Convert jpg/png on webp on content modx

gistfile1.txt

<?php
	if (!function_exists('imageWebp')) return;
	set_time_limit(200);
	define('MODX_API_MODE', true);
	define('IN_MANAGER_MODE', false);	
	include_once("index.php");	
	$modx->db->connect();	
	if (empty ($modx->config)) {
		$modx->getSettings();
	}	
	$res = $modx->db->query('Select id,content from '.$modx->getFullTableName('site_content'));
	while($row = $modx->db->getRow($res)){
		$content = $row['content'];
		preg_match_all('/<img[^>]+>/i',$content, $result); 
		if (count($result))	{
			foreach($result[0] as $img_tag)	{	
				preg_match('/(src)=("[^"]*")/i',$img_tag, $img[$img_tag]);						
				$img_real = str_replace('"','',$img[$img_tag][2]);
				$img_real = str_replace('./','',$img_real);			
				
				$full = MODX_BASE_PATH.$img_real;
				$info = getimagesize($full);
				$ex = $info['mime'];
				
				if (($ex=='image/jpeg') or ($ex=='image/png')) {
					if ($ex=='image/jpeg') $webp = imageCreateFromJpeg($full);
					if ($ex=='image/png') $webp = imageCreateFromPng($full);			
					imageWebp($webp, $full . '.' . 'webp', 100);
					imagedestroy($webp);
					$content = str_replace($img_real,$img_real.'.webp',$content);
				}
			 	
			}
		}
		
		$modx->db->update(['content'=>$content],$modx->getFullTableName('site_content'),'id='.$row['id']);		
	}	
	echo 'Complete!';