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Retrieve 1st image in post and set it as featured image, when post is saved/updated

I need a function that when a post is saved/updated, it will scan the post for the first image. This image has already been uploaded to the media gallery but it has not been attached to the post. So, after the function finds this image, it has to attach it to the post, and after it is attached, it has to set it as featured.

I have been looking for something like this over many forums, but unfortunately I haven't been able to find it.

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marked as duplicate by Rarst Apr 28 '12 at 8:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

3  
Sorry, this sounds like a gimme teh codez question. Please try at least to start with some code you have written. And there are many snippets doing exactly this out there. –  toscho Apr 15 '12 at 2:21
1  
if you look into the right sidebar here - under 'related' - there are some at least partly useful approaches. –  Michael Apr 15 '12 at 11:15
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2 Answers

@toscho is right, please do some research before posting your question.

Here's one peice of the puzzle that should get the ball rolling for you, courtesy of bavotasan.com. It finds the first image in the post and displays it.

function getImage($num) {
    global $more;

    $more    = 1;
    $link    = get_permalink();
    $content = get_the_content();
    $count   = substr_count($content, '<img');
    $start   = 0;

    for ($i=1; $i <= $count; $i++) {
        $imgBeg = strpos($content, '<img', $start);
        $post   = substr($content, $imgBeg);
        $imgEnd = strpos($post, '>');

        $postOutput = substr($post, 0, $imgEnd + 1);
        $postOutput = preg_replace('/width="([0-9]*)" height="([0-9]*)"/', '',$postOutput);;
        $image[$i]  = $postOutput;

        $start = $imgEnd + 1;
    }
    if (stristr($image[$num],'<img')) {
        echo '<a href="' . $link . '">' . $image[$num] . "</a>";
    }
    $more = 0;
}

Good luck.

P.S. Google search time < 30 seconds

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up vote 0 down vote accepted

great, yeah i did some research. I posted here as last resort. However, last night I found this plugin http://www.bbqiguana.com/wordpress-plugins/add-linked-images-to-gallery/ it does quite what I want, but it is getting only external images. How can I adapt it so it also gets internal images??

here is the code:

<?php
    /*
 Plugin Name: Add Linked Images To Gallery
 Plugin URI:  http://www.bbqiguana.com/wordpress-plugins/add-linked-images-to-gallery/
 Version: 1.4
 Description: Examines the text of a post and makes local copies of all the images linked though IMG tags, adding them as gallery attachments on the post itself.
 Author: Randy Hunt
 Author URI: http://www.bbqiguana.com/
 */

require_once(ABSPATH . 'wp-admin/includes/file.php');
require_once(ABSPATH . 'wp-admin/includes/media.php');

$externimg_count = 0;

function externimg_find_imgs ($post_id) {

    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return;

    if (wp_is_post_revision($post_id)) return;

    if ($c=get_option('externimg_catlist')) {
        $catfound = false;
        $catlist = get_the_category($post_id);
        foreach ($catlist as $category) {
            if (in_array($category->cat_ID, explode(',', $c)))
                $catfound = true;
        }
        if (!$catfound) return;
    }
    $post = get_post($post_id);
    $a = get_option('externimg_authlist');
    if($a && !in_array($post->post_author, explode(',', $a))) return;

    $l = get_option('externimg_replacesrc');
    $k = get_option('externimg_custtagname');
    $processed = get_post_custom_values($k, $post_id);
    $replaced = false;
    $content = $post->post_content;
    $imgs = externimg_get_img_tags($post_id);
    global $externimg_count;

    for($i=0; $i<count($imgs); $i++) {
        if (!$processed || !in_array($imgs[$i], $processed)) {

            $parseurl = parse_url($imgs[$i]);
            $pathname = $parseurl['path'];
            $filename = substr(strrchr($pathname, '/'), 1);
            if (preg_match ('/(\.php|\.aspx?)$/', $filename) ) $filename .= '.jpg';
            $imgid   = externimg_sideload($imgs[$i], $filename, $post_id);
            $imgpath = wp_get_attachment_url($imgid);
            if (!is_wp_error($imgpath)) {
                if ($l=='custtag') {
                    add_post_meta($post_id, $k, $imgs[$i], false);
                } else {
                    $trans = preg_quote($imgs[$i], "/");
                    $content = preg_replace('/(<img[^>]* src=[\'"]?)('.$trans.')/', '$1'.$imgpath, $content);
                    $replaced = true;
                }
                $processed[] = $imgs[i];
                $externimg_count++;
            }
        }
    }
    if ($replaced) {
        $upd = array();
        $upd['ID'] = $post_id;
        $upd['post_content'] = $content;
        wp_update_post($upd);
    }
}

