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--TEST--
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Bug #39036 (Unsetting key of foreach() yields segmentation fault)
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--FILE--
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<?php
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$key = 'asdf';
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foreach (get_defined_vars() as $key => $value) {
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unset($$key);
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}
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var_dump($key);
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echo "Done\n";
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?>
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--EXPECTF--
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Warning: Undefined variable $key in %s on line %d
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NULL
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Done
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