PHP中fwrite与file_put_contents性能测试代码
这里测试的是往文件中写一百万行记录,如果数据量很小,比如1000条左右的记录,可能差距不大
function microtimeFloat() {
list($usec,$sec) = explode(" ", microtime());
return((float)$usec + (float)$sec);
}
1.测试file_put_contents
<?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,%s\n", $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:\myphp\research>php test2.php
PHP Warning: file_put_contents(ratings.txt): failed to open stream:Permission
denied in D:\myphp\research\test2.php on line 79
Warning: file_put_contents(ratings.txt): failed to open stream:Permission denie
d in D:\myphp\research\test2.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
<?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,%s\n", $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:\myphp\research>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。