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php5.3 goto函数介绍和示例_php实例

Jun 07, 2016 pm 05:21 PM

goto操作符是PHP5.3+后新增功能,用来跳转到程序的另一位置;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 '脚本之家';
a:
    echo 'http://www.php.net';

但是goto的目标位置只能同一文件和作用域【既不能跳转到一个函数和类方法中】,当然它可以跳出循环,但是不能跳入循环:

复制代码 代码如下:

for($i = 0; $i {
    echo $i . '
';
    if($i == 1) goto end;
}
end :
    echo '直接end结束了';

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。

复制代码 代码如下:

goto a;
echo 'Foo';

a:
echo 'Bar';
?>

以上例程会输出: Bar

goto 跳出循环示例

复制代码 代码如下:

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

以上例程会输出: j hit 17

以下写法无效

复制代码 代码如下:

goto loop;
for($i=0,$j=50; $i  while($j--) {
    loop:
  }
}
echo "$i = $i";
?>

以上例程会输出:

 Fatal error: 'goto' into loop or switch statement is disallowed in
script on line 2

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