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PHP

goto


goto

(PHP 5 >= 5.3.0)

The goto operator can be used to jump to another section in the program. The target point is specified by a 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 

Note:

The goto operator is available as of PHP 5.3.

what's the worse thing that could happen if you use goto?
Image courtesy of » xkcd



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