Wordpress Post Content to Caption and Gallery Field ACF

convert-content-to-fields.php

<?php 


// vars
$post_id = get_the_id();
$images = get_field('gallery');
$caption = get_field('caption');
$content = get_the_content();

// var_dump($post_id);
// var_dump($images);
// var_dump($caption);

if(empty($images)):


	function get_attachment_id( $url ) {

	$attachment_id = 0;

	$dir = wp_upload_dir();

	if ( false !== strpos( $url, $dir['baseurl'] . '/' ) ) { // Is URL in uploads directory?

	    $file = basename( $url );

	    $query_args = array(
	        'post_type'   => 'attachment',
	        'post_status' => 'inherit',
	        'fields'      => 'ids',
	        'meta_query'  => array(
	            array(
	                'value'   => $file,
	                'compare' => 'LIKE',
	                'key'     => '_wp_attachment_metadata',
	            ),
	        )
	    );

	    $query = new WP_Query( $query_args );

	    if ( $query->have_posts() ) {

	        foreach ( $query->posts as $post_id ) {

	            $meta = wp_get_attachment_metadata( $post_id );

	            $original_file       = basename( $meta['file'] );
	            $cropped_image_files = wp_list_pluck( $meta['sizes'], 'file' );

	            if ( $original_file === $file || in_array( $file, $cropped_image_files ) ) {
	                $attachment_id = $post_id;
	                break;
	            }

	        }

	    }

	}

	return $attachment_id;
	}

	function linkExtractor($html){
	$linkArray = array();
	if(preg_match_all('/<img\s+.*?src=[\"\']?([^\"\' >]*)[\"\']?[^>]*>/i',$html,$matches,PREG_SET_ORDER)){
	foreach($matches as $match){
		if(!empty($match)){
	array_push($linkArray,array($match[1],$match[2]));
		}
	}
	}
	return $linkArray;
	}
	$icount = 0;
	$image_arrray = linkExtractor($content);
	$attachments_array = array();
	foreach($image_arrray as $image){
	$icount++;
	$url = $image[0];
	// echo "<br><strong>Image ".$icount.":</strong> ";
	// echo $url;
	// echo "<br>";
	// echo "<br><strong>Image ".$icount." ID:</strong> ";
	$imageid =  get_attachment_id($url);
	// echo $imageid; 
	$attachments_array[] = $imageid;
	}
	update_field('gallery',$attachments_array,$post_id)

endif; // images

if(empty($caption)):

	// text to caption field
	$withptags = wpautop($content);
	$caption = strip_tags($withptags);
	// echo($caption);
	update_field('caption',$caption,$post_id);

endif; // caption
?>