php5.3 Goto Function Introduction and Example _php instance

The goto operator is a new feature added after php5.3+ to jump to another location in the program; the usage is simple: goto followed by a flag with the target location, with a colon marked at the destination, as follows:

Copy Code code as follows:

Goto A;
Echo ' cloud-dwelling community ';
A:
Echo ' http://www.jb51.net ';

But Goto destination can only be the same file and scope "can not jump to a function and class method", of course, it can jump out of the loop, but can not jump into the loop:

Copy Code code as follows:

<?php
for ($i = 0; $i < 3; $i + +)
{
Echo $i. ' <br> ';
if ($i = = 1) goto end;
}
End:
Echo ' Straight end ';

The goto operator can be used to jump to a specified position in a program. The target location can be marked with a colon for the target name. The Goto in PHP has a certain limit and can only jump in the same file and scope, which means you can't jump out of a function or class method, and you can't skip to another function. You also can't jump into any loops or switch structures. A common use is to jump out of loops or switch, instead of multiple layers of break.

Copy Code code as follows:

<?php
Goto A;
Echo ' Foo ';

A:
Echo ' Bar ';
?>

The above routine will output: Bar

Goto Jump Out Loop Example

Copy Code code as follows:

<?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 routine will output: J hit 17

The following wording is not valid

Copy Code code as follows:

<?php
Goto Loop;
For ($i =0, $j =50 $i <100; $i + +) {
while ($j-) {
Loop
}
}
echo "$i = $i";
?>

The above routines will output:

Fatal error: ' Goto ' into loop or switch statement are disallowed in
Script on line 2