กดถูกใจ เป็นกำลังใจให้เรา 😍

VIR9.COM

ขอบคุณน๊าา 🥰

Close

  • WORDPRESS FIND FEATURED IMAGE OR FIRST IMAGE IN POST, FIND DIMENSIONS & ID BY URL

    April 27, 2018

    THIS IS GREAT FOR WORDPRESS SITES WITH POSTS AND MEDIA THAT HAVE BEEN IMPORTED FROM ANOTHER INSTALL. ON THE CLIENT’S SITE, SOME IMAGES HAD FEATURED IMAGES, SOME ONLY HAD IMAGES IN THE CONTENT ITSELF, AND OF THE CONTENT IMAGES, SOME WERE INTERNAL, OTHERS EXTERNAL. THESE IMAGES ARE GRABBED TO USE AT THE CORRECT SIZE FOR ARCHIVE/HOMEPAGE THUMBNAILS*/

    1. Look for featured image, show if present
    2. Otherwise look for the first image in the content (whether internal or external)
    3. Check for an attachment ID, if present, show image at correct dimensions
    4. Otherwise show image at normal URL without thumbnail dimensions

    VARIABLES

    • $size = post thumbnail / custom image sizes
    • $url = return a URL or full image tag
    <?php
 
 /*Find the image id from a URL*/
 
function url_get_image_id($image_url) {
    global $wpdb;
    $attachment = $wpdb->get_col($wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE guid='%s';", $image_url ));
    return $attachment[0];
}
 
/* determine whether post has a featured image, if not, find the first image inside the post content, $size passes the thumbnail size, $url determines whether to return a URL or a full image tag*/
 
function checkImageType($size, $type) {
 
    global $post;
    $content = $post->post_content;                
    $first_img = '';
    ob_start();
    ob_end_clean();
    $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $content, $matches);
    $first_img = $matches[1][0];
 
    /*If there's a featured image, show it*/
 
    if (get_the_post_thumbnail($post_id) != '' ) {
        if($type=='url') {
            the_post_thumbnail_url($size);
        } else {
            the_post_thumbnail($size);
        }
    } else {
 
        /*No featured image, so we get the first image inside the post content*/
 
        if ($first_img) {
 
            //let's get the correct image dimensions
 
            $image_id = url_get_image_id($first_img);
            $image_thumb = wp_get_attachment_image_src($image_id, $size);
 
            // if we've found an image ID, correctly display it
 
            if($image_thumb) {
                if($type=='url') {
                    echo $image_thumb[0];
                } else {
 
                    echo '<img src="'.$image_thumb[0].'" alt="'.get_the_title().'"/>';
                }
            } else {
 
                //if no image (i.e. from an external source), echo the original URL
 
                if($type=='url') {
                    echo $first_img;
                } else {
 
                    echo '<img src="'.$first_img.'" alt="'.get_the_title().'"/>';
                }
 
            }
        }
    }
}
 
?>

    An some sample uses:

    <?php 
 
checkImageType('full', 'url'); 
 
// Returns: http://domain.com/image-url.jpg)
 
checkImageType('post-thumb');
 
// Returns: <img src="http://domain.com/image-url.jpg" alt="Alt text">
 
?>

    http://www.amberweinberg.com/wordpress-find-featured-image-or-first-image-in-post-find-dimensions-id-by-url/


เวอไนน์ไอคอร์ส

ประหยัดเวลากว่า 100 เท่า!

เวอไนน์เว็บไซต์⚡️
สร้างเว็บไซต์ ดูแลเว็บไซต์

Categories