wordpress image thumbnail list Hook

wordpress_image.php

<?php

// Upload to Custom folder in media_handle_upload
https://wordpress.stackexchange.com/questions/290257/media-handle-upload-with-custom-upload-folder

//Download image and to attachment
https://codex.wordpress.org/Function_Reference/media_handle_sideload

//change SrcSet
https://gschoppe.com/wordpress/fix-broken-images-after-wordpress-4-4-update/
function gs_change_attachment_image_markup($attributes){

    if (isset($attributes['src'])) {
        $attributes['data-flickity-lazyload-src'] = $attributes['src'];
        $attributes['src']      = '';
    }

    if (isset($attributes['srcset'])) {
        $attributes['data-flickity-lazyload-srcset'] = $attributes['srcset'];
        $attributes['srcset'] = '';
    }

    return $attributes;
}

add_filter( 'wp_get_attachment_image_attributes', 'gs_change_attachment_image_markup' );


//change Attr filter
https://www.sitepoint.com/wordpress-change-img-tag-html/
https://jhtechservices.com/changing-your-image-markup-in-wordpress/

//get path image by name size
function scaled_image_path($attachment_id, $size = 'thumbnail') {
    $file = get_attached_file($attachment_id, true);
    if (empty($size) || $size === 'full') {
        // for the original size get_attached_file is fine
        return realpath($file);
    }
    if (! wp_attachment_is_image($attachment_id) ) {
        return false; // the id is not referring to a media
    }
    $info = image_get_intermediate_size($attachment_id, $size);
    if (!is_array($info) || ! isset($info['file'])) {
        return false; // probably a bad size argument
    }

    return realpath(str_replace(wp_basename($file), $info['file'], $file));
}


//get path attachment base
$fullsize_path = get_attached_file( $attachment_id ); // Full path


//Upload and convert image to base64
require_once( ABSPATH . 'wp-admin/includes/image.php' );
require_once( ABSPATH . 'wp-admin/includes/file.php' );
require_once( ABSPATH . 'wp-admin/includes/media.php' );

$attachment_id = media_handle_upload( 'image', $_POST['post_id'] );
if ( is_wp_error( $attachment_id ) ) {
	$image="";
} else {

	$img_file = scaled_image_path($attachment_id, $size = 'sarbaz');
	// Read image path, convert to base64 encoding
	$imgData = base64_encode(file_get_contents($img_file));
	// Format the image SRC:  data:{mime};base64,{data};
	$src = 'data:'.mime_content_type($img_file).';base64,'.$imgData;
	$image = $src;

	wp_delete_attachment( $attachment_id, true );
}



//Get Attachemnt info
function wp_get_attachment( $attachment_id ) {
$attachment = get_post( $attachment_id );
return array(
    'alt' => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
    'caption' => $attachment->post_excerpt,
    'description' => $attachment->post_content,
    'href' => get_permalink( $attachment->ID ),
    'src' => $attachment->guid,
    'title' => $attachment->post_title
);
}


https://stackoverflow.com/questions/14200815/how-to-hook-into-wordpress-thumbnail-generation

/*
ad_image_size with custom jpeg quality
*/
https://github.com/StickyBeat/custom-image-size-quality
https://wordpress.stackexchange.com/questions/74103/set-jpeg-compression-for-specific-custom-image-sizes


/*
prefilter name in wordpress
*/
add_filter('wp_handle_upload_prefilter', 'custom_upload_filter' );
function custom_upload_filter( $file ){
    $file['name'] = 'wordpress-is-awesome-' . $file['name'];
    return $file;
}

// rename file after upload
function wp_modify_uploaded_file_names($file) {
    $info = pathinfo($file['name']);
    $ext  = empty($info['extension']) ? '' : '.' . $info['extension'];
    $name = basename($file['name'], $ext);

    $file['name'] = uniqid() . $ext; // uniqid method
    // $file['name'] = md5($name) . $ext; // md5 method
    // $file['name'] = base64_encode($name) . $ext; // base64 method

    return $file;
}

add_filter('wp_handle_upload_prefilter', 'wp_modify_uploaded_file_names', 1, 1);


/** 
 * Remove Orginal Image Size
 */  
add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata )
{
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    $deleted = unlink( $full_image_path );

    return $metadata;
}


/** 
 * Get All image Size
 */  
get_intermediate_image_sizes() => https://codex.wordpress.org/Function_Reference/get_intermediate_image_size

/** 
 * Snippet Name: Disable auto creating of image sizes 
 * Snippet URL: http://www.wpcustoms.net/snippets/disable-auto-creating-image-sizes/ 
 */  
 function wpc_unset_imagesizes($sizes){  
    unset( $sizes['thumbnail']);  
    unset( $sizes['medium']);  
    unset( $sizes['large']);  
}  
add_filter('intermediate_image_sizes_advanced', 'wpc_unset_imagesizes' );  



/** 
 * How to Add your Custom Image Size into Media Uploader
 */  
function add_custom_sizes_to_editor($sizes) {  
    unset( $sizes['thumbnail']);  
    unset( $sizes['medium']);  
    unset( $sizes['large']);  
  
 $custom_sizes = array(  
  
        'thumbnail-custom' => 'Custom Thumbnails' //300x200  
    );  
    if( !emptyempty($sizes) )  
        return array_merge($sizes, $custom_sizes);  
    else  
        return $custom_sizes;  
}  
add_filter('image_size_names_choose', 'add_custom_sizes_to_editor');  



/*
 * this hook will be fired while you uploading a picture
 */
add_filter( 'intermediate_image_sizes', 'rudr_reduce_image_sizes' );
 
function rudr_reduce_image_sizes( $sizes ){
	/*
	 * $sizes - all image sizes array Array ( [0] => thumbnail [1] => medium [2] => large [3] => post-thumbnail )
	 * get_post_type() to get post type
	 */
	$type = get_post_type($_REQUEST['post_id']); // $_REQUEST['post_id'] post id the image uploads to
 
	foreach( $sizes as $key => $value ){
 
		/*
		 * use switch if there are a lot of post types
		 */
		if( $type == 'page' ) {
			if( $value == 'regionfeatured' ){ // turn off 'regionfeatured' for pages
    				unset( $sizes[$key] );
    			}
		} else if ( $type == 'region' ) {
			if( !in_array( $value, array('regionfeatured','misha335') ) ){ // for regions turn off everyting except 'regionfeatured' and 'misha335'
    				unset( $sizes[$key] );
    			}
		} else {
			if( $value != 'thumbnail' ){ // turn off everything except thumbnail
    				unset( $sizes[$key] );
    			}
		}
	}
	return $sizes;
}