You should mention the label can't be a variablegoto
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
此漫画鸣谢 » xkcd
goto
操作符可以用来跳转到程序中的另一位置。该目标位置可以用 区分大小写 的目标名称加上冒号来标记，而跳转指令是
goto 之后接上目标位置的标记。PHP 中的 goto
有一定限制，目标位置只能位于同一个文件和作用域，也就是说无法跳出一个函数或类方法，也无法跳入到另一个函数。也无法跳入到任何循环或者
switch 结构中。可以跳出循环或者 switch，通常的用法是用 goto
代替多层的 break。
示例 #1 goto 示例
<?php
goto a;
echo 'Foo';
a:
echo 'Bar';
?>以上示例会输出：
Bar
示例 #2 goto 跳出循环示例
<?php
for ($i = 0, $j = 50; $i < 100; $i++) {
while ($j--) {
if ($j == 17) {
goto end;
}
}
}
echo "i = $i";
end:
echo 'j hit 17';
?>以上示例会输出：
j hit 17
示例 #3 以下写法无效
<?php
goto loop;
for ($i = 0, $j = 50; $i < 100; $i++) {
while ($j--) {
loop:
}
}
echo "$i = $i";
?>以上示例会输出：
Fatal error: 'goto' into loop or switch statement is disallowed in script on line 2
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User Contributed Notes 5 notes
devbyjesus at example dot com ¶
2 years ago
the problem of goto is that it is a good feature but in a large codebase it reduces the readability of the code . that's all . i try to not use it to think about the person who is going to read after me .
BPI ¶
1 year ago
You can jump inside the same switch. This can be usefull to jump to default
<?php
$x=3;
switch($x){
case 0:
case 3:
print($x);
if($x)
goto def;
case 5:
$x=6;
default:
def:
print($x);
}
?>
georgy dot moshkin at techsponsor dot io ¶
4 days ago
You can use goto to hide large HTML blocks without using echo():
<html><body>
<?php if ($hide_form_and_script) { goto label_1;} ?>
<form action="" method="post">
<!-- some HTML here -->
</form>
<script>
let a='test'; // no need to escape nested quotes as with echo()
// some JavaScript here
</script>
<?php label_1: ?>
</body></html>