(PHP 3>= 3.0.4, PHP 4 , PHP 5)
uksort --
Sort an array by keys using a user-defined comparison function
Description
bool
uksort ( array &array, callback cmp_function )
uksort() 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.
Function cmp_function should accept two
parameters which will be filled by pairs of array keys.
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.
Returns TRUE on success or FALSE on failure.
Example 1. uksort() example
<?php
function cmp($a, $b)
{
if ($a == $b) {
return 0;
}
return ($a > $b) ? -1 : 1;
}
$a = array(4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");
uksort($a, "cmp");
while (list($key, $value) = each($a)) {
echo "$key: $value\n";
}
?>
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The above example will output: 20: twenty
10: ten
4: four
3: three |
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See also usort(), uasort(),
sort(), asort(),
arsort(), ksort(),
natsort(), and rsort().