function externimg_getext ($file) {
    if (function_exists('mime_content_type'))
        $mime = mime_content_type($file);
    else return '';
    switch($mime) {
        case 'image/jpg':
        case 'image/jpeg':
            return '.jpg';
            break;
        case 'image/gif':
            return '.gif';
            break;
        case 'image/png':
            return '.png';
            break;
    }
    return '';
}

function externimg_sideload ($file, $url, $post_id) {
    if(!empty($file)){
        $file_array['tmp_name'] = download_url($file);
        if(is_wp_error($file_array['tmp_name'])) return;
        $file_array['name'] = basename($file);
        //$desc = @$desc;
        $desc = externimg_getext($file);

        $pathparts = pathinfo($file_array['tmp_name']);
        if (''==$pathparts['extension']) {
            $ext = externimg_getext($file_array['tmp_name']);
            rename($file_array['tmp_name'], $file_array['tmp_name'] . $ext);
            $file_array['name'] = basename($file_array['tmp_name']) . $ext;
            $file_array['tmp_name'] .= $ext;
        }

        $id = media_handle_sideload($file_array, $post_id, $desc);
        $src = $id;

        if(is_wp_error($id)) {
            @unlink($file_array['tmp_name']);
            return $id;
        }
    }
    if (!empty($src)) return $src;
    else return false;
}

function externimg_get_img_tags ($post_id) {
    $post = get_post($post_id);
    $w = get_option('externimg_whichimgs');
    $s = get_option('siteurl');

    $result = array();
    //preg_match_all('/<img[^>]+src=\\\\?[\'"]?([^>\\\"\' ]+)/', $content, $matches);
    preg_match_all('/<img[^>]* src=[\'"]?([^>\'" ]+)/', $post->post_content, $matches);
    for ($i=0; $i<count($matches[0]); $i++) {
        $uri = $matches[1][$i];

        //only check FQDNs
        if (preg_match('/^http:\/\//', $uri)) {
            //make sure it's not external
            if ($s != substr($uri, 0, strlen($s)) ) {
                //only match Flickr images?
                if($w == 'All' || 
                   ($w == 'Flickr' && preg_match('/^http:\/\/[a-z0-9]+\.static\.flickr\.com\//', $uri)) ) {
                    $result[] = $matches[1][$i];
                }
            }
        }
    }
    return $result;
}

function externimg_savefile ($file, $url, $post_id) {
    $time = null;

    $uploads = wp_upload_dir($time);
    $filename = wp_unique_filename( $uploads['path'], $url, $unique_filename_callback );
    $savepath = $uploads['path'] . "/$filename";

    if($fp = fopen($savepath, 'w')) {
        fwrite($fp, $file);
        fclose($fp);
    }

    $wp_filetype = wp_check_filetype( $savepath, $mimes );
    $type = $wp_filetype['type'];
    $title = $filename;
    $content = '';

    // Construct the attachment array
    $attachment = array(
                        'post_mime_type' => $type,
                        'guid' => $uploads['url'] . "/$filename",
                        'post_parent' => $post_id,
                        'post_title' => $title,
                        'post_content' => $content
                        );

    // Save the data
    $id = wp_insert_attachment($attachment, $savepath, $post_id);
    if ( !is_wp_error($id) ) {
        wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
    } else return '';
    return $uploads['url'] . "/$filename";
}


//modified from code found at http://www.bin-co.com/php/scripts/load/
function externimg_loadimage ($url) {

    $url_parts = parse_url($url);
    $ch = false;
    $info = array(//Currently only supported by curl.
                  'http_code'    => 200
                  );
    $response = '';

    $send_header = array(
                         'Accept' => 'text/*',
                         'User-Agent' => 'Attach-Linked-Images WordPress Plugin (http://www.bbqiguana.com/)'
                         );



    ///////////////////////////// Curl /////////////////////////////////////
    //If curl is available, use curl to get the data.
    if(function_exists("curl_init")) {  //$options['use'] == 'fsocketopen'))) { //Don't use curl if it is specifically stated to use fsocketopen in the options

        $page = $url;

        $ch = curl_init($url_parts['host']);

        curl_setopt($ch, CURLOPT_URL, $page) or die("Invalid cURL Handle Resouce");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //Just return the data - not print the whole thing.
        curl_setopt($ch, CURLOPT_HEADER, true); //We need the headers
        curl_setopt($ch, CURLOPT_NOBODY, false); //Yes, get the body.

