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<?php $previous = NULL; function call() { var_dump( __FUNCTION__ ); } set_error_handler( 'call' ); trigger_error( 'some message 1', E_USER_NOTICE ); $previous = set_error_handler( function() use( $previous ) { // note that previous is null, because of association sequence var_dump( __FUNCTION__ ); } ); trigger_error( 'some message 2', E_USER_NOTICE ); var_dump( set_error_handler( NULL ) ); trigger_error( 'some message 3', E_USER_NOTICE );
Output for git.master, git.master_jit, rfc.property-hooks
string(4) "call" string(9) "{closure}" object(Closure)#1 (1) { ["static"]=> array(1) { ["previous"]=> NULL } } Notice: some message 3 in /in/vmGgL on line 14

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