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<?php $foo = array( "a" => 1, "b" => 2, "c" => 3, "d" => 4, ); $foo = ['c' => $foo['c']] + $foo; var_export($foo); echo "\n---\n"; $bar = array( "a" => 1, "b" => 2, "d" => 4, ); if (array_key_exists('c', $bar)) { $bar = ['c' => $bar['c']] + $bar; } var_export($bar);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'c' => 3, 'a' => 1, 'b' => 2, 'd' => 4, ) --- array ( 'a' => 1, 'b' => 2, 'd' => 4, )

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