Checking if an index in a multidimensional array is an array

Question

The code:

    $row['text'] = 'http://t.co/iBSiZZD4 and http://t.co/1rG3oNmc and http://t.co/HGFjwqHI and http://t.co/8UldEAVt';

    if(preg_match_all('|http:\/\/t.co\/.{1,8}|i',$row['text'],$matches)){
        foreach($matches[0] as $value){
            $headers = get_headers($value,1);
            if(is_array($headers['Location'])){
                $headers['Location'] = $headers['Location'][0];
            }
            $row['text'] = preg_replace('|http:\/\/t.co\/.{1,8}|i', '<a href="' . $headers['Location'] . '">' . $headers['Location'] . '</a>',$row['text']);
        }
    }

This is related to get_headers(). Sometimes get_headers($url,1) returns an array with a location index key like so: [Location]=>Array([0]=>url1 [1]=>url2). I basically want to make [Location] equal to [Location][0] if [Location][0] exists. However, the above code doesn't seem to accomplish that task. I've also tried array_key_exists() and isset() but neither solved the problem. Thoughts?

$headers['Location'] is not normally an array. That's why I'm checking if it is an array so I can take alternative action. — Chad
– Chad, Commented Aug 4, 2012 at 20:11
this should work... Make sure that $headers is not read-only. — Aadaam
– Aadaam, Commented Aug 4, 2012 at 20:13
@cwscribner: What do you mean it doesn't work? What is the result you're getting? — Madara's Ghost
– Madara's Ghost, Commented Aug 4, 2012 at 20:16
Your code works fine for me, make sure your array looks like what you think it looks like. codepad.viper-7.com/DKjPM1 — Madara's Ghost
– Madara's Ghost, Commented Aug 4, 2012 at 20:25

Madara's Ghost · Accepted Answer · 2012-08-04 20:53:37Z

2

Don't try to replace on the fly. First get all the values, and then do the replace in one batch (using two arrays as the $search and $replace parameters).

<?php

    $replace = array();
    $row = array('text' => 'http://t.co/iBSiZZD4 and http://t.co/1rG3oNmc and http://t.co/HGFjwqHI and http://t.co/8UldEAVt');
    if (preg_match_all('|http:\/\/t.co\/.{1,8}|i', $row['text'], $search)) {
        foreach ($search[0] as $value) {
            $headers = get_headers($value, 1);
            if (is_array($headers['Location'])) {
                $headers['Location'] = $headers['Location'][0];
            }
            $replace[] = "<a href='{$headers["Location"]}'>{$headers["Location"]}</a>";
        }
        $row['text'] = str_replace($search[0], $replace, $row['text']);
        echo $row["text"];
    }

P.S. - Next time, please tell us the context of your problem, tell us you "are making a service that resolves shortened URLs", don't let me figure that out from your code alone.

answered Aug 4, 2012 at 20:53

Madara's Ghost

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1 Comment

Chad Over a year ago

On a side note, I think I may have to find an alternative to get_headers(). It keeps failing to open stream, maybe because of the amount of links I have.

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