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1.1       misho       1: --TEST--
                      2: Test array_filter() function : basic functionality 
                      3: --FILE--
                      4: <?php
                      5: /* Prototype  : array array_filter(array $input [, callback $callback])
                      6:  * Description: Filters elements from the array via the callback. 
                      7:  * Source code: ext/standard/array.c
                      8: */
                      9: 
                     10: 
                     11: echo "*** Testing array_filter() : basic functionality ***\n";
                     12: 
                     13: 
                     14: // Initialise all required variables
                     15: $input = array(1, 2, 3, 0, -1);  // 0 will be considered as FALSE and removed in default callback
                     16: 
                     17: /* Callback function
                     18:  * Prototype : bool even(array $input)
                     19:  * Parameters : $input - input array each element of which will be checked in function even()
                     20:  * Return type : boolean - true if element is even and false otherwise
                     21:  * Description : This function takes array as parameter and checks for each element of array.
                     22:  *              It returns true if the element is even number else returns false
                     23:  */
                     24: function even($input)
                     25: {
                     26:   return ($input % 2 == 0);
                     27: }
                     28: 
                     29: // with all possible arguments
                     30: var_dump( array_filter($input,"even") );
                     31: 
                     32: // with default arguments
                     33: var_dump( array_filter($input) );
                     34: 
                     35: echo "Done"
                     36: ?>
                     37: --EXPECTF--
                     38: *** Testing array_filter() : basic functionality ***
                     39: array(2) {
                     40:   [1]=>
                     41:   int(2)
                     42:   [3]=>
                     43:   int(0)
                     44: }
                     45: array(4) {
                     46:   [0]=>
                     47:   int(1)
                     48:   [1]=>
                     49:   int(2)
                     50:   [2]=>
                     51:   int(3)
                     52:   [4]=>
                     53:   int(-1)
                     54: }
                     55: Done