src/Utils/Str.php
public static function decamelize($value)
    {
        if (isset(self::$decamelized[$value])) {
            return self::$decamelized[$value];
        }

        return self::$decamelized[$value] = strtolower(preg_replace('/(.)(?=[A-Z])/u', '$1_', $value));
    }
public static function decamelize($value)
    {
        if (isset(self::$decamelized[$value])) {
            return self::$decamelized[$value];
        }

        return self::$decamelized[$value] = strtolower(preg_replace('/(.)(?=[A-Z])/u', '$1_', $value));
    }
public static function decamelize ( $ value ) { if ( isset ( self :: $ decamelized [ $ value ] ) ) { return self :: $ decamelized [ $ value ] ; } return self :: $ decamelized [ $ value ] = strtolower ( preg_replace ( '/(.)(?=[A-Z])/u' , '$1_' , $ value ) ) ; }
Converts a camel case string into all lower case separated by underscores.

@param string $value
@return string
Converts a camel case string into all lower case separated by underscores .