EricBusch · May 22, 2019 14:18
diff --git a/Mycode_Replace_Missing_Images_With_External_Images.php b/Mycode_Replace_Missing_Images_With_External_Images.php
 <?php

 /**
 * Class Mycode_Replace_Missing_Images_With_External_Images
 *
 * Replaces any placeholder images with hotlinked image from merchant's server.
 *
 * @since 1.0.0
 */
 class Mycode_Replace_Missing_Images_With_External_Images {

 	private $css_class = 'dfr-external-image';
 	private $max_width = '300px';
 	private $max_height = '300px';
 	private $image_fields = [ 'image', 'thumbnail' ];

 	public function init() {
 		add_action( 'wp_head', [ $this, 'add_css' ] );
 		add_filter( 'woocommerce_product_get_image', [ $this, 'get_image_tag_for_loop' ], 100, 2 );
 		add_filter( 'woocommerce_placeholder_img_src', [ $this, 'replace_placeholder_img_src' ], 20, 1 );
 	}

 	/**
 	 * Add CSS to <head> element to handle clipping and sizing of external images.
 	 *
 	 * @link https://stackoverflow.com/a/51447865/2489248
 	 */
 	function add_css() {
 		echo '<style type="text/css">';
 		echo 'ul.products .' . $this->css_class . ' {position:relative;width:100%;margin-bottom:22.652px;} ';
 		echo 'ul.products .' . $this->css_class . ':after {content:"";display:block;padding-bottom:100%;} ';
 		echo 'ul.products .' . $this->css_class . ' img {position:absolute;top:0;bottom:0;left:0;right:0;width:100%;height:100%;object-fit:cover;object-position:center;max-width:' . $this->max_width . ';}';
 		echo '</style>';
 	}

 	/**
 	 * Replace placeholder <img> tags inside WC Loop with <img> tag with src attribute
 	 * of product's external image URL.
 	 *
 	 * @param string $image HTML string containing the full <img> tag markup.
 	 * @param WC_Product $product
 	 *
 	 * @return string
 	 */
 	function get_image_tag_for_loop( $image, $product ) {

 		if ( ! preg_match( "/woocommerce-placeholder/i", $image ) ) {
 			return $image;
 		}

 		if ( empty( $dfr_product = dfrps_product( $product->get_id() ) ) ) {
 			return $image;
 		}

 		if ( ! $src = $this->get_external_image_src( $dfr_product ) ) {
 			return $image;
 		}

 		$attributes           = [];
 		$attributes['width']  = absint( $this->max_width );
 		$attributes['height'] = absint( $this->max_height );
 		$attributes['src']    = esc_url( $src );
 		$attributes['class']  = 'attachment-woocommerce_thumbnail size-woocommerce_thumbnail';
 		$attributes['alt']    = esc_attr( $product->get_name() );

 		$format = '<div class="%1$s"><img %2$s /></div>';

 		return sprintf( $format, esc_attr( $this->css_class ), implode( ' ', array_map( function ( $k, $v ) {
 			return $k . '="' . $v . '"';
 		}, array_keys( $attributes ), $attributes ) ) );
 	}

 	/**
 	 * Replace URL of placeholder image with the URL from the "image" field to
 	 * hotlink the product image direct from merchant's server.
 	 *
 	 * @param string $src URL of default WooCommerce placeholder image.
 	 *
 	 * @return string URL The URL of the product image from the merchant's server.
 	 */
 	function replace_placeholder_img_src( $src ) {

 		/** @var WC_Product $product */
 		global $product;

 		if ( ! is_product() ) {
 			return $src;
 		}

 		if ( ! is_subclass_of( $product, 'WC_Product' ) ) {
 			return $src;
 		}

 		if ( empty( $dfr_product = dfrps_product( $product->get_id() ) ) ) {
 			return $src;
 		}

 		if ( $external_src = $this->get_external_image_src( $dfr_product ) ) {
 			$src = $external_src;
 		}

 		return $src;
 	}

 	/**
 	 * Returns the first occurrence of an image field for the Datafeedr product
 	 * or false if no image fields are found.
 	 *
 	 * @param array $product A full Datafeedr product array.
 	 *
 	 * @return bool|string
 	 */
 	private function get_external_image_src( $product ) {
 		foreach ( $this->image_fields as $field ) {
 			if ( isset( $product[ $field ] ) && $this->starts_with( $product[ $field ], [ 'http', '//' ] ) ) {
 				return $product[ $field ];
 			}
 		}

 		return false;
 	}

 	/**
 	 * Determine if a given string starts with a given substring.
 	 *
 	 * @param string $haystack
 	 * @param string|array $needles
 	 *
 	 * @return bool
 	 */
 	private function starts_with( $haystack, $needles ) {
 		foreach ( (array) $needles as $needle ) {
 			if ( $needle !== '' && substr( $haystack, 0, strlen( $needle ) ) === (string) $needle ) {
 				return true;
 			}
 		}

 		return false;
 	}
 }

 ( new Mycode_Replace_Missing_Images_With_External_Images() )->init();

