Introduction and examples of php5.3 goto function_PHP tutorial

The goto operator is a new function after PHP5.3+, which is used to jump to another location in the program; its usage is very simple: put the mark of the target location after goto, and mark the target location with the target name plus a colon. , as follows:

Copy code The code is as follows:

goto a;
echo 'Script Home';
a:
echo 'http://www.jb51.net';

But the target location of goto can only be the same file and scope [it cannot jump to a function or class method]. Of course, it can jump out of the loop, but it cannot jump into the loop:

Copy code The code is as follows:

for($i = 0; $i < 3; $i++)
{
echo $i . '
';
if($i == 1) goto end;
}
end :
echo 'End directly';

The goto operator can be used to jump to a specified location in the program. The target location can be marked with the target name followed by a colon. Goto in PHP has certain restrictions and can only jump within the same file and scope. This means that you cannot jump out of a function or class method, nor can you jump into another function. You also cannot jump into any loops or switch structures. Common usage is to break out of a loop or switch, which can replace multiple levels of break.

Copy code The code is as follows:

goto a;
echo 'Foo';

a:
echo 'Bar';
?>

The above routine will output: Bar

goto jump out of loop example

Copy code The code is as follows:

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 writing is invalid

Copy code The code is as follows:

goto loop;
for($i=0,$j=50; $i<100; $i++) {
while($j--) {
loop:
}
}
echo "$i = $i";
?>

The above routine will output:

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

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