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PHP Function uksort()
Syntax
uksort ( $array, $cmp_function )
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Definition and Usage
The uksort() function sorts an array by the element keys using user defined comparison function.
Paramters
Parameter | Description |
array | Required. Specifies an array. |
cmp_function | Required. Usef defined function to compare values and to sort them.
The function must return -1, 0, or 1 for this method to work correctly.
It should be written to accept two parameters to compare, and it should work
something like this:
- If a = b, return 0
- If a > b, return 1
- If a < b, return -1
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Return Value
Returns TRUE on success or FALSE on failure.
Example
Try out following example:
<?php
function cmp_function($a, $b)
{
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana" );
uksort($fruits, "cmp_function");
print_r($fruits);
?>
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This will produce following result:
Array ( [d] => lemon [b] => banana [a] => orange )
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