PHP fwrite and file_put_contents Performance test code _php skills

function Microtimefloat () {
List ($usec, $sec) = Explode ("", Microtime ());
Return ((float) $usec + (float) $sec);
}

1. Test file_put_contents

Copy Code code as follows:

<?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);
?>

Test results:
There was an error opening the file during the test, and the data written after the execution of the program was incomplete, only 999997 lines, and 3 lines were missing. The most important point is that the time spent more than 307 seconds, and with Fwrite only spent 10 seconds more time, the gap is not small.

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. Test fwrite

Copy Code code as follows:

<?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 + +) {
    $uid =random;
    for ($j = 0; $j < $itemCount; $j + +) {
       $itemId = Mt_rand (1, 30 0000);
       $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);

Test results:
Write 1 million lines of records, 10 seconds or so written, for PHP, the speed is good. This was tested on my PC, and if tested on a production machine, it might be faster.
d:\myphp\research>php test2.php
Spend Time: |10.764221191406|second (s)

The data written with Fwrite is complete.
999997,qovczyfjflfhjigygxac615koxdx3yii,246982,0.03
999998,qovczyfjflfhjigygxac615koxdx3yii,240160,0.39
999999,qovczyfjflfhjigygxac615koxdx3yii,46296,0.61
1000000,qovczyfjflfhjigygxac615koxdx3yii,26211,0.14

3. Summary
If you want to write a large number of data to the file, it is recommended to use fwrite, do not use file_put_contents. Fwrite is also recommended in high concurrent requests.