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<?php function doSomething($string) { $string[0] = strtolower($string[0]); $func = create_function('$c', 'return "_" . strtolower($c[1]);'); return preg_replace_callback('/([A-Z])/', $func, $string); } echo doSomething('DAVID');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Call to undefined function create_function() in /in/jVH4c:4 Stack trace: #0 /in/jVH4c(8): doSomething('dAVID') #1 {main} thrown in /in/jVH4c on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: Function create_function() is deprecated in /in/jVH4c on line 4 d_a_v_i_d
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.3.32 - 7.3.33
d_a_v_i_d

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