 // EOF
	<?php

	/**
	* Class Mycode_Replace_Missing_Images_With_External_Images
	*
	* Replaces any placeholder images with hotlinked image from merchant's server.
	*
	* @since 1.0.0
	*/
	class Mycode_Replace_Missing_Images_With_External_Images {

	private $css_class = 'dfr-external-image';
	private $max_width = '300px';
	private $max_height = '300px';
	private $image_fields = [ 'image', 'thumbnail' ];

	public function init() {
	add_action( 'wp_head', [ $this, 'add_css' ] );
	add_filter( 'woocommerce_product_get_image', [ $this, 'get_image_tag_for_loop' ], 100, 2 );
	add_filter( 'woocommerce_placeholder_img_src', [ $this, 'replace_placeholder_img_src' ], 20, 1 );
	}

	/**
	* Add CSS to <head> element to handle clipping and sizing of external images.
	*
	* @link https://stackoverflow.com/a/51447865/2489248
	*/
	function add_css() {
	echo '<style type="text/css">';
	echo 'ul.products .' . $this->css_class . ' {position:relative;width:100%;margin-bottom:22.652px;} ';
	echo 'ul.products .' . $this->css_class . ':after {content:"";display:block;padding-bottom:100%;} ';
	echo 'ul.products .' . $this->css_class . ' img {position:absolute;top:0;bottom:0;left:0;right:0;width:100%;height:100%;object-fit:cover;object-position:center;max-width:' . $this->max_width . ';}';
	echo '</style>';
	}

	/**
	* Replace placeholder <img> tags inside WC Loop with <img> tag with src attribute
	* of product's external image URL.
	*
	* @param string $image HTML string containing the full <img> tag markup.
	* @param WC_Product $product
	*
	* @return string
	*/
	function get_image_tag_for_loop( $image, $product ) {

	if ( ! preg_match( "/woocommerce-placeholder/i", $image ) ) {
	return $image;
	}

	if ( empty( $dfr_product = dfrps_product( $product->get_id() ) ) ) {
	return $image;
	}

	if ( ! $src = $this->get_external_image_src( $dfr_product ) ) {
	return $image;
	}

	$attributes = [];
	$attributes['width'] = absint( $this->max_width );
	$attributes['height'] = absint( $this->max_height );
	$attributes['src'] = esc_url( $src );
	$attributes['class'] = 'attachment-woocommerce_thumbnail size-woocommerce_thumbnail';
	$attributes['alt'] = esc_attr( $product->get_name() );

	$format = '<div class="%1$s"><img %2$s /></div>';

	return sprintf( $format, esc_attr( $this->css_class ), implode( ' ', array_map( function ( $k, $v ) {
	return $k . '="' . $v . '"';
	}, array_keys( $attributes ), $attributes ) ) );
	}

	/**
	* Replace URL of placeholder image with the URL from the "image" field to
	* hotlink the product image direct from merchant's server.
	*
	* @param string $src URL of default WooCommerce placeholder image.
	*
	* @return string URL The URL of the product image from the merchant's server.
	*/
	function replace_placeholder_img_src( $src ) {

	/** @var WC_Product $product */
	global $product;

	if ( ! is_product() ) {
	return $src;
	}

	if ( ! is_subclass_of( $product, 'WC_Product' ) ) {
	return $src;
	}

	if ( empty( $dfr_product = dfrps_product( $product->get_id() ) ) ) {
	return $src;
	}

	if ( $external_src = $this->get_external_image_src( $dfr_product ) ) {
	$src = $external_src;
	}

	return $src;
	}

	/**
	* Returns the first occurrence of an image field for the Datafeedr product
	* or false if no image fields are found.
	*
	* @param array $product A full Datafeedr product array.
	*
	* @return bool\|string
	*/
	private function get_external_image_src( $product ) {
	foreach ( $this->image_fields as $field ) {
	if ( isset( $product[ $field ] ) && $this->starts_with( $product[ $field ], [ 'http', '//' ] ) ) {
	return $product[ $field ];
	}
	}

	return false;
	}

	/**
	* Determine if a given string starts with a given substring.
	*
	* @param string $haystack
	* @param string\|array $needles
	*
	* @return bool
	*/
	private function starts_with( $haystack, $needles ) {
	foreach ( (array) $needles as $needle ) {
	if ( $needle !== '' && substr( $haystack, 0, strlen( $needle ) ) === (string) $needle ) {
	return true;
	}
	}

	return false;
	}
	}

	( new Mycode_Replace_Missing_Images_With_External_Images() )->init();

	// EOF