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<title>[45638] trunk/src/wp-includes/compat.php: Code Modernisation: Document when the Hash polyfills can be removed.</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/45638">45638</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/45638","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>pento</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-07-15 05:13:10 +0000 (Mon, 15 Jul 2019)</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'>Code Modernisation: Document when the Hash polyfills can be removed.
The Hash extension cannot be disabled as of PHP 7.4. So, while we can't remove these polyfills yet, we can document when we'll be able to.
Props jrf.
Fixes <a href="https://core.trac.wordpress.org/ticket/47698">#47698</a>.</pre>
<h3>Modified Paths</h3>
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<li><a href="#trunksrcwpincludescompatphp">trunk/src/wp-includes/compat.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpincludescompatphp"></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/compat.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/compat.php 2019-07-15 05:10:36 UTC (rev 45637)
+++ trunk/src/wp-includes/compat.php 2019-07-15 05:13:10 UTC (rev 45638)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -221,6 +221,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Compat function to mimic hash_hmac().
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * The Hash extension is bundled with PHP by default since PHP 5.1.2.
+ * However, the extension may be explicitly disabled on select servers.
+ * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
+ * longer be disabled.
+ * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
+ * and the associated `_hash_hmac()` function can be safely removed.
+ *
</ins><span class="cx" style="display: block; padding: 0 10px"> * @ignore
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.2.0
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -335,10 +342,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * Compares two strings using the same time whether they're equal or not.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Note: It can leak the length of a string when arguments of differing length are supplied.
+ *
</ins><span class="cx" style="display: block; padding: 0 10px"> * This function was added in PHP 5.6.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * However, the Hash extension may be explicitly disabled on select servers.
+ * As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
+ * longer be disabled.
+ * I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
+ * can be safely removed.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Note: It can leak the length of a string when arguments of differing length are supplied.
- *
</del><span class="cx" style="display: block; padding: 0 10px"> * @since 3.9.2
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $a Expected string.
</span></span></pre>
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