PHP 5.3 gets GOTO operator

PHP 5.3 gets GOTO operator Hot

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Written by www.php.net

Thursday, 02 July 2009

The PHP development team is proud to announce the immediate release of PHP5.3.0. This release is a major improvement in the 5.X series, which includes a large number of new features and bug fixes.

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 asgoto 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.

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