PHP Manual PHP at the Core: A Hacker's Guide Zend Engine 2 Opcodes Opcode Descriptions and Examples ECHO DO_FCALL_BY_NAME END_SILENCE ECHO PHP code <?php/* * Dump text * opcode number: 40 */echo "hello world";?> PHP opcodes Function name: (null) Compiled variables: none line#op fetchextreturn operands 60 ECHO 'hello+world' 71 RETURN 1