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<title>[53812] trunk/src/wp-admin/setup-config.php: Database: Suppress errors when checking the validity of table prefix during installation.</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/53812">53812</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/53812","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>2022-08-02 16:33:00 +0000 (Tue, 02 Aug 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'>Database: Suppress errors when checking the validity of table prefix during installation.
There are some table prefixes (for example, `7e1_`), which the database will try and parse as values unless they are quoted in backticks. Because not everyone remembers to quote their table names, WordPress discourages use of such prefixes during setup.
To test if the table prefix is valid, WordPress executes a query deliberately trying to generate an error:
> `Unknown column 'wp_' in 'field list'`
which means the prefix is safe to use, as the database was not able to parse it as a value.
Previously, this error would not be displayed to the user in a typical configuration, but would be logged on the server via `wpdb::print_error()`, and in some cases could block the installation.
This commit makes sure the error is still checked to display a proper message in case the prefix needs to be edited, but otherwise is silently discarded instead of being logged.
Follow-up to <a href="https://core.trac.wordpress.org/changeset/37581">[37581]</a>, <a href="https://core.trac.wordpress.org/changeset/41631">[41631]</a>, <a href="https://core.trac.wordpress.org/changeset/51582">[51582]</a>.
Props pento, lazam786, Velochicdunord, irecinius, mikemanzo, dd32, blackawxs, codewhy, psykro, burgiuk, mdrago, maythamalsudany, peterwilsoncc, sumitsingh, deksar, SergeyBiryukov.
Fixes <a href="https://core.trac.wordpress.org/ticket/42362">#42362</a>.</pre>
<h3>Modified Paths</h3>
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<li><a href="#trunksrcwpadminsetupconfigphp">trunk/src/wp-admin/setup-config.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpadminsetupconfigphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/setup-config.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/setup-config.php 2022-08-02 14:48:51 UTC (rev 53811)
+++ trunk/src/wp-admin/setup-config.php 2022-08-02 16:33:00 UTC (rev 53812)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -311,9 +311,10 @@
</span><span class="cx" style="display: block; padding: 0 10px"> wp_die( $wpdb->error->get_error_message() . $tryagain_link );
</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">- $errors = $wpdb->hide_errors();
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $errors = $wpdb->suppress_errors();
</ins><span class="cx" style="display: block; padding: 0 10px"> $wpdb->query( "SELECT $prefix" );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $wpdb->show_errors( $errors );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $wpdb->suppress_errors( $errors );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( ! $wpdb->last_error ) {
</span><span class="cx" style="display: block; padding: 0 10px"> // MySQL was able to parse the prefix as a value, which we don't want. Bail.
</span><span class="cx" style="display: block; padding: 0 10px"> wp_die( __( '<strong>Error:</strong> "Table Prefix" is invalid.' ) );
</span></span></pre>
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