February 12, 2011 
Definition:
function get_locale() {}
Gets the current locale.
If the locale is set, then it will filter the locale in the ‘locale’ filter hook and return the value.
Return values
returns:The locale of the blog or from the ‘locale’ hook.
Defined filters
- locale
apply_filters( 'locale', $locale ) - locale
apply_filters( 'locale', $locale )
Source code
function get_locale() {
global $locale;
if ( isset( $locale ) )
return apply_filters( 'locale', $locale );
// WPLANG is defined in wp-config.
if ( defined( 'WPLANG' ) )
$locale = WPLANG;
// If multisite, check options.
if ( is_multisite() ) {
// Don't check blog option when installing.
if ( defined( 'WP_INSTALLING' ) || ( false === $ms_locale = get_option( 'WPLANG' ) ) )
$ms_locale = get_site_option('WPLANG');
if ( $ms_locale !== false )
$locale = $ms_locale;
}
if ( empty( $locale ) )
$locale = 'en_US';
return apply_filters( 'locale', $locale );
}
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A HitchHackers guide through WordPress 
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