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1.1     ! misho       1: --TEST--
        !             2: Test array_shift() function : usage variations - maintaining referenced elements
        !             3: --FILE--
        !             4: <?php
        !             5: /* Prototype  : mixed array_shift(array &$stack)
        !             6:  * Description: Pops an element off the beginning of the array 
        !             7:  * Source code: ext/standard/array.c
        !             8:  */
        !             9: 
        !            10: /*
        !            11:  * From a comment left by Traps on 09-Jul-2007 on the array_shift documentation page:
        !            12:  * For those that may be trying to use array_shift() with an array containing references 
        !            13:  * (e.g. working with linked node trees), beware that array_shift() may not work as you expect: 
        !            14:  * it will return a *copy* of the first element of the array, 
        !            15:  * and not the element itself, so your reference will be lost.
        !            16:  * The solution is to reference the first element before removing it with array_shift():
        !            17:  */
        !            18: 
        !            19: echo "*** Testing array_shift() : usage variations ***\n";
        !            20: 
        !            21: // using only array_shift:
        !            22: echo "\n-- Reference result of array_shift: --\n";
        !            23: $a = 1;
        !            24: $array = array(&$a);
        !            25: $b =& array_shift($array);
        !            26: $b = 2;
        !            27: echo "a = $a, b = $b\n";
        !            28: 
        !            29: // solution: referencing the first element first:
        !            30: echo "\n-- Reference first element before array_shift: --\n";
        !            31: $a = 1;
        !            32: $array = array(&$a);
        !            33: $b =& $array[0];
        !            34: array_shift($array);
        !            35: $b = 2;
        !            36: echo "a = $a, b = $b\n";
        !            37: 
        !            38: echo "Done";
        !            39: ?>
        !            40: --EXPECTF--
        !            41: *** Testing array_shift() : usage variations ***
        !            42: 
        !            43: -- Reference result of array_shift: --
        !            44: 
        !            45: Strict Standards: Only variables should be assigned by reference in %s on line %d
        !            46: a = 1, b = 2
        !            47: 
        !            48: -- Reference first element before array_shift: --
        !            49: a = 2, b = 2
        !            50: Done