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Database: Don't force an unsupported character set that previously would've silently failed. 

[37320] corrected some behaviour in how PHP and MySQL character sets are matched up. This was correct, but had the side effect of causing some incorrectly configured sites to start failing.

Prior to [37320], if `DB_CHARSET` was set to `utf8mb4`, but the PHP version didn't support `utf8mb4`, it would fall back to the default character set - usually `latin1`. After [37320], the `SET NAMES` query would force MySQL to treat the connection character set as `utf8mb4`, even if PHP wasn't able to understand it.

By checking if `mysqli_set_charset()` succeeded, we can simulate the old behaviour, while maintaining the fix in [37320].

Merge of [38441] to the 4.6 branch.

Props danielkanchev fo helping to diagnose this issue.
Fixes #37689.


Built from https://develop.svn.wordpress.org/branches/4.6@38442


git-svn-id: http://core.svn.wordpress.org/branches/4.6@38383 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast 2016-08-30 07:42:49 +00:00
parent 1b8d23ca29
commit 33c1c022e3
2 changed files with 18 additions and 11 deletions
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2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.6.1-alpha-38440';
$wp_version = '4.6.1-alpha-38442';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

27
wp-includes/wp-db.php
View File

@ -811,22 +811,29 @@ class wpdb {
if ( ! isset( $collate ) )
$collate = $this->collate;
if ( $this->has_cap( 'collation' ) && ! empty( $charset ) ) {
$set_charset_succeeded = true;
if ( $this->use_mysqli ) {
if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
mysqli_set_charset( $dbh, $charset );
$set_charset_succeeded = mysqli_set_charset( $dbh, $charset );
}
if ( $set_charset_succeeded ) {
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) )
$query .= $this->prepare( ' COLLATE %s', $collate );
mysqli_query( $dbh, $query );
}
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) )
$query .= $this->prepare( ' COLLATE %s', $collate );
mysqli_query( $dbh, $query );
} else {
if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
mysql_set_charset( $charset, $dbh );
$set_charset_succeeded = mysql_set_charset( $charset, $dbh );
}
if ( $set_charset_succeeded ) {
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) )
$query .= $this->prepare( ' COLLATE %s', $collate );
mysql_query( $query, $dbh );
}
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) )
$query .= $this->prepare( ' COLLATE %s', $collate );
mysql_query( $query, $dbh );
}
}
}