哪个MySQL排序规则与PHP的字符串比较完全匹配? [英] Which MySQL collation exactly matches PHP's string comparison?
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问题描述
这是一个MySQL查询:
Here is a MySQL query:
SELECT last_name FROM users ORDER BY last_name
我们将所有数据导入PHP,然后运行:
We get all that data into PHP and then run:
$prior = NULL;
do {
$current = array_shift($results);
assert($current >= $prior);
$prior = $current;
} while ($current !== NULL);
目前此声明对某些输入失败。是否可以在上面的MySQL查询中添加一个COLLATE子句,以绝对保证PHP断言?
Currently this assertion fails for certain inputs. Is it possible to add a COLLATE clause to the MySQL query above to absolutely guarantee that PHP assertion?
- The above code, it doesn't work for certain non-ASCII inputs
ORDER BY email COLLATE utf8_bin
resulted inCOLLATION 'utf8_bin' is not valid for CHARACTER SET 'latin1'
- Maybe this is a duplicate of What is the best collation to use for MySQL with PHP? but that seemed more subjective, I am seeking a specific answer to a specific problem
其他说明:
- 是
latin1
- 我的PHP PDO包装库是 https://github.com/fulldecent/thin-pdo
- If it makes a difference, this column is
latin1
- My PHP PDO wrapper library is https://github.com/fulldecent/thin-pdo
推荐答案
echo ('a' == 'A') ? 'a==A ' : 'a <> A ';
echo ('a' == 'á') ? 'a==á ' : 'a <> á ';
两个回来<>
所以我推断,PHP的行为像 latin1_bin
(或 _bin
无论你有什么字符集)。
Both came back <>
, so I deduce that PHP acts like latin1_bin
(or the _bin
of whatever charset you have).
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