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php数据入库前清理 注意php intval与mysql的int取值范围不同

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Release: 2016-06-21 08:55:58
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php保存数据到mysql
打算在dao层进行数据入库前的清理,比如varchar进行trim,int进行intval。
有一天突然想起,php intval的取值范围与mysql的int类型一样吗?
查了一下,不一样……
http://php.net/manual/en/function.intval.php
http://dev.mysql.com/doc/refman/5.1/zh/column-types.html#numeric-types
php 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 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。
所以下面的代码是错误的:

复制代码 代码如下:


public function insert($data)
{
if(isset($data['content'])&&!empty($data['content']))
{
$data_for_query['content'] = trim($data['content']);
}
else
{
return false;
}
if(isset($data['user_id'])&&!empty($data['user_id']))
{
$data_for_query['user_id'] = intval($data['user_id']);
}
else
{
return false;
}
$sql = "INSERT INTO `".$this->table_name."` (".$this->db->implodeToColumn(array_keys($data_for_query)).") VALUES (".$this->db->implodeToValues(array_values($data_for_query)).")";
$this->db->query($sql);
$id = $this->db->lastInsertId();
if(empty($id))
{
return false;
}
else
{
return $id;
}
}


解决办法:还在想,准备用正则表达式。



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