        //Set the headers our spiders sends
        curl_setopt($ch, CURLOPT_USERAGENT, $send_header['User-Agent']); //The Name of the UserAgent we will be using ;)
        $custom_headers = array("Accept: " . $send_header['Accept'] );
        curl_setopt($ch, CURLOPT_HTTPHEADER, $custom_headers);

        @curl_setopt($ch, CURLOPT_COOKIEJAR, "/tmp/binget-cookie.txt"); //If ever needed...
        @curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        @curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
        @curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        if(isset($url_parts['user']) and isset($url_parts['pass'])) {
            $custom_headers = array("Authorization: Basic ".base64_encode($url_parts['user'].':'.$url_parts['pass']));
            curl_setopt($ch, CURLOPT_HTTPHEADER, $custom_headers);
        }

        $response = curl_exec($ch);
        $info = curl_getinfo($ch); //Some information on the fetch
        if('http://l.yimg.com/g/images/photo_unavailable.gif'==$info['url']) $body = '';
        curl_close($ch);  //If the session option is not set, close the session.

        //////////////////////////////////////////// FSockOpen //////////////////////////////
    } else { //If there is no curl, use fsocketopen - but keep in mind that most advanced features will be lost with this approch.
        if(isset($url_parts['query'])) {
            $page = $url_parts['path'] . '?' . $url_parts['query'];
        } else {
            $page = $url_parts['path'];
        }

        if(!isset($url_parts['port'])) $url_parts['port'] = 80;
        $fp = fsockopen($url_parts['host'], $url_parts['port'], $errno, $errstr, 30);
        if ($fp) {
            $out = "GET $page HTTP/1.0\r\n"; //HTTP/1.0 is much easier to handle than HTTP/1.1
            $out .= "Host: $url_parts[host]\r\n";
            $out .= "Accept: $send_header[Accept]\r\n";
            $out .= "User-Agent: {$send_header['User-Agent']}\r\n";
            $out .= "Connection: Close\r\n";

            //HTTP Basic Authorization support
            if(isset($url_parts['user']) and isset($url_parts['pass'])) {
                $out .= "Authorization: Basic ".base64_encode($url_parts['user'].':'.$url_parts['pass']) . "\r\n";
            }
            $out .= "\r\n";

            fwrite($fp, $out);
            while (!feof($fp)) {
                $response .= fgets($fp, 128);
            }
            fclose($fp);
        }
    }

    //Get the headers in an associative array
    $headers = array();

    if($info['http_code'] == 404 || $info['http_code'] == 400) {
        $body = '';
        $headers['Status'] = 404;
    } else {
        //Seperate header and content
        $header_text = substr($response, 0, $info['header_size']);
        $body = substr($response, $info['header_size']);

        foreach(explode("\n",$header_text) as $line) {
            $parts = explode(": ",$line);
            if(count($parts) == 2) $headers[$parts[0]] = chop($parts[1]);
        }
    }

    //if($options['return_info']) return array('body' => $body, 'info' => $info, 'curl_handle'=>$ch);
    return $body;
}

function externimg_backcatalog () {
    global $externimg_count;
    $count = 0;
    $pp = get_posts( array( 'numberposts'=>-1 ) );
    foreach ($pp as $p) {
        try {
            //echo '<p>' . $p->ID . ': ' . $p->title . '</p>';
            echo '<p>[' . $p->ID . '] ' . $p->post_title . ': ';
            externimg_find_imgs($p->ID);
            echo '<em>' . $externimg_count . ' images processed.</em></p>';
        } catch (Exception $e) {
            echo '<em>an error occurred</em>.</p>';
        }
        $count += $externimg_count;
    }
}

function externimg_getauthors() {
    global $wpdb;
    $query = "SELECT $wpdb->users.* FROM $wpdb->users ORDER BY display_name;";
    $authors = $wpdb->get_results($query);
    return $authors;
}

function externimg_menu () {
    if ( function_exists('add_options_page') ) {
        add_options_page('Linked IMGs to Gallery', 'Linked IMGs', 8, 'externimg', 'externimg_options');
    }
}

function externimg_init () {
    //$plugin_dir = basename(dirname(__FILE__));
    //load_plugin_textdomain('externimg', 'wp-content/plugins/'.$plugin_dir, 'externimg');

