Filter non-captioned images to include source link

source-link-non-captioned-images.php

<?php
/**
 * Filter non-captioned images to include source link
 * 
 */
add_filter( 'the_content', 'ac_add_sources_non_captioned', 11 );

function ac_add_sources_non_captioned( $content ) {

	if ( is_singular( array( 'post', ) ) ) {

		$search = $replace = array();

		// Match non-captioned images
		if ( preg_match_all( '/(<p[^>]*?>\s*)((?:<a [^>]+>\s*)?<img [^>]+)wp-image-(\d+)([^>]+>(?:\s*<\/a>)?)/', $content, $matches, PREG_SET_ORDER ) ) {

			foreach ( $matches as $match ) {

				$source_url = get_post_meta( $match[3], '_wp_attachment_source_url', true );

				// We have a source
				if ( ! empty( $source_url ) ) {

					// Source name
					$source_name = get_post_meta( $match[3], '_wp_attachment_source_name', true );

					if ( empty( $source_name ) ) {

						$parsed_url = parse_url( $source_url );

						$source_name = str_replace( 'www.', '', $parsed_url['host'] );

					}

					// Alignment
					if ( false !== ( strpos( $match[2], 'alignnone' ) || strpos( $match[4], 'alignnone' ) ) ) {
						$alignment = 'none';
						$style = '';
					}
					elseif ( false !== ( strpos( $match[2], 'alignright' ) || strpos( $match[4], 'alignright' ) ) ) {
						$alignment = 'right';
						$style = '';
					}
					elseif ( false !== ( strpos( $match[2], 'alignleft' ) || strpos( $match[4], 'alignleft' ) ) ) {
						$alignment = 'left';
						$style = '';
					}
					elseif ( false !== ( strpos( $match[2], 'aligncenter' ) || strpos( $match[4], 'aligncenter' ) ) ) {
						$alignment = 'center';
						// get width!
						if ( preg_match( '/width="(\d+)"/', $match[4], $width ) ) {
							$style = ' style="width:' . $width[1] . 'px;"';	
						}
						else {
							$style = '';
						}
					}
					else {
						continue;
					}

					// Build search and replace arrays
					$search[] = '%' . preg_quote( $match[1] . $match[2] . 'wp-image-' . $match[3] . $match[4], '%' ) . '%';

					$replace[] = $match[1] . '<span class="image-wrap image-wrap-' . $alignment . '"' . $style . '>' . $match[2] . 'wp-image-' . $match[3] . $match[4] . '<span class="source"><a href="' . esc_url( $source_url ) . '" target="_blank">' . $source_name . '</a></span></span>';

				}

			}

		}

		// preg_replace
		if ( ! empty ( $search ) ) {

			$content = preg_replace( $search, $replace, $content );

		}

	}

	return $content;

}