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<title>[53028] trunk: Media: Introduce `wp_content_img_tag` filter.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/53028">53028</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/53028","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>flixos90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-03-29 23:56:18 +0000 (Tue, 29 Mar 2022)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Media: Introduce `wp_content_img_tag` filter.
This filter allows modifying individual `img` tags within a blob of content that are by default processed by the `wp_filter_content_tags()` function. The addition of this filter facilitates plugins that tweak images to accomplish this goal without re-implementing duplicate content image parser logic, which furthermore can have a negative performance impact due to additional regular expressions.
In addition to the filterable `img` tag, the filter receives the context (typically the function or filter in which the content is parsed) and the attachment ID. The latter may be 0, in case the image is not an attachment (for example when it is an external image URL).
Props adamsilverstein, flixos90, pbearne, peterwilsoncc.
Fixes <a href="https://core.trac.wordpress.org/ticket/55347">#55347</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesmediaphp">trunk/src/wp-includes/media.php</a></li>
<li><a href="#trunktestsphpunittestsmediaphp">trunk/tests/phpunit/tests/media.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludesmediaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/media.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/media.php 2022-03-29 21:46:09 UTC (rev 53027)
+++ trunk/src/wp-includes/media.php 2022-03-29 23:56:18 UTC (rev 53028)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1843,6 +1843,17 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $filtered_image = wp_img_tag_add_loading_attr( $filtered_image, $context );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Filters an img tag within the content for a given context.
+ *
+ * @since 6.0.0
+ *
+ * @param string $filtered_image Full img tag with attributes that will replace the source img tag.
+ * @param string $context Additional context, like the current filter name or the function name from where this was called.
+ * @param int $attachment_id The image attachment ID. May be 0 in case the image is not an attachment.
+ */
+ $filtered_image = apply_filters( 'wp_content_img_tag', $filtered_image, $context, $attachment_id );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( $filtered_image !== $match[0] ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $content = str_replace( $match[0], $filtered_image, $content );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunktestsphpunittestsmediaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/media.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/media.php 2022-03-29 21:46:09 UTC (rev 53027)
+++ trunk/tests/phpunit/tests/media.php 2022-03-29 23:56:18 UTC (rev 53028)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2294,6 +2294,17 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @ticket 55347
+ */
+ public function test_wp_filter_content_tags_has_filter() {
+ $filter = new MockAction();
+ add_filter( 'wp_content_img_tag', array( &$filter, 'filter' ) );
+ $img_tag_1 = get_image_tag( self::$large_id, '', '', '', 'medium' );
+
+ wp_filter_content_tags( $img_tag_1 );
+ $this->assertSame( 1, $filter->get_call_count() );
+ }
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * @ticket 33641
</span><span class="cx" style="display: block; padding: 0 10px"> * @ticket 34528
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span></span></pre>
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