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<?php function X( $func ) { foreach ( [1,2,3,4,5] as $key => $number ) call_user_func( $func, $key, $number ); } X( function() { echo $key, $number; } );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $key in /in/hsmOL on line 10 Warning: Undefined variable $number in /in/hsmOL on line 10 Warning: Undefined variable $key in /in/hsmOL on line 10 Warning: Undefined variable $number in /in/hsmOL on line 10 Warning: Undefined variable $key in /in/hsmOL on line 10 Warning: Undefined variable $number in /in/hsmOL on line 10 Warning: Undefined variable $key in /in/hsmOL on line 10 Warning: Undefined variable $number in /in/hsmOL on line 10 Warning: Undefined variable $key in /in/hsmOL on line 10 Warning: Undefined variable $number in /in/hsmOL on line 10

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