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run code in 200+ php & hhvm versions
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<?php $test = []; $test["12345"] = 'hello'; $test["abcde"] = 'goodbye'; //$test = array_merge($test, []); $test = $test + ["12345" => 'another string']; var_dump($test);
based on GDjLr
Output for 5.4.0 - 7.2.0
array(2) { [12345]=> string(5) "hello" ["abcde"]=> string(7) "goodbye" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/hY0OL on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/hY0OL on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/hY0OL on line 5
Process exited with code 255.