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