You should mention the label can't be a variablegoto
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
Image courtesy of » xkcd
The goto operator can be used to jump to another
section in the program. The target point is specified by a case-sensitive label
followed by a colon, and the instruction is given as
goto followed by the desired target label. This
is not a full unrestricted goto. The target
label must be within the same file and context, meaning that you cannot jump
out of a function or method, nor can you jump into one. You also
cannot jump into any sort of loop or switch structure. You may jump
out of these, and a common use is to use a goto
in place of a multi-level break.
Example #1 goto example
<?php
goto a;
echo 'Foo';
a:
echo 'Bar';
?>The above example will output:
Bar
Example #2 goto loop example
<?php
for ($i = 0, $j = 50; $i < 100; $i++) {
while ($j--) {
if ($j == 17) {
goto end;
}
}
}
echo "i = $i";
end:
echo 'j hit 17';
?>The above example will output:
j hit 17
Example #3 This will not work
<?php
goto loop;
for ($i = 0, $j = 50; $i < 100; $i++) {
while ($j--) {
loop:
}
}
echo "$i = $i";
?>The above example will output:
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 ¶
21 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>