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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