UKSORT(3) 1 UKSORT(3)
uksort - Sort an array by keys using a user-defined comparison function
SYNOPSIS
bool uksort (array &$array, callable $key_compare_func)
DESCRIPTION
uksort(3) will sort the keys of an array using a user-supplied comparison function. If the array you wish to sort needs to be sorted by
some non-trivial criteria, you should use this function.
PARAMETERS
o $array
- The input array.
o $key_compare_func
- The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to
be respectively less than, equal to, or greater than the second.
int callback (mixed $a, mixed $b)
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
uksort(3) example
<?php
function cmp($a, $b)
{
$a = preg_replace('@^(a|an|the) @', '', $a);
$b = preg_replace('@^(a|an|the) @', '', $b);
return strcasecmp($a, $b);
}
$a = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);
uksort($a, "cmp");
foreach ($a as $key => $value) {
echo "$key: $value
";
}
?>
The above example will output:
an apple: 3
a banana: 4
the Earth: 2
John: 1
SEE ALSO
usort(3), The comparison of array sorting functions.
PHP Documentation Group UKSORT(3)