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Bug #76793 While loop condition causes infinite execution
Submitted: 2018-08-25 15:43 UTC Modified: 2018-08-25 15:48 UTC
From: aimnexus12 at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.1.21 OS: Windows NT 6.2 build 9200
Private report: No CVE-ID: None
 [2018-08-25 15:43 UTC] aimnexus12 at gmail dot com
Description:
------------
Changing the order of execution for the condition variable will cause the while loop to execute forever

Test script:
---------------
$index = 0;
$max = 10;

while($index <= $max) {
    if($index == 5) {
        continue;
    }
    
    echo "step: {$index} / {$max} \r\n";
    $index++;
}


Expected result:
----------------
step: 0 / 10
step: 1 / 10 
step: 2 / 10 
step: 3 / 10 
step: 4 / 10 
step: 6 / 10 
step: 7 / 10 
step: 8 / 10 
step: 9 / 10 
step: 10 / 10 

Actual result:
--------------
Script execution is terminated due to hitting the 30 seconds execution limit

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 [2018-08-25 15:48 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2018-08-25 15:48 UTC] requinix@php.net
10  IF $index == 5 THEN GOTO 10
 [2018-08-25 15:49 UTC] fractalesque at gmail dot com
How do you expect the script to ever increment the index if it skips every time forever?

Eg, when doing the check, it will continue. On next loop it will still be 5, and continue. On next loop it will still be 5, and continue. On next loop it will still be 5, and continue. On next loop it will still be 5, and continue. On next loop it will still be 5, and continue. On next loop it will still be 5, and continue. 

you get the idea.
 
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