Ubuntu
) manipulation on the frontend: WP_Smush_Content
*
* This class is for front-end functionality only! Do not confuse with class-wp-smushit that does all the image
* manipulation stuff on the back-end.
*
* @since 3.2.0
* @package WP_Smush
*/
if ( ! defined( 'WPINC' ) ) {
die;
}
abstract class WP_Smush_Content extends WP_Smush_Module {
/**
* Get image tags from page content.
*
* @since 3.1.0
* @since 3.2.0 Moved to WP_Smush_Content from WP_Smush_CDN
*
* @param string $content Page content.
*
* @return array
*/
protected function get_images_from_content( $content ) {
$images = array();
if ( preg_match_all( '/(?:]*?\s+?src=["|\'](?P[^\s]+?)["|\'].*?>){1}/is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
}
return $images;
}
/**
* Add attribute to selected tag.
*
* @since 3.1.0
* @since 3.2.0 Moved to WP_Smush_Content from WP_Smush_CDN
*
* @param string $element Image element.
* @param string $name Img attribute name (srcset, size, etc).
* @param string $value Attribute value.
*/
protected function add_attribute( &$element, $name, $value ) {
$closing = false === strpos( $element, '/>' ) ? '>' : ' />';
$element = rtrim( $element, $closing ) . " {$name}=\"{$value}\"{$closing}";
}
/**
* Get attribute from an HTML element.
*
* @since 3.2.0
*
* @param string $element HTML element.
* @param string $name Attribute name.
*
* @return string
*/
protected function get_attribute( $element, $name ) {
$value = array();
preg_match( '//i', $element, $value );
return isset( $value['2'] ) ? $value['2'] : '';
}
/**
* Remove attribute from selected tag.
*
* @since 3.2.0
*
* @param string $element Image element.
* @param string $attribute Img attribute name (srcset, size, etc).
*/
protected function remove_attribute( &$element, $attribute ) {
$element = preg_replace( '/' . $attribute . '=[\'|"](.*?)[\'|"]/', '', $element );
}
}