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<title>[33309] branches/4.2: WPDB: Remove some of the complexities in `::strip_invalid_text()` associated with switching character sets between queries.</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/33309">33309</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/33309","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>2015-07-17 06:37:40 +0000 (Fri, 17 Jul 2015)</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'>WPDB: Remove some of the complexities in `::strip_invalid_text()` associated with switching character sets between queries. Instead of trying to dynamically change connection character sets, we now rely on the value of `::charset`. This also fixes the case where queries were being blocked when `DB_CHARSET` was `utf8`, but the column character set was non-`utf8`.

Merge of <a href="https://core.trac.wordpress.org/changeset/33308">[33308]</a> to the 4.2 branch.

Fixes <a href="https://core.trac.wordpress.org/ticket/32165">#32165</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branches42srcwpincludeswpdbphp">branches/4.2/src/wp-includes/wp-db.php</a></li>
<li><a href="#branches42testsphpunittestsdbcharsetphp">branches/4.2/tests/phpunit/tests/db/charset.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branches42srcwpincludeswpdbphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.2/src/wp-includes/wp-db.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.2/src/wp-includes/wp-db.php    2015-07-17 06:33:36 UTC (rev 33308)
+++ branches/4.2/src/wp-includes/wp-db.php      2015-07-17 06:37:40 UTC (rev 33309)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2675,55 +2675,37 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $queries = array();
</span><span class="cx" style="display: block; padding: 0 10px">                        foreach ( $data as $col => $value ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                if ( ! empty( $value['db'] ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        if ( ! isset( $queries[ $value['charset'] ] ) ) {
-                                               $queries[ $value['charset'] ] = array();
-                                       }
-
</del><span class="cx" style="display: block; padding: 0 10px">                                         // We're going to need to truncate by characters or bytes, depending on the length value we have.
</span><span class="cx" style="display: block; padding: 0 10px">                                        if ( 'byte' === $value['length']['type'] ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                // Split the CONVERT() calls by charset, so we can make sure the connection is right
-                                               $queries[ $value['charset'] ][ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING binary ), %.0f ) USING {$value['charset']} )", $value['value'], $value['length']['length'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         // Using binary causes LEFT() to truncate by bytes.
+                                               $charset = 'binary';
</ins><span class="cx" style="display: block; padding: 0 10px">                                         } else {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                $queries[ $value['charset'] ][ $col ] = $this->prepare( "LEFT( CONVERT( %s USING {$value['charset']} ), %.0f )", $value['value'], $value['length']['length'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         $charset = $value['charset'];
</ins><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">+                                        $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), %.0f ) USING {$this->charset} )", $value['value'], $value['length']['length'] );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                                         unset( $data[ $col ]['db'] );
</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><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $connection_charset = $this->charset;
-                       foreach ( $queries as $charset => $query ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $sql = array();
+                       foreach ( $queries as $column => $query ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 if ( ! $query ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                        continue;
</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">-                                // Change the charset to match the string(s) we're converting
-                               if ( $charset !== $connection_charset ) {
-                                       $connection_charset = $charset;
-                                       $this->set_charset( $this->dbh, $charset );
-                               }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $sql[] = $query . " AS x_$column";
+                       }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                $this->check_current_query = false;
-
-                               $sql = array();
-                               foreach ( $query as $column => $column_query ) {
-                                       $sql[] = $column_query . " AS x_$column";
-                               }
-
-                               $row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A );
-                               if ( ! $row ) {
-                                       $this->set_charset( $this->dbh, $connection_charset );
-                                       return new WP_Error( 'wpdb_strip_invalid_text_failure' );
-                               }
-
-                               foreach ( array_keys( $query ) as $column ) {
-                                       $data[ $column ]['value'] = $row["x_$column"];
-                               }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->check_current_query = false;
+                       $row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A );
+                       if ( ! $row ) {
+                               return new WP_Error( 'wpdb_strip_invalid_text_failure' );
</ins><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">-                        // Don't forget to change the charset back!
