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<title>[53144] trunk: Formatting: Avoid escaping valid XML values in `esc_xml()`.</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/53144">53144</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/53144","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>audrasjb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-04-11 19:58:04 +0000 (Mon, 11 Apr 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'>Formatting: Avoid escaping valid XML values in `esc_xml()`.
This change improves the `esc_xml()` function by replacing two `empty()` checks with `isset()` to cover values that are not equal to `''` but still returning `true` when checked with `empty()`, like `'0'`, `0` or `false`. It also updates the related unit tests accordingly.
Props rumpel2116, pbiron.
Fixes <a href="https://core.trac.wordpress.org/ticket/55399">#55399</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesformattingphp">trunk/src/wp-includes/formatting.php</a></li>
<li><a href="#trunktestsphpunittestsformattingescXmlphp">trunk/tests/phpunit/tests/formatting/escXml.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludesformattingphp"></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/formatting.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/formatting.php 2022-04-11 19:08:19 UTC (rev 53143)
+++ trunk/src/wp-includes/formatting.php 2022-04-11 19:58:04 UTC (rev 53144)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4639,11 +4639,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $safe_text = (string) preg_replace_callback(
</span><span class="cx" style="display: block; padding: 0 10px"> $regex,
</span><span class="cx" style="display: block; padding: 0 10px"> static function( $matches ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! $matches[0] ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( ! isset( $matches[0] ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> return '';
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! empty( $matches['non_cdata'] ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if ( isset( $matches['non_cdata'] ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> // escape HTML entities in the non-CDATA Section.
</span><span class="cx" style="display: block; padding: 0 10px"> return _wp_specialchars( $matches['non_cdata'], ENT_XML1 );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunktestsphpunittestsformattingescXmlphp"></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/formatting/escXml.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/formatting/escXml.php 2022-04-11 19:08:19 UTC (rev 53143)
+++ trunk/tests/phpunit/tests/formatting/escXml.php 2022-04-11 19:58:04 UTC (rev 53144)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -42,6 +42,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "SELECT meta_key, meta_value FROM wp_trunk_sitemeta WHERE meta_key IN ('site_name', 'siteurl', 'active_sitewide_plugins', '_site_transient_timeout_theme_roots', '_site_transient_theme_roots', 'site_admins', 'can_compress_scripts', 'global_terms_enabled') AND site_id = 1",
</span><span class="cx" style="display: block; padding: 0 10px"> 'SELECT meta_key, meta_value FROM wp_trunk_sitemeta WHERE meta_key IN ('site_name', 'siteurl', 'active_sitewide_plugins', '_site_transient_timeout_theme_roots', '_site_transient_theme_roots', 'site_admins', 'can_compress_scripts', 'global_terms_enabled') AND site_id = 1',
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Zero string.
+ array(
+ '0',
+ '0',
+ ),
</ins><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></span></pre>
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