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<?php // Create function with the name defined in variable $functionName function MyFunction($argument) { return 'Argument passed is: '.$argument; } $functionName = 'MyFunction'; var_dump(MyFunction('Calling MyFunction directly.')); var_dump($functionName('Calling MyFunction with string.'));
Output for 4.3.0 - 5.3.20, 5.3.22 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(48) "Argument passed is: Calling MyFunction directly." string(51) "Argument passed is: Calling MyFunction with string."
Output for 5.3.21

Process exited with code 137.