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--TEST--
Test usort() function : usage variations - use built in functions as $cmp_function arg
--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
*/
/*
* Test usort() when comparison function is:
* 1. a built in comparison function
* 2. a language construct
*/
echo "*** Testing usort() : usage variation ***\n";
// Initializing variables
$array_arg = array("b" => "Banana", "m" => "Mango", "a" => "apple",
"p" => "Pineapple", "o" => "orange");
// Testing library functions as comparison function
echo "\n-- Testing usort() with built-in 'cmp_function': strcasecmp() --\n";
$temp_array1 = $array_arg;
var_dump( usort($temp_array1, 'strcasecmp') );
var_dump($temp_array1);
echo "\n-- Testing usort() with built-in 'cmp_function': strcmp() --\n";
$temp_array2 = $array_arg;
var_dump( usort($temp_array2, 'strcmp') );
var_dump($temp_array2);
// Testing with language construct as comparison function
echo "\n-- Testing usort() with language construct as 'cmp_function' --\n";
$temp_array3 = $array_arg;
var_dump( usort($temp_array3, 'echo') );
echo "\n-- Testing usort() with language construct as 'cmp_function' --\n";
$temp_array4 = $array_arg;
var_dump( usort($temp_array4, 'exit') );
?>
===DONE===
--EXPECTF--
*** Testing usort() : usage variation ***
-- Testing usort() with built-in 'cmp_function': strcasecmp() --
bool(true)
array(5) {
[0]=>
string(5) "apple"
[1]=>
string(6) "Banana"
[2]=>
string(5) "Mango"
[3]=>
string(6) "orange"
[4]=>
string(9) "Pineapple"
}
-- Testing usort() with built-in 'cmp_function': strcmp() --
bool(true)
array(5) {
[0]=>
string(6) "Banana"
[1]=>
string(5) "Mango"
[2]=>
string(9) "Pineapple"
[3]=>
string(5) "apple"
[4]=>
string(6) "orange"
}
-- Testing usort() with language construct as 'cmp_function' --
Warning: usort() expects parameter 2 to be a valid callback, function 'echo' not found or invalid function name in %s on line %d
NULL
-- Testing usort() with language construct as 'cmp_function' --
Warning: usort() expects parameter 2 to be a valid callback, function 'exit' not found or invalid function name in %s on line %d
NULL
===DONE===
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