3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a () { function b() { echo "I am ".__FUNCTION__."\n"; } echo "I am ".__FUNCTION__."\n"; } echo function_exists("b") ? "b is defined\n" : "b is not defined\n"; a(); echo function_exists("b") ? "b is defined\n" : "b is not defined\n"; b(); a(); echo function_exists("b") ? "b is defined\n" : "b is not defined\n";
based on Nneog
Output for 4.3.2 - 5.6.28, 7.0.0 - 7.1.0
b is not defined I am a b is defined I am b Fatal error: Cannot redeclare b() (previously declared in /in/uGOVP:5) in /in/uGOVP on line 4
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
b is not defined I am a b is defined I am b I am a b is defined
Output for 4.3.0 - 4.3.1
b is not defined I am a b is defined I am b Fatal error: Cannot redeclare b() (previously declared in /in/uGOVP:5) in /in/uGOVP on line 4