Undefined Offset help

[rezyn8]

Hi All

I am having trouble with an API for TPP when checking for domain availability, I get the following error in apache2 logs. The script wasn't written by me and is several years old.

[Mon Jan 23 09:01:27 2012] [error] [client 123.45.67.89] PHP Notice: Undefined offset: 0 in /site/root/availability.php on line 169
[Mon Jan 23 09:01:27 2012] [error] [client 123.45.67.89] PHP Notice: Undefined offset: 1 in /site/root/availability.php on line 169
[Mon Jan 23 09:01:27 2012] [error] [client 123.45.67.89] PHP Notice: Undefined offset: 2 in /site/root/availability.php on line 169

The error refers to this section of the below function:

    $t = 0;
    while($t < 3) {
        ltrim($availabilityString[$t]);
        $availabilityString[$t] = substr($availabilityString[$t], 2);
        $t++;
    } 

The function causing the issue:

function outputResults($output) {
    $i = 0;
    $counter = 0;
    $length = intval(strlen($output));
    $availabilityString = array();
    $available = array();
    $notAvailable = array();
    $failure = array();
    $headingArray = array('Available Domains','Taken Domains','Failed Domain Checks');

    while($counter < 3)    { 
        $x = 0;
        
        if($counter == 0) {
            while($output[$i] != '<') {    
                if($output[$i] == ':') {
                    $x = 1;
//                        $i = $i + 2;
                }
                
                if($x == 1)    {
                    $availabilityString[$counter] = $availabilityString[$counter] . $output[$i];        
                }
                $i++;
            }
        } else if($counter == 1) {
            while($output[$i] != '<') {
                if($output[$i] == ':') {
                    $x = 1;
//                        $i = $i + 2;
                }
                
                if($x == 1)    {
                    $availabilityString[$counter] = $availabilityString[$counter] . $output[$i];    
                }
                $i++;                    
            }            
        } else {
            while($i < $length)    {
                if($output[$i] == ':') {
                    $x = 1;
//                        $i = $i + 2;
                }
                
                if($x == 1) {
                    $availabilityString[$counter] = $availabilityString[$counter] . $output[$i];            
                }
                $i++;
            }            
        }            
        $i = $i+4;
        $counter++;
    }

    $t = 0;
    while($t < 3) {
        ltrim($availabilityString[$t]);
        $availabilityString[$t] = substr($availabilityString[$t], 2);
        $t++;
    }
    
    if($availabilityString[0] != '') {
        $available = explode('|', $availabilityString[0]);
        $countAvailable = count($available);

        $t = 0;
    
        print('<h2 class="blue">Available Domains</h2><p>');
        
        while($t < $countAvailable)    {
            print('www.<strong>' . $available[$t] . "</strong><br />");
            $t++;
        }
        print('</p>');        
    }    
        
    if($availabilityString[1] != '') {
        $notAvailable = explode('|', $availabilityString[1]);
        $countNotAvailable = count($notAvailable);
        
        $t = 0;
    
        print('<h2 class="red">Taken Domains</h2><p>');
        
        while($t < $countNotAvailable) {
            print('www.<strong>' . $notAvailable[$t] . "</strong><br />");
            $t++;
        }
        print('</p>');        
    }            
        
    if($availabilityString[2] != "") {
        $failure = explode('|', $availabilityString[2]);
        $countFailure = count($failure);
        
        $t = 0;
    
        print('<h2 class="red">Failed Domain Checks</h2><p>');
        
        while($t < $countFailure) {
            print('- www.<strong>' . $failure[$t] . "</strong><br />");
            $t++;
        }
        print('</p>');        
    }
    
    print("<p>Please note: The domain checker does not reserve your chosen domain or guarantee a successful registration.</p>");
    
    if($availabilityString[0] != '') {
    
        print('<h2 class="green">To register your domain, please call one of our consultants</h2>');
    
    }
} 

Any help would be appreciated

[AnthonySterling]

isset()

[rezyn8]

Thanks, while it may be obvious to you, it does not really help me that much. What do I need to do with isset() in order for the script to work? It seems something is deprecated in the above code because it works on an older version of PHP.

[AnthonySterling]

The index $t is not available in $availabilityString, the index is therefore undefined. As this "used to work", chances are the error reporting has been increased. You can check if the $availabilityString[$t] index "is set" with isset().