EricBusch/Mycode_Replace_Missing_Images_With_External_Images.php

## 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