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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();
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) Fatal error: Uncaught ArgumentCountError: Too few arguments to function doBar(), 0 passed in /in/1ictA on line 13 and exactly 1 expected in /in/1ictA:9 Stack trace: #0 /in/1ictA(13): doBar() #1 {main} thrown in /in/1ictA on line 9
Process exited with code 255.

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