note 98056 deleted from control-structures.goto by danbrown
| From: | danbrown@php.net | Date: | Mon, 24 May 2010 01:00:35 +0000 |
| Subject: | note 98056 deleted from control-structures.goto by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-169538@lists.php.net to get a copy of this message | ||
Note Submitter: edgar dot klerks at gmail dot com
----
Better not use it, it has to power to make your code unstructured. To illustrate this danger, I made
an especially bad example of using gotos.
<?php
/* Fibonaci and goto */
start:
print "Please give a number:";
$n = (int)fgets(STDIN) - 1;
if(!isset($x))
$x = array(1,1);
$last = $i = 0;
$back = 'nextstep';
goto fib;
nextstep:
$t = 0;
$sum = 0;
sum:
print_r($x) ."\n";
if($t > $n){
goto result;
}
$sum += $x[$t];
$t++;
goto sum;
result:
print "The sum is: " . $sum . "\n";
goto start;
jmpspot:
switch($back){
case 'nextstep':
goto nextstep;
break;
default:
goto start;
}
fib:
if($last > $n){
$i = $n;
goto jmpspot;
}
if(!isset($x[$i]))
$x[$i] = $x[$i - 1] + $x[$i - 2];
if($i > $n)
goto jmpspot;
$last = $i;
$i++;
goto fib;
?>