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<?php $a = ['A', 'aasBABA', 'AFJ837A', 'A_B', 'abc']; var_dump(preg_filter('/^[A-Z_]+$/', '$0', $a));
based on eRT8D
Output for 5.4.0 - 7.2.0
array(2) { [0]=> string(1) "A" [3]=> string(3) "A_B" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/pNfTG 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/pNfTG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pNfTG on line 3
Process exited with code 255.