RAISE_ABSTRACT_ERROR

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PHP code

  <?php
 

 abstract class  fail  {
    abstract function  show ();
}

class  pass  extends  fail  {
    function  show () {
        echo  "Call to function show()\n" ;
    }
}

 $t2  = new  pass ();
 $t2 -> show ();

 $t  = new  fail ();
 $t -> show ();

echo  "Done\n" ;  // shouldn't be displayed
 ?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$t2, !1=$t

line	#	op	ext	return	operands
7	0	NOP
11	1	NOP
	2	NOP
17	3	ZEND_FETCH_CLASS		:3	'pass'
	4	NEW		$4	:3
	5	DO_FCALL_BY_NAME	0
	6	ASSIGN			!0,$4
18	7	ZEND_INIT_METHOD_CALL			!0,'show'
	8	DO_FCALL_BY_NAME	0
20	9	ZEND_FETCH_CLASS		:9	'fail'
	10	NEW		$10	:9
	11	DO_FCALL_BY_NAME	0
	12	ASSIGN			!1,$10
21	13	ZEND_INIT_METHOD_CALL			!1,'show'
	14	DO_FCALL_BY_NAME	0
23	15	ECHO			'Done%0A'
24	16	RETURN			1

Function name: show

Compiled variables: none

line	#	op	fetch	ext	return	operands
8	0	ZEND_RAISE_ABSTRACT_ERROR
	1	RETURN				null

Function name: show

Compiled variables: none

line	#	op	fetch	ext	return	operands
13	0	ECHO				'Call+to+function+show%28%29%0A'
14	1	RETURN				null