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<title>[27935] trunk/src/wp-includes/wp-db.php: Database: Fall back from ext/mysqli to ext/mysql if the connection fails.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/27935">27935</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2014-04-03 21:57:22 +0000 (Thu, 03 Apr 2014)</dd>
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<h3>Log Message</h3>
<pre>Database: Fall back from ext/mysqli to ext/mysql if the connection fails.
This allows us to avoid breaking a site that works under ext/mysql but is misconfigured for ext/mysqli.
props pento.
see <a href="http://core.trac.wordpress.org/ticket/21663">#21663</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludeswpdbphp">trunk/src/wp-includes/wp-db.php</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludeswpdbphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/wp-db.php (27934 => 27935)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/wp-db.php 2014-04-03 20:04:44 UTC (rev 27934)
+++ trunk/src/wp-includes/wp-db.php 2014-04-03 21:57:22 UTC (rev 27935)
</span><span class="lines">@@ -549,6 +549,15 @@
</span><span class="cx"> private $use_mysqli = false;
</span><span class="cx">
</span><span class="cx"> /**
</span><ins>+ * Whether we've managed to successfully connect at some point
+ *
+ * @since 3.9.0
+ * @access private
+ * @var bool
+ */
+ private $has_connected = false;
+
+ /**
</ins><span class="cx"> * Connects to the database server and selects a database
</span><span class="cx"> *
</span><span class="cx"> * PHP5 style constructor for compatibility with PHP5. Does
</span><span class="lines">@@ -1336,6 +1345,26 @@
</span><span class="cx">
</span><span class="cx"> if ( $this->dbh->connect_errno ) {
</span><span class="cx"> $this->dbh = null;
</span><ins>+
+ /* It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if:
+ * - We haven't previously connected, and
+ * - USE_EXT_MYSQL isn't set to false, and
+ * - ext/mysql is loaded.
+ */
+ $attempt_fallback = true;
+
+ if ( $this->has_connected ) {
+ $attempt_fallback = false;
+ } else if ( defined( 'USE_EXT_MYSQL' ) && ! USE_EXT_MYSQL ) {
+ $attempt_fallback = false;
+ } else if ( ! function_exists( 'mysql_connect' ) ) {
+ $attempt_fallback = false;
+ }
+
+ if ( $attempt_fallback ) {
+ $this->use_mysqli = false;
+ $this->db_connect();
+ }
</ins><span class="cx"> }
</span><span class="cx"> } else {
</span><span class="cx"> if ( WP_DEBUG ) {
</span><span class="lines">@@ -1367,6 +1396,7 @@
</span><span class="cx">
</span><span class="cx"> return false;
</span><span class="cx"> } else if ( $this->dbh ) {
</span><ins>+ $this->has_connected = true;
</ins><span class="cx"> $this->set_charset( $this->dbh );
</span><span class="cx"> $this->set_sql_mode();
</span><span class="cx"> $this->ready = true;
</span></span></pre>
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