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<?php $arr = array( 'a' => 'A', 'b' => 'B', 'c' => 'C'); var_dump($arr); // Taking "$val" as a reference here allows modifying the parent hashtable // directly, i.e. the $val ref "knows" its parent key in some sense foreach ($arr as &$val) { if ($val == 'B') { $val = 'X'; } } var_dump($arr); // However, it doesn't allow you to unset the parent key... foreach ($arr as &$val) { if ($val == 'B') { unset($val); } } var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "B" ["c"]=> string(1) "C" } array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "X" ["c"]=> &string(1) "C" } array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "X" ["c"]=> &string(1) "C" }

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