    register_setting('externimg', 'externimg_whichimgs');
    register_setting('externimg', 'externimg_replacesrc');
    register_setting('externimg', 'externimg_custtagname');
    register_setting('externimg', 'externimg_cats');
    register_setting('externimg', 'externimg_auths');
    register_setting('externimg', 'externimg_catlist');
    register_setting('externimg', 'externimg_authlist');
}

function externimg_install () {
    //add default options
    $whichimgs   = get_option('externimg_whichimgs');
    $replacesrc  = get_option('externimg_replacesrc');
    $custtagname = get_option('externimg_custtagname');
    $catlist     = get_option('externimg_catlist');
    $authlist    = get_option('externimg_authlist');

    if(!$whichimgs)   update_option('externimg_whichimgs',   'All');
    if(!$replacesrc)  update_option('externimg_replacesrc',  'replace');
    if(!$custtagname) update_option('externimg_custtagname', 'externimg');
    if(!$catlist)     update_option('externimg_catlist',     '');
    if(!$authlist)    update_option('externimg_authlist',    '');
}

function externimg_options () {
    $_cats  = '';
    $_auths = '';
    echo '<div class="wrap">';
    echo '<h2>Linked IMGs to Gallery Attachments</h2>';

    if ($_POST['action']=='backcatalog') {
        externimg_backcatalog();
        echo '<div id="message" class="updated fade" style="background-color:rgb(255,251,204);"><p>Finished processing past posts!</p></div>';
    }

    if ($_POST['action']=='update') {
        //check_admin_referer('externimg_update-action');
        //          $_cats  = implode(',', $_POST['externimg_cats']);
        //          $_auths = implode(',', $_POST['externimg_auths']);
        update_option('externimg_whichimgs',   $_POST['externimg_whichimgs'] );
        update_option('externimg_replacesrc',  $_POST['externimg_replacesrc'] );
        update_option('externimg_custtagname', $_POST['externimg_custtagname'] );
        if($_POST['externimg_catlist'])  update_option('externimg_catlist',  $_cats );
        update_option('externimg_catlist',  ($_POST['externimg_catlist'] ) ? implode(',', $_POST['externimg_cats'] ) : '');
        update_option('externimg_authlist', ($_POST['externimg_authlist']) ? implode(',', $_POST['externimg_auths']) : '');
        //          if($_POST['externimg_authlist']) update_option('externimg_authlist', $_auths);
        //          update_option('externimg_catlist',     $_POST['externimg_catlist'] );
        //          update_option('externimg_authlist',    $_POST['externimg_authlist'] );
        echo '<div id="message" class="updated fade" style="background-color:rgb(255,251,204);"><p>Settings updated.</p></div>';
    }
    echo '<big>Options</big>';
    echo '<form name="externimg-options" method="post" action="">';
    settings_fields('externimg');
    echo '<table class="form-table"><tbody>';
    echo '<tr valign="top"><th scope="row"><strong>Which external IMG links to process:</strong></th>';
    echo '<td><label for="myradio1"><input id="myradio1" type="radio" name="externimg_whichimgs" value="All" ' . (get_option('externimg_whichimgs')!='Flickr'?'checked="checked"':'') . '/> All images</label><br/>';
    echo '<label for="myradio2"><input id="myradio2" type="radio" name="externimg_whichimgs" value="Flickr" ' . (get_option('externimg_whichimgs')=='Flickr'?'checked="checked"':'') . ' /> Only Flickr images</label><br/>';
    echo '<p>By default, all external images are processed.  This can be set to only apply to Flickr.</p>';
    echo '</td></tr>';
    echo '<tr valign="top"><th scope="row"><strong>What to do with the images:</th>';
    echo '<td><label for="myradio3"><input id="myradio3" type="radio" name="externimg_replacesrc" value="replace" ' . (get_option('externimg_replacesrc')!='custtag'?'checked="checked"':'') . ' /> Replace SRC attribute with local copy</label><br/>';
    echo '<label for="myradio4"><input id="myradio4" type="radio" name="externimg_replacesrc" value="custtag" ' . (get_option('externimg_replacesrc')=='custtag'?'checked="checked"':'') . ' /> Use custom tag:</label> ';
    echo '<input type="text" size="20" name="externimg_custtagname" value="' . get_option('externimg_custtagname') . '" /><br/>';
    echo '<p>Replacing the SRC attribute will convert the external IMG link to a local link, pointed at the local copy downloaded by this plugin. If the SRC attribute is not replaced, the plugin needs to mark the IMG as having been processed somehow, so this is done by tracking processed images in custom_tag values.  You can change the name of the custom tag.</p></td></tr>';
    //  echo '<tr valign="top"><th scope="row">This site name:</th><td>' . get_option('siteurl') . '</td></tr>';

    echo '<tr align="top"><th scope="row"><strong>Apply to these categories:</strong></th>';
    echo '<td><label for="myradio5"><input type="radio" id="myradio5" name="externimg_catlist" value="" ' . (get_option('externimg_catlist')==''?'checked="checked"':'') . ' /> All categories</label><br/>';
    echo '<label for="myradio6"><input type="radio" id="myradio6" name="externimg_catlist" value="Y" ' . (get_option('externimg_catlist')!=''?'checked="checked"':'') . ' /> Selected categories</label><br/>';

