uksort ( $cmp_function )

This function sorts the keys of the entries using a user-supplied comparison function. The key to entry correlations will be maintained.

Access

public

Parameters

Parameter

Type

Required

Description

$cmp_function

callable

Required

The callback comparison function.

Function cmp_function should accept two parameters which will be filled by pairs of entry 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

Type

Description

void

No value is returned.

Examples

example

function cmp($a, $b) {
    $a = preg_replace('@^(a|an|the) @', '', $a);
    $b = preg_replace('@^(a|an|the) @', '', $b);
    return strcasecmp($a, $b);
}

$array = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);
$arrayObject = new ArrayObject($array);
$arrayObject->uksort('cmp');

foreach ($arrayObject as $key => $value) {
    echo "$key: $value\n";
}
Result:
an apple: 3
a banana: 4
the Earth: 2
John: 1

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