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1.1     ! misho       1: --TEST--
        !             2: Test array_flip() function : basic functionality 
        !             3: --FILE--
        !             4: <?php
        !             5: /* Prototype  : array array_flip(array $input)
        !             6:  * Description: Return array with key <-> value flipped 
        !             7:  * Source code: ext/standard/array.c
        !             8: */
        !             9: 
        !            10: echo "*** Testing array_flip() : basic functionality ***\n";
        !            11: 
        !            12: // array with default keys - numeric values
        !            13: $input = array(1, 2);   
        !            14: var_dump( array_flip($input) );
        !            15: 
        !            16: // array with default keys - string values
        !            17: $input = array('value1', "value2");
        !            18: var_dump( array_flip($input) );
        !            19: 
        !            20: // associative arrays - key as string
        !            21: $input = array('key1' => 1, "key2" => 2); 
        !            22: var_dump( array_flip($input) );
        !            23: 
        !            24: // associative arrays - key as numeric
        !            25: $input = array(1 => 'one', 2 => "two");
        !            26: var_dump( array_flip($input) );
        !            27: 
        !            28: // combination of associative and non-associative array
        !            29: $input = array(1 => 'one','two', 3 => 'three', 4, "five" => 5);
        !            30: var_dump( array_flip($input) );
        !            31: echo "Done"
        !            32: ?>
        !            33: --EXPECTF--
        !            34: *** Testing array_flip() : basic functionality ***
        !            35: array(2) {
        !            36:   [1]=>
        !            37:   int(0)
        !            38:   [2]=>
        !            39:   int(1)
        !            40: }
        !            41: array(2) {
        !            42:   ["value1"]=>
        !            43:   int(0)
        !            44:   ["value2"]=>
        !            45:   int(1)
        !            46: }
        !            47: array(2) {
        !            48:   [1]=>
        !            49:   string(4) "key1"
        !            50:   [2]=>
        !            51:   string(4) "key2"
        !            52: }
        !            53: array(2) {
        !            54:   ["one"]=>
        !            55:   int(1)
        !            56:   ["two"]=>
        !            57:   int(2)
        !            58: }
        !            59: array(5) {
        !            60:   ["one"]=>
        !            61:   int(1)
        !            62:   ["two"]=>
        !            63:   int(2)
        !            64:   ["three"]=>
        !            65:   int(3)
        !            66:   [4]=>
        !            67:   int(4)
        !            68:   [5]=>
        !            69:   string(4) "five"
        !            70: }
        !            71: Done