PHP Array filter regular expressions

Question

Hi all i have an array shown below

Array
(
    [0] => http://api.tweetmeme.com/imagebutton.gif?url=http://mashable.com/2010/09/25/trailmeme/ 
    [1] => http://cdn.mashable.com/wp-content/plugins/wp-digg-this/i/gbuzz-feed.png 
    [2] => http://mashable.com/wp-content/plugins/wp-digg-this/i/fb.jpg 
    [3] => http://mashable.com/wp-content/plugins/wp-digg-this/i/diggme.png 
    [4] => http://ec.mashable.com/wp-content/uploads/2009/01/bizspark2.gif 
    [5] => http://cdn.mashable.com/wp-content/uploads/2010/09/web.png 
    [6] => http://mashable.com/wp-content/uploads/2010/09/Screen-shot-2010-09-24-at-10.51.26-PM.png 
    [7] => http://cdn.mashable.com/wp-content/uploads/2009/02/bizspark.jpg 
    [8] => http://feedads.g.doubleclick.net/~at/lxx00QTjYBaYojpnpnTa6MXUmh4/0/di 
    [9] => 
    [10] => http://feedads.g.doubleclick.net/~at/lxx00QTjYBaYojpnpnTa6MXUmh4/1/di 
    [11] => 
    [12] => http://feeds.feedburner.com/~ff/Mashable?i=0N_mvMwPHYk:j5Pmi_N-JQ8:D7DqB2pKExk 
    [13] => 
    [14] => http://feeds.feedburner.com/~ff/Mashable?i=0N_mvMwPHYk:j5Pmi_N-JQ8:V_sGLiPBpWU 
    [15] => 
    [16] => http://feeds.feedburner.com/~ff/Mashable?i=0N_mvMwPHYk:j5Pmi_N-JQ8:F7zBnMyn0Lo 
    [17] => 
    [18] => http://feeds.feedburner.com/~ff/Mashable?d=qj6IDK7rITs 
    [19] => 
    [20] => http://feeds.feedburner.com/~ff/Mashable?d=_e0tkf89iUM 
    [21] => 
    [22] => http://feeds.feedburner.com/~ff/Mashable?i=0N_mvMwPHYk:j5Pmi_N-JQ8:gIN9vFwOqvQ 
    [23] => 
    [24] => http://feeds.feedburner.com/~ff/Mashable?d=yIl2AUoC8zA 
    [25] => 
    [26] => http://feeds.feedburner.com/~ff/Mashable?d=P0ZAIrC63Ok 
    [27] => 
    [28] => http://feeds.feedburner.com/~ff/Mashable?d=I9og5sOYxJI 
    [29] => 
    [30] => http://feeds.feedburner.com/~ff/Mashable?d=CC-BsrAYo0A 
    [31] => 
    [32] => http://feeds.feedburner.com/~ff/Mashable?i=0N_mvMwPHYk:j5Pmi_N-JQ8:_cyp7NeR2Rw 
    [33] => 
    [34] => http://feeds.feedburner.com/~r/Mashable/~4/0N_mvMwPHYk
)

basically, i want to

1. remove every empty array element
2. remove every array item without extensions ".jpg,.png,.gif" in its name;
3. finally remove array items containing keywords such as "digg,fb,tweet,bizspark".

Answer 1

foreach ($array as $key => $value) {
    if (
        empty($value)||
        (preg_match('#^http:\/\/(.*)\.(gif|png|jpg)$#i', $value) == 0)||
        (preg_match('#(tweet|bizspark)#i', $value) > 0)
    ) {
        unset($array[$key]);
    }
}

Answer 2

Using, e.g., array_filter() will give you flexibility and ease of maintenance (changing requirements, de-bugging, etc.):

function url_array_filter($url)
{
    static $words = array('digg', 'fb', 'tweet', 'bizspark');
    static $extens = array('.jpg', '.png', '.gif');
    $ret = true;
    if (!$url) {
        $ret = false;
    } elseif (str_replace($words, '', $url) != $url) {
        $ret = false;
    } else {
        $path = parse_url($url, PHP_URL_PATH);
        if (in_array(substr($path, -4), $extens)) {
            $ret = false;
        }
    }
    return $ret;
}

$arr = array_filter($arr, 'url_array_filter');
print_r($arr);

(Works for the array given, but may need changes; it's demo code.)

