PHP手册 - CATCH

CATCH

PHP code


<?php
/*
 * 
 * opcode number: 107
 */
try {
    $error = 'Always throw this error';
    throw new Exception($error);

    // Code following an exception is not executed.
    echo 'Never executed';

} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

// Continue execution
echo 'Hello World';
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$error, !1=$e

line	#	op	ext	return	operands
7	0	ASSIGN			!0,'Always+throw+this+error'
8	1	ZEND_FETCH_CLASS		:1	'Exception'
	2	NEW		$2	:1
	3	SEND_VAR			!0
	4	DO_FCALL_BY_NAME	1
	5	ZEND_THROW	0		$2
11	6	ECHO			'Never+executed'
13	7	JMP			->15
	8	ZEND_FETCH_CLASS		:4	'Exception'
	9	ZEND_CATCH	15		$4,!1
14	10	ECHO			'Caught+exception%3A+'
	11	ZEND_INIT_METHOD_CALL			!1,'getMessage'
	12	DO_FCALL_BY_NAME	0
	13	ECHO			$6
	14	ECHO			'%0A'
18	15	ECHO			'Hello+World'
19	16	RETURN			1