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1.1       misho       1: --TEST--
                      2: Test usort() function : usage variations - use built in functions as $cmp_function arg
                      3: --FILE--
                      4: <?php
                      5: /* Prototype  : bool usort(array $array_arg, string $cmp_function)
                      6:  * Description: Sort an array by values using a user-defined comparison function 
                      7:  * Source code: ext/standard/array.c
                      8:  */
                      9: 
                     10: /*
                     11:  * Test usort() when comparison function is:
                     12:  * 1. a built in comparison function
                     13:  * 2. a language construct
                     14:  */
                     15: 
                     16: echo "*** Testing usort() : usage variation ***\n";
                     17: 
                     18: // Initializing variables
                     19: $array_arg = array("b" => "Banana", "m" => "Mango", "a" => "apple", 
                     20:                    "p" => "Pineapple", "o" => "orange");
                     21: 
                     22: // Testing library functions as comparison function 
                     23: echo "\n-- Testing usort() with built-in 'cmp_function': strcasecmp() --\n";
                     24: $temp_array1 = $array_arg;
                     25: var_dump( usort($temp_array1, 'strcasecmp') );
                     26: var_dump($temp_array1);
                     27: 
                     28: echo "\n-- Testing usort() with built-in 'cmp_function': strcmp() --\n";
                     29: $temp_array2 = $array_arg;
                     30: var_dump( usort($temp_array2, 'strcmp') );
                     31: var_dump($temp_array2);
                     32: 
                     33: // Testing with language construct as comparison function
                     34: echo "\n-- Testing usort() with language construct as 'cmp_function' --\n";
                     35: $temp_array3 = $array_arg;
                     36: var_dump( usort($temp_array3, 'echo') );
                     37: 
                     38: echo "\n-- Testing usort() with language construct as 'cmp_function' --\n";
                     39: $temp_array4 = $array_arg;
                     40: var_dump( usort($temp_array4, 'exit') );
                     41: ?>
                     42: ===DONE===
                     43: --EXPECTF--
                     44: *** Testing usort() : usage variation ***
                     45: 
                     46: -- Testing usort() with built-in 'cmp_function': strcasecmp() --
                     47: bool(true)
                     48: array(5) {
                     49:   [0]=>
                     50:   string(5) "apple"
                     51:   [1]=>
                     52:   string(6) "Banana"
                     53:   [2]=>
                     54:   string(5) "Mango"
                     55:   [3]=>
                     56:   string(6) "orange"
                     57:   [4]=>
                     58:   string(9) "Pineapple"
                     59: }
                     60: 
                     61: -- Testing usort() with built-in 'cmp_function': strcmp() --
                     62: bool(true)
                     63: array(5) {
                     64:   [0]=>
                     65:   string(6) "Banana"
                     66:   [1]=>
                     67:   string(5) "Mango"
                     68:   [2]=>
                     69:   string(9) "Pineapple"
                     70:   [3]=>
                     71:   string(5) "apple"
                     72:   [4]=>
                     73:   string(6) "orange"
                     74: }
                     75: 
                     76: -- Testing usort() with language construct as 'cmp_function' --
                     77: 
                     78: Warning: usort() expects parameter 2 to be a valid callback, function 'echo' not found or invalid function name in %s on line %d
                     79: NULL
                     80: 
                     81: -- Testing usort() with language construct as 'cmp_function' --
                     82: 
                     83: Warning: usort() expects parameter 2 to be a valid callback, function 'exit' not found or invalid function name in %s on line %d
                     84: NULL
                     85: ===DONE===