Answer 3

Hi @GZipp, have tried ur code and it returns eg hi, ive tried the above code... it returns an array containing the stuff i want out.

hi, ive tried the above code... it returns an array containing the stuff i want out. )

Array ( [5] =>
http://feedads.g.doubleclick.net/~at/W-z_kHMi30EtE1mpxK8NvMmNmeg/0/di
[7] =>
http://feedads.g.doubleclick.net/~at/W-z_kHMi30EtE1mpxK8NvMmNmeg/1/di
[9] =>
http://feeds.feedburner.com/~ff/Mashable?i=mEedXAp78pg:339cIishd6A:D7DqB2pKExk
[11] =>
http://feeds.feedburner.com/~ff/Mashable?i=mEedXAp78pg:339cIishd6A:V_sGLiPBpWU
[13] =>
http://feeds.feedburner.com/~ff/Mashable?i=mEedXAp78pg:339cIishd6A:F7zBnMyn0Lo
[15] =>
http://feeds.feedburner.com/~ff/Mashable?d=qj6IDK7rITs
[17] =>
http://feeds.feedburner.com/~ff/Mashable?d=_e0tkf89iUM
[19] =>
http://feeds.feedburner.com/~ff/Mashable?i=mEedXAp78pg:339cIishd6A:gIN9vFwOqvQ
[21] =>
http://feeds.feedburner.com/~ff/Mashable?d=yIl2AUoC8zA
[23] =>
http://feeds.feedburner.com/~ff/Mashable?d=P0ZAIrC63Ok
[25] =>
http://feeds.feedburner.com/~ff/Mashable?d=I9og5sOYxJI
[27] =>
http://feeds.feedburner.com/~ff/Mashable?d=CC-BsrAYo0A
[29] =>
http://feeds.feedburner.com/~ff/Mashable?i=mEedXAp78pg:339cIishd6A:_cyp7NeR2Rw
[31] =>
http://feeds.feedburner.com/~r/Mashable/~4/mEedXAp78pg
))

)

i would like it to return eg from first example

[5] => http://cdn.mashable.com/wp-content/uploads/2010/09/web.png 
    [6] => http://mashable.com/wp-content/uploads/2010/09/Screen-shot-2010-09-24-at-10.51.26-PM.png 

any ideas?

Answer 4

Hi GZIp i have modified the code and im getting better results

function url_array_filter($url)
{
    static $words = array('digg', 'fb', 'tweet', 'bizspark','feedburner','feedads','CountImage');
    static $extens = array('.jpg', '.png', '.gif');
    $ret = true;
    if (!$url) {
        $ret = false;
    } elseif (str_replace($words, '', $url) != $url) {
        $ret = false;
    } else {
        $path = parse_url($url, PHP_URL_PATH);
        if (in_array(substr($path, -4), $extens)) {
            $ret = false;
        }
    }
    return $ret;
} 

my problem now comes with the output. eg

Array ( [0] => http://cdn.dzone.com/images/thumbs/120x90/491551.jpg' style='width:120;height:90;float:left;vertical-align:top;border:1px solid ) 

Array ( [0] => http://cdn.dzone.com/images/thumbs/120x90/490913.jpg' style='width:120;height:90;float:left;vertical-align:top;border:1px solid ) 

i want the url only. i think i have the problem with extracting urls from original content. lemme post a link to the origial question and what im doing.

http://stackoverflow.com/questions/3793768/rss-feeds-and-image-extraction-indepth

i simply want the url. i think from that link.... getImagesUrl() maybe messing up. im going to try and use parse_url to bring back the correct url. lemme know if im on right track. im very close to manage pulling image urls from rss feeds parsed with magpie

Answer 5

Ok GZip, this is the modification and addition ive added to ur code... 95% works!! great. although i do receive some funny results im posting below

function url_array_filter($url)
{
    static $words = array('digg', 'fb', 'tweet', 'bizspark','feedburner','feedads','CountImage','fuelbrand');
    static $extens = array('.jpg', '.png', '.gif');
    $ret = true;
    if (!$url) {
        $ret = false;
    } elseif (str_replace($words, '', $url) != $url) {
        $ret = false;
    } else {
        $path = parse_url($url, PHP_URL_PATH);
        if (in_array(substr($path, -4), $extens)) {
            $ret = false;
        }
    }
    return $ret;
} 

function cleanURL($a_url)
    {
    $ret=array();
    foreach ($a_url as $c)
        {
        $a=parse_url($c, PHP_URL_SCHEME).'://'.parse_url($c, PHP_URL_HOST).parse_url($c, PHP_URL_PATH);    
        $a=explode("'",$a);
        $ret[]=$a[0];
        }
    return $ret;         
    }

example usage. $this->getImagesUrl($c); below returns results in first question.

                    foreach($content as $c) {
                        // get the images in content
                        $arr = $this->getImagesUrl($c);
                        $arr = array_filter($arr, 'url_array_filter');
                        }
                    $ret=cleanURL($arr);
                    if (count($ret)>0)
                        {
                        print_r($ret);                                
                        echo "<br/><br/>";
                        }

up to this point almost everything works great but i keep getting some bad results like

Array ( [0] => http://cdn.mashable.com/wp-content/uploads/2010/02/ipad-side- )
Array ( [0] => http://mrg.bz/FZtr2k [1] => http://mrg.bz/IDkx4w ) 

people we almost there... any ideas