3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo preg_replace("/(?!^)(?=[A-Z])/", "_", "FooBarAoo"); echo strtolower(preg_replace('/([A-Z])/', '_$1', lcfirst($str)));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Foo_Bar_Aoo Notice: Undefined variable: str in /in/Cqtch on line 4
Output for 5.0.0 - 5.2.17
Foo_Bar_Aoo Fatal error: Call to undefined function lcfirst() in /in/Cqtch on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Foo_Bar_Aoo Fatal error: Call to undefined function: lcfirst() in /in/Cqtch on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Foo_Bar_Aoo Fatal error: Call to undefined function: lcfirst() in /in/Cqtch on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Foo_Bar_Aoo Fatal error: Call to undefined function: lcfirst() in /in/Cqtch on line 4