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<title>[53803] trunk: Plugins: Introduce `did_filter()` function.</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/53803">53803</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/53803","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-07-31 14:18:36 +0000 (Sun, 31 Jul 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'>Plugins: Introduce `did_filter()` function.
While most of the action functions are aliases for the respective filter functions, using `did_action()` to detect whether a filter has been run is not possible, as it only works specifically for actions.
This is now resolved by introducing a new function, `did_filter()`, which retrieves the number of times a filter has been applied during the current request, bringing parity with `did_action()`.
Follow-up to <a href="https://core.trac.wordpress.org/changeset/4630">[4630]</a>, <a href="https://core.trac.wordpress.org/changeset/6318">[6318]</a>, <a href="https://core.trac.wordpress.org/changeset/27294">[27294]</a>.
Props mordauk, chriscct7, andykeith, nacin, dd32, markparnell, SergeyBiryukov.
Fixes <a href="https://core.trac.wordpress.org/ticket/35357">#35357</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludespluginphp">trunk/src/wp-includes/plugin.php</a></li>
<li><a href="#trunktestsphpunittestsfiltersphp">trunk/tests/phpunit/tests/filters.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludespluginphp"></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/plugin.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/plugin.php 2022-07-31 13:09:00 UTC (rev 53802)
+++ trunk/src/wp-includes/plugin.php 2022-07-31 14:18:36 UTC (rev 53803)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -30,6 +30,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> /** @var int[] $wp_actions */
</span><span class="cx" style="display: block; padding: 0 10px"> global $wp_actions;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/** @var int[] $wp_filters */
+global $wp_filters;
+
</ins><span class="cx" style="display: block; padding: 0 10px"> /** @var string[] $wp_current_filter */
</span><span class="cx" style="display: block; padding: 0 10px"> global $wp_current_filter;
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -43,6 +46,10 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $wp_actions = array();
</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">+if ( ! isset( $wp_filters ) ) {
+ $wp_filters = array();
+}
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( ! isset( $wp_current_filter ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $wp_current_filter = array();
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -155,6 +162,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * by adding it to the function signature.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @global WP_Hook[] $wp_filter Stores all of the filters and actions.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @global int[] $wp_filters Stores the number of times each filter was triggered.
</ins><span class="cx" style="display: block; padding: 0 10px"> * @global string[] $wp_current_filter Stores the list of current filters with the current one last.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $hook_name The name of the filter hook.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -163,8 +171,14 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @return mixed The filtered value after all hooked functions are applied to it.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> function apply_filters( $hook_name, $value, ...$args ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- global $wp_filter, $wp_current_filter;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ global $wp_filter, $wp_filters, $wp_current_filter;
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! isset( $wp_filters[ $hook_name ] ) ) {
+ $wp_filters[ $hook_name ] = 1;
+ } else {
+ ++$wp_filters[ $hook_name ];
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> // Do 'all' actions first.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( isset( $wp_filter['all'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $wp_current_filter[] = $hook_name;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -204,6 +218,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * functions hooked to `$hook_name` are supplied using an array.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @global WP_Hook[] $wp_filter Stores all of the filters and actions.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @global int[] $wp_filters Stores the number of times each filter was triggered.
</ins><span class="cx" style="display: block; padding: 0 10px"> * @global string[] $wp_current_filter Stores the list of current filters with the current one last.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $hook_name The name of the filter hook.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -211,8 +226,14 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * @return mixed The filtered value after all hooked functions are applied to it.
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> function apply_filters_ref_array( $hook_name, $args ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- global $wp_filter, $wp_current_filter;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ global $wp_filter, $wp_filters, $wp_current_filter;
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! isset( $wp_filters[ $hook_name ] ) ) {
+ $wp_filters[ $hook_name ] = 1;
+ } else {
+ ++$wp_filters[ $hook_name ];
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> // Do 'all' actions first.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( isset( $wp_filter['all'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $wp_current_filter[] = $hook_name;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -378,6 +399,26 @@
</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">+ * Retrieves the number of times a filter has been applied during the current request.
+ *
+ * @since 6.1.0
+ *
+ * @global int[] $wp_filters Stores the number of times each filter was triggered.
+ *
+ * @param string $hook_name The name of the filter hook.
+ * @return int The number of times the filter hook has been applied.
+ */
+function did_filter( $hook_name ) {
+ global $wp_filters;
+
+ if ( ! isset( $wp_filters[ $hook_name ] ) ) {
+ return 0;
+ }
+
+ return $wp_filters[ $hook_name ];
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Adds a callback function to an action hook.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * Actions are the hooks that the WordPress core launches at specific points
</span></span></pre></div>
<a id="trunktestsphpunittestsfiltersphp"></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/filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/filters.php 2022-07-31 13:09:00 UTC (rev 53802)
+++ trunk/tests/phpunit/tests/filters.php 2022-07-31 14:18:36 UTC (rev 53803)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -150,6 +150,31 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertSame( $expected, $a->get_events() );
</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">+ /**
+ * @covers ::did_filter
+ */
+ public function test_did_filter() {
+ $tag1 = 'filter1';
+ $tag2 = 'filter2';
+ $val = __FUNCTION__ . '_val';
+
+ // Apply filter $tag1 but not $tag2.
+ apply_filters( $tag1, $val );
+ $this->assertSame( 1, did_filter( $tag1 ) );
+ $this->assertSame( 0, did_filter( $tag2 ) );
+
+ // Apply filter $tag2 10 times.
+ $count = 10;
+ for ( $i = 0; $i < $count; $i++ ) {
+ apply_filters( $tag2, $val );
+ }
+
+ // $tag1's count hasn't changed, $tag2 should be correct.
+ $this->assertSame( 1, did_filter( $tag1 ) );
+ $this->assertSame( $count, did_filter( $tag2 ) );
+
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> public function test_all_filter() {
</span><span class="cx" style="display: block; padding: 0 10px"> $a = new MockAction();
</span><span class="cx" style="display: block; padding: 0 10px"> $tag1 = __FUNCTION__ . '_1';
</span></span></pre>
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