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WPDB: Always use `mysqli` when available. 

This change makes WordPress use `mysqli` on PHP <5.5 when available, instead of only in PHP 5.5+ and development installs.

WPDB includes a fallback to `mysql` in the event that the database connection fails with `mysqli` so incompatibilities should be few and far between.

Props dd32.
Merges [42388] to the 4.9 branch.
Fixes #42812.
Built from https://develop.svn.wordpress.org/branches/4.9@42455


git-svn-id: http://core.svn.wordpress.org/branches/4.9@42284 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Sergey Biryukov 2018-01-15 22:50:39 +00:00
parent 84bd75ea88
commit b6d9609fa9
1 changed files with 3 additions and 10 deletions
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13
wp-includes/wp-db.php
View File

@ -570,19 +570,12 @@ class wpdb {
if ( WP_DEBUG && WP_DEBUG_DISPLAY )
$this->show_errors();
/* Use ext/mysqli if it exists and:
* - WP_USE_EXT_MYSQL is defined as false, or
* - We are a development version of WordPress, or
* - We are running PHP 5.5 or greater, or
* - ext/mysql is not loaded.
*/
// Use ext/mysqli if it exists unless WP_USE_EXT_MYSQL is defined as true
if ( function_exists( 'mysqli_connect' ) ) {
$this->use_mysqli = true;
if ( defined( 'WP_USE_EXT_MYSQL' ) ) {
$this->use_mysqli = ! WP_USE_EXT_MYSQL;
} elseif ( version_compare( phpversion(), '5.5', '>=' ) || ! function_exists( 'mysql_connect' ) ) {
$this->use_mysqli = true;
} elseif ( false !== strpos( $GLOBALS['wp_version'], '-' ) ) {
$this->use_mysqli = true;
}
}