serializearray PHP's array_diff function efficiency issues when processing large arrays

The method for cisa to submit to the PHP official BUG page

Copy the code The code is as follows:

/**
* Solve the problem that the array_diff() function in PHP 5.2.6 and above takes a long time when processing
* large arrays
*
* Compilation: http://www.CodeBit.cn
* Source: http:/ /bugs.php.net/47643
*/
function array_diff_fast($data1, $data2) {
$ data1 = array_flip($data1);
$data2 = array_flip($data2);
foreach($data2 as $hash => $key) {
if (isset($data1[$hash])) unset($data1 [$hash]);
}
return array_flip($data1);
}
?> /**

* Solve the efficiency problem of the array_diff() function in PHP 5.2.6 and above when processing large arrays
* The method written according to the idea of ​​hightman, the moderator of ChinaUnix Forum
*

* Organized by: http://www.CodeBit.cn * Reference: http://bbs.chinaunix.net/viewthread.php?tid=938096&rpid=6817036&ordertype=0&page=1#pid6817036 */ function array_diff_fast($firstArray, $secondArray) { // Convert the key-value relationship of the second array

$secondArray = array_flip($secondArray);

// Loop The first array
foreach($firstArray as $key => $value) {
// If the value of the first array exists in the second array
if (isset($secondArray[$value])) {
// Remove the corresponding element in the first array
unset($firstArray[$key]);
}
}
return $firstArray;
}
?>


This method only exchanges the second array key and value, so it is more efficient.
Note: PHP’s built-in array_diff() function can handle multiple arrays, but the method provided in this article only handles the comparison of two arrays.
The above introduces the efficiency issues of serializearray PHP's array_diff function when processing large arrays, including the content of serializearray. I hope it will be helpful to friends who are interested in PHP tutorials.