Serializearray the efficiency of PHP's Array_diff function in handling large arrays

Cisa a method to submit to the official PHP BUG page

Copy the Code code as follows:

/**
* Fix PHP 5.2.6 or later Array_diff () function in processing
* Large array of problems that take an extra long time
*
* Finishing: http://www.CodeBit.cn
* Source: http://bugs.php.net/47643
*/
function Array_diff_fast ($data 1, $data 2) {
$data 1 = array_flip ($data 1);
$data 2 = Array_flip ($data 2);
foreach ($data 2 as $hash = = $key) {
if (Isset ($data 1[$hash])) unset ($data 1[$hash]);
}
Return Array_flip ($data 1);
}
?>

According to Chinaunix forum moderator Hightman Ideas to rewrite the method

Copy the Code code as follows:

/**
* Resolve PHP 5.2.6 or later the efficiency of the Array_diff () function when dealing with large arrays
* According to Chinaunix forum moderator Hightman Thinking method of writing
*
* Finishing: 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) {
Converts the key-value relationship of the second array
$secondArray = Array_flip ($secondArray);
Loop First Array
foreach ($firstArray as $key = = $value) {
If there is a value for the first array in the second array
if (Isset ($secondArray [$value])) {
Removes the corresponding element from the first array
Unset ($firstArray [$key]);
}
}
return $firstArray;
}
?>

This method only swaps the key and value of the second array, so it is more efficient.
Note: PHP's built-in Array_diff () function can handle multiple arrays, and the method provided in this article only handles comparisons of two arrays.

The above describes the Serializearray php Array_diff function in the handling of large arrays of efficiency, including the serializearray aspect of the content, I hope that the PHP tutorial interested in a friend to help.

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