i);

}

echo"Time:?".(microtime(true)-$startTime)."\n";//?Time:?2.6902809143066$startTime=microtime(true);

for($i=0;$i<100000;$i++)

{touch('dir/file'.$i);unlink('dir/file'.$i);

}

echo"Time:?".(microtime(true)-$startTime)."\n";//?Time:?2.3343770503998?>

[#2]

anon [2013-11-10 16:38:56]

Note?that?when?PHP?is?called?by?f.e.?apache?or?nginx?instead?of?directly?from?the?command?line,?touch()?will?not?prefix?the?location?of?the?invoking?script,?so?the?supplied?filename?must?contain?an?absolute?path.

With?script?started?from?/home/user/www,?this?will?not?touch?"/home/user/www/somefile":

touch('somefile');?>

But?this?will:

touch(__DIR__.'/somefile');?>

[#3]

bosslog at gmail dot com [2010-10-08 14:11:13]

I?has?passed?a?small?test?to?check?which?function?is?faster?to?create?a?new?file.

file_put_contents?vs?touch

{file_put_contents('dir/file'.$i,'');

}?>

Average?time:?0,1145s

{touch('dir/file'.$i);

}?>

Average?time:?0,2322s

So,?file_put_contents?is?faster?than?touch,?about?two?times.

[#4]

chris dot dallaire at csquaredsystems dot com [2010-04-09 07:41:54]

I?needed?to?use?this?to?touch?the?/etc/cron.d?directory?when?I?updated?some?files?in?there.?I?know?the?docs?say?this?isn't?necessary,?but?I'm?finding?that?i?need?to?do?it?in?order?form?my?changes?to?be?picked?up?quickly.

I?ran?into?the?permissions?error?as?well?and?I?found?that?using?chmod?777?/etc/cron.d?does?the?trick.

So,?you?should?be?able?to?use?the?PHP?touch?function?on?a?directory?that?has?open?write?access.

Of?course,?this?isn't?the?most?secure?approach,?but?in?our?application?it's?not?a?big?deal?for?that?folder?to?not?be?super?secure.

[#5]

ernst at cron-it dot de [2009-09-29 06:38:30]

To?touch?a?file?without?being?owner,?it?is?much?easier:

}?>

[#6]

info at archiwumrocka dot art dot pl [2008-12-01 13:59:50]

Only?way?to?change?modification?date?in?catalogue?is?to?create?file?in?via?touch()?and?dalete?it?with?unlink():

$dir='temp';$files1=scandir($dir);$files1=array_slice($files1,2);

foreach?($files1as$key=>$val)

{

if?(!is_dir($val))?continue;

if?(!touch($val))

{touch($val."/plik.txt");unlink($val."/plik.txt");

}

}?>

[#7]

mrgrier at yahoo dot com [2008-11-29 10:29:55]

At?least?on?Linux,?touch?will?not?change?the?time?on?a?symlink?itself,?but?on?the?file/directory?it?points?to.?The?only?way?to?work?around?this?is?to?unlink?the?symlink,?then?recreate?it.

It?took?a?bit?of?searching?to?discover?this.?The?OS?itself?provides?no?way?to?do?it.?Many?people?wondered?why?anyone?would?want?to?do?this.?I?use?symlinks?inside?a?web?tree?to?point?to?files?outside?the?web?tree.?After?a?certain?length?of?time?has?passed,?I?want?the?symlinks?to?die,?so?the?files?cannot?be?successfully?hotlinked.

[#8]

ddalex at gmail dot com [2008-11-03 09:25:05]

Actually,?Glen?is?right,?PHP?won't?touch?if?it?is?not?the?current?owner?of?the?file,?even?if?the?directory?and?files?are?writeable?by?the?PHP?user.

[#9]

Radon8472 [2008-08-08 05:07:37]

Important?info:

touch()?used?on?a?directory?always?returns?FALSE?and?prints?"Permission?denied"?on?NTFS?and?FAT?Filesystem?(tested?on?winXP).

[#10]

Jeff [2008-06-26 12:29:10]

I've?been?trying?to?set?a?filemtime?into?the?future?with?touch()?on?PHP5.

It?seems?touch?$time?has?a?future?limit?around?1000000?seconds?(11?days?or?so).?Beyond?this?point?it?reverts?to?a?previous?$time.

It?doesn't?make?much?sense?but?I?could?save?you?hours?of?time.

