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PHP goto语句简介和使用实例

Jun 13, 2016 am 09:41 AM
goto php

goto操作符可以用来跳转到程序中的某一指定位置。该目标位置可以用目标名称加上冒号来标记。PHP中的goto有一定限制,只能在同一个文件和作用域中跳转,也就是说你无法跳出一个函数或类方法,也无法跳入到另一个函数。你也无法跳入到任何循环或者switch 结构中。常见的用法是用来跳出循环或者switch,可以代替多层的break。

用法很简单:goto后面带上目标位置的标志,在目标位置上用目标名加冒号标记,如下:

复制代码 代码如下:

goto a;
echo 'Foo';//此句被略过

a:
echo 'Bar';

//上面的例子输出结果为: Bar;

for($i=0,$j=50; $i  while($j--) {
    if($j==17) goto end;
  } 
}
echo "i = $i";
end:
echo 'j hit 17';

//上面的例子输出结果为: j hit 17
?>


Note:
The goto 操作符仅在 PHP 5.3及以上版本有效.

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