3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a () { function b() { echo "I am b.\n"; } echo "I am a.\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();
based on mXlvY
Output for 4.3.0 - 7.1.0
b is not defined I am a. b is defined I am b.