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<?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 git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) Warning: Undefined variable $callable in /in/la0ua on line 10 Fatal error: Uncaught Error: Value of type null is not callable 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.

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