ZEND_ADD_STRING   987 Zend/zend_compile.c 		opline->opcode = ZEND_ADD_STRING;
ZEND_ADD_STRING  1023 Zend/zend_compile.c 			opline->opcode = ZEND_ADD_STRING;
ZEND_ADD_STRING  1636 Zend/zend_vm_def.h ZEND_VM_HANDLER(55, ZEND_ADD_STRING, TMP, CONST)