Php/docs/internals2.opcodes.instanceof

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INSTANCEOF

PHP code

<?php/* *  * opcode number: 138 */$obj = new A();if ($obj instanceof A) {   echo 'A';}?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$obj

line # op fetch ext return operands
6 0 ZEND_FETCH_CLASS     :0 'A'
  1 NEW     $1 :0
  2 DO_FCALL_BY_NAME   0    
  3 ASSIGN       !0,$1
8 4 ZEND_FETCH_CLASS     :4 'A'
  5 ZEND_INSTANCEOF     ~5 !0,$4
  6 JMPZ       ~5,->9
9 7 ECHO       'A'
10 8 JMP       ->9
11 9 RETURN       1