Yii2.0自增主键查询老是字符串的原因剖析

    /**
     * Extracts the PHP type from abstract DB type.
     * @param ColumnSchema $column the column schema information
     * @return string PHP type name
     */
    protected function getColumnPhpType($column)
    {
        static $typeMap = [
            // abstract type => php type
            self::TYPE_TINYINT => ‘integer‘,
            self::TYPE_SMALLINT => ‘integer‘,
            self::TYPE_INTEGER => ‘integer‘,
            self::TYPE_BIGINT => ‘integer‘,
            self::TYPE_BOOLEAN => ‘boolean‘,
            self::TYPE_FLOAT => ‘double‘,
            self::TYPE_DOUBLE => ‘double‘,
            self::TYPE_BINARY => ‘resource‘,
            self::TYPE_JSON => ‘array‘,
        ];
        if (isset($typeMap[$column->type])) {
            if ($column->type === ‘bigint‘) {
                return PHP_INT_SIZE === 8 && !$column->unsigned ? ‘integer‘ : ‘string‘; // 这里决定字段类型
            } elseif ($column->type === ‘integer‘) {
                return PHP_INT_SIZE === 4 && $column->unsigned ? ‘string‘ : ‘integer‘; // 这里决定字段类型
            }

            return $typeMap[$column->type];
        }

        return ‘string‘;
    }