3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function doFoo(){ echo 'hi!'; } $callable = 'doFoo'; var_dump( is_callable( $callable ) ); var_dump( is_string( $callable ) ); function doBar( callable $cb ){ $callable(); } doBar( $callable );
Output for 7.0.0 - 7.1.0
bool(true) bool(true) Notice: Undefined variable: callable in /in/la0ua on line 10 Fatal error: Uncaught Error: Function name must be a string in /in/la0ua:10 Stack trace: #0 /in/la0ua(13): doBar('doFoo') #1 {main} thrown in /in/la0ua on line 10
Process exited with code 255.
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0
bool(true) bool(true) Notice: Undefined variable: callable in /in/la0ua on line 10 Fatal error: Function name must be a string in /in/la0ua on line 10
Process exited with code 255.
Output for 5.2.0 - 5.3.29
bool(true) bool(true) Catchable fatal error: Argument 1 passed to doBar() must be an instance of callable, string given, called in /in/la0ua on line 13 and defined in /in/la0ua on line 9
Process exited with code 255.
Output for 5.1.0 - 5.1.6
bool(true) bool(true) Fatal error: Argument 1 passed to doBar() must be an object of class callable, called in /in/la0ua on line 13 and defined in /in/la0ua on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5
bool(true) bool(true) Fatal error: Argument 1 must be an object of class callable in /in/la0ua on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/la0ua on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/la0ua on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/la0ua on line 9
Process exited with code 255.