PHP中fwrite与file_put_contents性能测试代码

function microtimeFloat() {

list($usec,$sec) = explode(" ", microtime());

return((float)$usec + (float)$sec);

}

1.测试file_put_contents

复制代码 代码如下:

<?php

$userCount = 1000;

$itemCount = 1000;

$file = 'ratings.txt';

file_exists($file) &&unlink($file);

$timeStart = microtimeFloat();

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

$uid =random(32);

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

$itemId = mt_rand(1, 300000);

$rating = $j == 0 ? 1 : mt_rand(1, 100) / 100;

$line = sprintf("%s,%d,%sn", $uid, $itemId, $rating);

file_put_contents($file, $line, FILE_APPEND);

}

}

$timeEnd = microtimeFloat();

echo sprintf("Spend time: |%s| second(s)n", $timeEnd -$timeStart);

?>

测试结果:

测试过程中出现了打开文件的错误，而且程序执行完成以后写入的数据不完整，只有999997行，漏了3行。最重要的一点是时间花了307秒多，而用fwrite只花了10秒多的时间，差距还是不小的。

D:myphpresearch>php test2.php

PHP Warning: file_put_contents(ratings.txt): failed to open stream:Permission

denied in D:myphpresearchtest2.php on line 79

Warning: file_put_contents(ratings.txt): failed to open stream:Permission denie

d in D:myphpresearchtest2.php on line 79

Spend time: |307.0586669445|second(s)

...

999994:98xDtLjaeD8MG9ywifegZvRRQzVBZbbw,167670,0.15

999995:98xDtLjaeD8MG9ywifegZvRRQzVBZbbw,234223,0.13

999996:98xDtLjaeD8MG9ywifegZvRRQzVBZbbw,84947,0.79

999997:98xDtLjaeD8MG9ywifegZvRRQzVBZbbw,6489,0.38

2.测试fwrite

复制代码 代码如下:

<?php

$userCount = 1000;

$itemCount = 1000;

$file = 'ratings.txt';

file_exists($file) &&unlink($file);

$fp = @fopen($file, 'ab');

if (!$fp) die("Open $file failed");

$timeStart = microtimeFloat();

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

$uid =random(32);

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

$itemId = mt_rand(1, 300000);

$rating = $j == 0 ? 1 : mt_rand(1, 100) / 100;

$line = sprintf("%s,%d,%sn", $uid, $itemId, $rating);

fwrite($fp, $line);

$k++;

}

}

if ($fp) @fclose($fp);

$timeEnd = microtimeFloat();

echo sprintf("Spend time: |%s| second(s)n", $timeEnd -$timeStart);

?>

测试结果:

写一百万行记录，10秒左右写完，对于PHP来说，速度算不错了。这是在我的个人电脑上面测试的，如果在生产机上测试，可能速度还要快一些。

D:myphpresearch>php test2.php

Spend time: |10.764221191406|second(s)

用fwrite写入的数据是完整的

999997,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,246982,0.03

999998,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,240160,0.39

999999,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,46296,0.61

1000000,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,26211,0.14

3.总结

如果要往文件里面写入大量的数据，则推荐用fwrite，不要用file_put_contents。在高并发的请求中也建议用fwrite。