$time?=?time()+1500000;

touch($cachedfile,$time);

[#11]

Glen [2007-10-18 13:01:58]

In?unix?on?the?command-line,?you?can?touch?files?you?don't?own?-?but?like?other?comments?on?this?page?state?-?PHP's?built?in?touch?won't?work.

I?simple?alternative?(on?unix):

{exec("touch{$filename}");

}?>

[#12]

Charles Belov [2006-07-18 18:10:14]

Update?the?access?time?without?updating?the?modified?time:

Unix?command:?touch?-a?filename

PHP:?touch(filename,?date('U',?filemtime(filename)),?time())

[#13]

spam at webmastersguide dot com [2005-09-01 05:09:00]

If?you're?going?to?go?around?deleting?(unlinking)?files

that?you?don't?own?just?in?order?to?change?the?modification

time?on?the?file,?you?darn?well?better?chown()?the?file

back?to?it's?original?ownership?after?you?are?done?and

chmod()?it?back?to?it's?correct?permissions.??Otherwise

you?will?almost?certainly?break?things.??Additionally?the

code?listed?for?touch()ing?a?file?you?don't?own?should

set?the?file?creation?time?back?to?it's?original?time?if

what?is?wanted?is?to?just?change?the?modification?time.

Also,?the?code?listed?will?break?things?if?there?is?an?i/o

error?such?as?disk?full?or?too?many?files?in?the?directory.

Here's?how?the?code?SHOULD?be?written:

Create?the?new?file?FIRST,?rather?than?last,?with?a?different

name?such?as?$file.tmp.

Read?the?ownership,?permissions,?and?creation?time?of?the?old?file.

Set?permissions?and?creation?time?of?the?new?file?the?same?as?the?old.

Rename?the?new?file?to?the?name?of?the?old.

chown()?the?new?file?to?the?user?that?owned?the?file?it's?replacing.

Please?be?careful?adding?to?the?documentation?if?you've

never?taken?programming?101.

[#14]

rf_public at yahoo dot co dot uk [2005-07-25 12:19:14]

Note:?the?script?to?touch?a?file?you?don't?own?will?change?it's?owner?so?ensure?permissions?are?correct?or?you?could?lose?access?to?it

[#15]

guy at forster design dot com [2005-05-12 03:42:33]

Here's?a?little?workaround?that?allows?the?PHP?user?to?touch?a?file?it?doesn't?own:

$target_file="/path/to/file/filename.txt";//system?filepath?to?your?file$file_content=implode("",file($target_file));

@unlink($target_file);

if($savetofile=fopen($target_file,"w"))?{fputs($savetofile,$file_content);fclose($savetofile);

}$new_date=strtotime("23?April?2005");//?set?the?required?date?timestamp?heretouch($target_file,$new_date);?>

Of?course,?PHP?needs?to?have?write?access?to?the?folder?containing?the?file?you?want?to?touch,?but?that?should?be?easy?to?arrange.

[#16]

feathern at yahoo dot com [2002-08-13 15:31:07]

Neat?little?script?that?will?give?you?a?list?of?all?modified?files?in?a?certain?folder?after?a?certain?date:

$filelist?=?Array();

$filelist?=?list_dir("d:\\my_folder");

for($i=0;$i

$test?=?Array();

$test?=?explode("/",date("m/d/Y",filemtime($filelist[$i])));

//example?of?files?that?are?later?then

//06/17/2002

if(($test[2]?>?2001)?&&?($test[1]?>?16)?&&?($test[0]?>?5)){

echo?$filelist[$i]."\r\n";

}

clearstatcache();

}

function?list_dir($dn){

if($dn[strlen($dn)-1]?!=?'\\')?$dn.='\\';

static?$ra?=?array();

$handle?=?opendir($dn);

while($fn?=?readdir($handle)){

if($fn?==?'.'?||?$fn?==?'..')?continue;

if(is_dir($dn.$fn))?list_dir($dn.$fn.'\\');

else?$ra[]?=?$dn.$fn;

}

closedir($handle);

return?$ra;

}

[#17]

emilebosch at hotmail dot com [2001-10-06 15:41:56]

To?spare?you?ppl?couple?of?hours?of?valuable?time,?you?can?only?TOUCH?a?file?that?you?own!?Usually?PHP?is?*nobody*

Warm?regards,

Emile?Bosch

[#18]

master at dreamphp dot com [2001-05-15 11:23:09]

$filename?=?"test.dat";

if?(!file_exists($filename))?{

touch($filename);?//?Create?blank?file

chmod($filename,0666);

}

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