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<?php
namespace Perfmatters;
class Images
{
//initialize image functions
public static function init()
{
add_action('wp', array('Perfmatters\Images', 'queue'));
}
//queue functions
public static function queue()
{
//image dimensions
if(!empty(Config::$options['lazyload']['image_dimensions']) && !empty(Config::$options['lazyload']['image_dimensions'])) {
add_action('perfmatters_output_buffer_template_redirect', array('Perfmatters\Images', 'image_dimensions'));
}
}
//fix images missing dimensions
public static function image_dimensions($html)
{
//match all img tags without width or height attributes
preg_match_all('#<img((?:[^>](?!(height|width)=[\'\"](?:\S+)[\'\"]))*+)>#is', $html, $images, PREG_SET_ORDER);
if(!empty($images)) {
//remove any duplicate images
$images = array_unique($images, SORT_REGULAR);
//loop through images
foreach($images as $image) {
//get image attributes array
$image_atts = Utilities::get_atts_array($image[1]);
if(!empty($image_atts['src'])) {
//get image dimensions
$dimensions = self::get_dimensions_from_url($image_atts['src']);
if(!empty($dimensions)) {
//remove any existing dimension attributes
$new_image = preg_replace('/(height|width)=[\'"](?:\S+)*[\'"]/i', '', $image[0]);
//add dimension attributes to img tag
$new_image = preg_replace('/<\s*img/i', '<img width="' . $dimensions['width'] . '" height="' . $dimensions['height'] . '"', $new_image);
//replace original img tag in html
if(!empty($new_image)) {
$html = str_replace($image[0], $new_image, $html);
}
}
}
}
}
return $html;
}
//return array of dimensions based on image url
private static function get_dimensions_from_url($url)
{
//grab dimensions from file name if available
if(preg_match('/(?:.+)-([0-9]+)x([0-9]+)\.(jpg|jpeg|png|gif|svg)$/', $url, $matches)) {
return array('width' => $matches[1], 'height' => $matches[2]);
}
//get image path
$image_path = str_replace('/wp-content', '', WP_CONTENT_DIR) . '/' . parse_url($url)['path'];
if(file_exists($image_path)) {
//get dimensions from file
$sizes = getimagesize($image_path);
if(!empty($sizes)) {
return array('width' => $sizes[0], 'height' => $sizes[1]);
}
}
return false;
}
}