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<?php $test = [ 'Hello 123', 'walala7', 'HoHo HoHo', 'FOO bar' ]; var_dump(array_map(function($item) { return str_replace(' ', '_', strtolower($item)); } , $test));
based on rLmag
Output for 5.4.0 - 7.1.0
array(4) { [0]=> string(9) "hello_123" [1]=> string(7) "walala7" [2]=> string(9) "hoho_hoho" [3]=> string(7) "foo_bar" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ILK8h on line 3
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/ILK8h on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/ILK8h on line 3
Process exited with code 255.