    $_cats = explode(',', get_option('externimg_catlist'));
    $chcount = 0;
    $cats = get_categories();
    foreach ($cats as $cat) {
        $chcount++;
        echo '<label for="mycheck'.$chcount.'"><input type="checkbox" id="mycheck'.$chcount.'" name="externimg_cats[]" value="' . $cat->cat_ID . '" '.(in_array($cat->cat_ID, $_cats)?'checked="checked"':'').' /> ' . $cat->cat_name . '</label><br/>';
    }
    echo '</td></tr>';
    echo '<tr align="top"><th scope="row"><strong>Apply to these authors:</strong></th>';
    echo '<td><label for="myradio7"><input type="radio" id="myradio7" name="externimg_authlist" value="" ' . (get_option('externimg_authlist')==''?'checked="checked"':'') . ' /> All authors</label><br/>';
    echo '<label for="myradio8"><input type="radio" id="myradio8" name="externimg_authlist" value="Y" ' . (get_option('externimg_authlist')!=''?'checked="checked"':'') . ' /> Selected authors</label><br/>';

    $_auths = explode(',', get_option('externimg_authlist'));
    $auths = externimg_getauthors();
    foreach ($auths as $auth) {
        $chcount++;
        echo '<label for="mycheck'.$chcount.'"><input type="checkbox" id="mycheck'.$chcount.'" name="externimg_auths[]" value="' . $auth->ID . '" '.(in_array($auth->ID, $_auths)?'checked="checked"':'').'/> ' . $auth->display_name . '</label><br/>';
    }
    echo '</td></tr>';

    echo '</tbody></table>';
    echo '<div class="submit">';
    //echo '<input type="hidden" name="externimg_update" value="action" />';
    echo '<input type="submit" name="submit" class="button-primary" value="' . __('Save Changes') . '" />';
    echo '</div>';
    echo '</form>';

    echo '<form name="externimg-backcatalog" method="post" action="">';
    echo '<div class="wrap">';
    echo '<big>Process all posts</big>';
    echo '<p>Use this function to apply the plugin to all previous posts. The settings specified above will still be respected.</p>';
    echo '<p><em>Please note that this can take a long time for sites with a lot of posts.</em></p>';
    echo '<div class="submit">';
    echo '<input type="hidden" name="action" value="backcatalog">';
    echo '<input type="submit" class="button-primary" value="' . __('Process') . '" />';
    echo '</div>';
    echo '<p>&nbsp;</p>';
    echo '</div>';
    echo '</form>';

    echo '<div class="wrap">';
    echo '<big>Donate</big>';
    echo '<p>If you like this plugin consider donating a small amount to the author using PayPal to support further plugin development.</p>';
    echo '<div align="center"><form name="_xclick" action="https://www.paypal.com/us/cgi-bin/webscr" method="post"><input type="hidden" name="cmd" value="_xclick"><input type="hidden" name="business" value="bbqiguana@gmail.com"><input type="hidden" name="item_name" value="Donations for WP-Externimage Plugin"><input type="hidden" name="currency_code" value="USD"><input type="image" src="http://www.paypal.com/en_US/i/btn/btn_donate_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it\'s fast, free and secure!"></form></div>';
    echo '<p>If you think donating money is somehow impersonal you could also choose items from my <a href="http://www.amazon.com/registry/wishlist/18LMHOMRM49P8/ref=cm_wl_act_vv">Amazon.com wishlist</a>.</p>';
    echo '</div>';
    echo '';
    echo '</div>';
}

if ( is_admin() ) { // admin actions
    add_action('admin_menu', 'externimg_menu');
    add_action('admin_init', 'externimg_init');
}
register_activation_hook(__FILE__, 'externimg_install');

add_action('save_post', 'externimg_find_imgs');

?>
share|improve this answer
    
for some reason, this plugin wont work when creating posts from external services like scoop.it or email2wp... So how can we make it work? –  Gixty Apr 15 '12 at 21:46
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