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--TEST--
Test usort() function : usage variations - referenced variables
--FILE--
<?php
/* Prototype : bool usort(array $array_arg, string $cmp_function)
* Description: Sort an array by values using a user-defined comparison function
* Source code: ext/standard/array.c
*/
/*
* Pass an array of referenced variables as $array_arg to test behaviour
*/
echo "*** Testing usort() : usage variation ***\n";
function cmp_function($value1, $value2)
{
if($value1 == $value2) {
return 0;
}
else if($value1 > $value2) {
return 1;
}
else {
return -1;
}
}
// different variables which are used as elements of $array_arg
$value1 = -5;
$value2 = 100;
$value3 = 0;
$value4 = &$value1;
// array_args an array containing elements with reference variables
$array_arg = array(
0 => 10,
1 => &$value4,
2 => &$value2,
3 => 200,
4 => &$value3,
);
echo "\n-- Sorting \$array_arg containing different references --\n";
var_dump( usort($array_arg, 'cmp_function') );
var_dump($array_arg);
?>
===DONE===
--EXPECTF--
*** Testing usort() : usage variation ***
-- Sorting $array_arg containing different references --
bool(true)
array(5) {
[0]=>
&int(-5)
[1]=>
&int(0)
[2]=>
int(10)
[3]=>
&int(100)
[4]=>
int(200)
}
===DONE===