Home Database Mysql Tutorial mysql_real_escape_string和addslashes的区别

mysql_real_escape_string和addslashes的区别

Jun 07, 2016 pm 05:51 PM

本文章详细的以实例和php手册详细的介绍了关于mysql_real_escape_string和addslashes的区别。

说明string mysql_real_escape_string ( string $unescaped_string [, resource $link_identifier ] )

本函数将 中的特殊字符转义,并计及连接的当前字符集,因此可以安全用于 mysql_query()。

Note: mysql_real_escape_string() 并不转义 和 。

Example #1 mysql_real_escape_string() 例子

 代码如下 复制代码
$item = "Zak’s and Derick’s Laptop";
$escaped_item = mysql_real_escape_string($item);
printf ("Escaped string: %sn", $escaped_item);
?>

以上例子将产生如下输出:

Escaped string: Zak’s and Derick’s Laptop
参见

mysql_escape_string() 和 mysql_character_set_name()。


网站分享的关于 addslashes与mysql_real_escape_string的区别

 

 代码如下 复制代码
if (!get_magic_quotes_gpc()) {
$lastname = addslashes($_POST[‘lastname’]);
} else {
$lastname = $_POST[‘lastname’];
}

最好对magic_quotes_gpc已经开放的情况下,还是对$_POST[’lastname’]进行检查一下。

再说下mysql_real_escape_string和mysql_escape_string这2个函数的区别:
mysql_real_escape_string 必须在(PHP 4 >= 4.3.0, PHP 5)的情况下才能使用。否则只能用 mysql_escape_string ,两者的区别是:
mysql_real_escape_string 考虑到连接的当前字符集,而mysql_escape_string 不考虑


手册上addslashes转义的字符是单引号(')、双引号(")、反斜线()与NUL(NULL 字符)。

mysql_real_escape_string转义的字符并没有被提到.只是说了一句

注意: mysql_real_escape_string() 并不转义% 和_。

为什么PHP手册没有说呢?因为其实这是个MySql的C的API.所以我们需要查下MySql手册..上面是这么说的.

编码的字符为NUL (ASCII 0)、'n'、'r'、''、'''、'"'、以及Control-Z(请参见9.1节,“文字值”)。(严格地讲,MySQL仅需要反斜杠和引号字符,用于引用转义查询中的字符串。该函数能引用其他字符,从而使得它们在日志文件中具有更好的可读性)。


总结:

* addslashes() 是强行加;
* mysql_real_escape_string()  会判断字符集,但是对PHP版本有要求;
* mysql_escape_string不考虑连接的当前字符集。

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