-                       if ( $connection_charset !== $this->charset ) {
-                               $this->set_charset( $this->dbh );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 foreach ( array_keys( $data ) as $column ) {
+                               $data[ $column ]['value'] = $row["x_$column"];
</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></div>
<a id="branches42testsphpunittestsdbcharsetphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.2/tests/phpunit/tests/db/charset.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.2/tests/phpunit/tests/db/charset.php   2015-07-17 06:33:36 UTC (rev 33308)
+++ branches/4.2/tests/phpunit/tests/db/charset.php     2015-07-17 06:37:40 UTC (rev 33309)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -244,6 +244,27 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                'expected' => str_repeat( "\xcc\xe3", 5 ),
</span><span class="cx" style="display: block; padding: 0 10px">                                'length'   => array( 'type' => 'byte', 'length' => 10 ),
</span><span class="cx" style="display: block; padding: 0 10px">                        ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'ujis_with_utf8_connection' => array(
+                               'charset'            => 'ujis',
+                               'connection_charset' => 'utf8',
+                               'value'              => '自動下書き',
+                               'expected'           => '自動下書き',
+                               'length'             => array( 'type' => 'byte', 'length' => 100 ),
+                       ),
+                       'ujis_with_utf8_connection_char_length' => array(
+                               'charset'            => 'ujis',
+                               'connection_charset' => 'utf8',
+                               'value'              => '自動下書き',
+                               'expected'           => '自動下書',
+                               'length'             => array( 'type' => 'char', 'length' => 4 ),
+                       ),
+                       'ujis_with_utf8_connection_byte_length' => array(
+                               'charset'            => 'ujis',
+                               'connection_charset' => 'utf8',
+                               'value'              => '自動下書き',
+                               'expected'           => '自動',
+                               'length'             => array( 'type' => 'byte', 'length' => 6 ),
+                       ),
</ins><span class="cx" style="display: block; padding: 0 10px">                         'false' => array(
</span><span class="cx" style="display: block; padding: 0 10px">                                // false is a column with no character set (ie, a number column)
</span><span class="cx" style="display: block; padding: 0 10px">                                'charset'  => false,
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -289,7 +310,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                foreach ( $fields as $test_case => $field ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $expected = $field;
</span><span class="cx" style="display: block; padding: 0 10px">                        $expected['value'] = $expected['expected'];
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        unset( $expected['expected'], $field['expected'] );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 unset( $expected['expected'], $field['expected'], $expected['connection_charset'] );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // We're keeping track of these for our multiple-field test.
</span><span class="cx" style="display: block; padding: 0 10px">                        $multiple[] = $field;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -303,9 +324,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $data_provider[] = array( $data, $expected, $test_case );
</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">-                // Time for our test of multiple fields at once.
-               $data_provider[] = array( $multiple, $multiple_expected, 'multiple fields/charsets' );
-
</del><span class="cx" style="display: block; padding: 0 10px">                 return $data_provider;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -318,7 +336,22 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->markTestSkipped( 'This test fails in PHP 5.2 on Windows. See https://core.trac.wordpress.org/ticket/31262' );
</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">+                $charset = self::$_wpdb->charset;
+               if ( isset( $data[0]['connection_charset'] ) ) {
+                       $new_charset = $data[0]['connection_charset'];
+                       unset( $data[0]['connection_charset'] );
+               } else {
+                       $new_charset = $data[0]['charset'];
+               }
+
+               self::$_wpdb->charset = $new_charset;
+               self::$_wpdb->set_charset( self::$_wpdb->dbh, $new_charset );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $actual = self::$_wpdb->strip_invalid_text( $data );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+               self::$_wpdb->charset = $charset;
+               self::$_wpdb->set_charset( self::$_wpdb->dbh, $charset );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->assertSame( $expected, $actual, $message );
</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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