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50 lines
1.4 KiB
PHP
50 lines
1.4 KiB
PHP
--TEST--
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Test array_shift() function : usage variations - maintaining referenced elements
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--FILE--
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<?php
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/* Prototype : mixed array_shift(array &$stack)
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* Description: Pops an element off the beginning of the array
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* Source code: ext/standard/array.c
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*/
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/*
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* From a comment left by Traps on 09-Jul-2007 on the array_shift documentation page:
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* For those that may be trying to use array_shift() with an array containing references
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* (e.g. working with linked node trees), beware that array_shift() may not work as you expect:
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* it will return a *copy* of the first element of the array,
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* and not the element itself, so your reference will be lost.
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* The solution is to reference the first element before removing it with array_shift():
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*/
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echo "*** Testing array_shift() : usage variations ***\n";
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// using only array_shift:
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echo "\n-- Reference result of array_shift: --\n";
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$a = 1;
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$array = array(&$a);
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$b =& array_shift($array);
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$b = 2;
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echo "a = $a, b = $b\n";
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// solution: referencing the first element first:
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echo "\n-- Reference first element before array_shift: --\n";
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$a = 1;
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$array = array(&$a);
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$b =& $array[0];
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array_shift($array);
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$b = 2;
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echo "a = $a, b = $b\n";
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echo "Done";
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?>
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--EXPECTF--
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*** Testing array_shift() : usage variations ***
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-- Reference result of array_shift: --
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Strict Standards: Only variables should be assigned by reference in %s on line %d
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a = 1, b = 2
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-- Reference first element before array_shift: --
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a = 2, b = 2
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Done
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