mysql int取值范围与php intval区别
php教程 intval的取值范围：与操作系统相关，32位系统上为-2147483648到2147483647，64位系统上为-9223372036854775808到9223372036854775807。
mysql教程 int取值范围：与操作系统无关，为-2147483648到2147483647，无符号为0到4294967295。
mysql bigint取值范围：与操作系统无关，为-9223372036854775808到9223372036854775807，无符号为0到18446744073709551615。
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