function microtimeFloat() {
list($usec,$sec) = explode(" ", microtime());
return((float)$usec + (float)$sec);
}
1.測試file_put_contents
復制代碼 代碼如下:$timeStart = microtimeFloat();
for ($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);
?>
測試結果:
測試過程中出現了打開文件的錯誤,而且程序執行完成以後寫入的數據不完整,只有999997行,漏了3行。最重要的一點是時間花了307秒多,而用fwrite只花了10秒多的時間,差距還是不小的。
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.測試fwrite
復制代碼 代碼如下:$fp = @fopen($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);
?>
測試結果:
寫一百萬行記錄,10秒左右寫完,對於PHP來說,速度算不錯了。這是在我的個人電腦上面測試的,如果在生產機上測試,可能速度還要快一些。
D:myphpresearch>php test2.php
Spend time: |10.764221191406|second(s)
用fwrite寫入的數據是完整的
999997,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,246982,0.03
999998,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,240160,0.39
999999,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,46296,0.61
1000000,QOvcZYFJFlFHjiGyGxAc615kOXdX3Yii,26211,0.14
3.總結
如果要往文件裡面寫入大量的數據,則推薦用fwrite,不要用file_put_contents。在高並發的請求中也建議用fwrite。