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PHP Function uasort()
Syntax
uasort ( $array, $cmp_function )
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Definition and Usage
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order is significant. The comparison function is user-defined.
Paramters
Parameter | Description |
array | Required. Specifies an array. |
cmp_function | Required. Usef defined function to compare values and to sort them.
The function must return -1, 0, or 1 for this method to work correctly.
It should be written to accept two parameters to compare, and it should work
something like this:
- If a = b, return 0
- If a > b, return 1
- If a < b, return -1
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Return Value
Returns TRUE on success or FALSE on failure.
Example
Try out following example:
<?php
function cmp_function($a, $b)
{
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana" );
uasort($fruits, "cmp_function");
print_r($fruits);
?>
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This will produce following result:
Array ( [a] => orange [d] => lemon [b] => banana )
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