PHP uasort() function

example

Use the user-defined comparison function to compare the array $arr The key values of the elements in the ：

<?php
function my_sort($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}

$arr=array("a"=>4,"b"=>2,"c"=>8,d=>"6");
uasort($arr,"my_sort");
?>

Definition and Usage

uasort() Function to sort an array using a user-defined comparison function , And keep index Association （ Don't assign new keys to elements ）.

Return if successful TRUE, Otherwise return to FALSE.

This function is mainly used to sort the associative arrays whose cell order is very important .

grammar

uasort(array,myfunction);

Parameters	describe
array	It's necessary . Specify the array to sort .
myfunction	Optional . Define the string that can call the comparison function . If the first parameter is less than or equal to or greater than the second parameter , Then the comparison function must return a value less than or equal to or greater than 0 The integer of .

Technical details

Return value ：	Return if successful TRUE, If it fails, return to FALSE.
PHP edition ：	4+