PHP - Redimensionar imágenes

<?php

$image_path = "img/image.png";

//Asignamos el tamano de las imagenes a variables
list($width, $height, $type, $attr)= getimagesize($image_path); 

//especificamos el porcentaje del tamano original
$percent_resizing = 80;

$new_width = round((($percent_resizing/100)*$width));
$new_height = round((($percent_resizing/100)*$height));

echo '<img src="'.$image_path.'" height="'.$new_height.'" width="'.$new_width.'">';
                
?>