You are mixing APIs here, mysql_* and mysqli_* doesn't mix. You should stick with mysqli_ (as it seems you are anyway), as mysql_* functions are deprecated, and removed entirely in PHP7.
Your actual issue is a charset problem somewhere. Here's a few pointers which can help you get the right charset for your application. This covers most of the general problems one can face when developing a PHP/MySQL application.
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ALL attributes throughout your application must be set to UTF-8
- Save the document as UTF-8 w/o BOM (If you're using Notepad++, it's
Format -> Convert to UTF-8 w/o BOM)
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The header in both PHP and HTML should be set to UTF-8
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HTML (inside <head></head> tags):
<meta charset="UTF-8">
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PHP (at the top of your file, before any output):
header('Content-Type: text/html; charset=utf-8');
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Upon connecting to the database, set the charset to UTF-8 for your connection-object, like this (directly after connecting)
mysqli_set_charset($conn, "utf8"); /* Procedural approach */
$conn->set_charset("utf8"); /* Object-oriented approach */
This is for mysqli_*, there are similar ones for mysql_* and PDO (see bottom of this answer).
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Also make sure your database and tables are set to UTF-8, you can do that like this:
ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
(Any data already stored won't be converted to the proper charset, so you'll need to do this with a clean database, or update the data after doing this if there are broken characters).
- If you're using
json_encode(), you might need to apply the JSON_UNESCAPED_UNICODE flag, otherwise it will convert special characters to their hexadecimal equivalent.
Remember that EVERYTHING in your entire pipeline of code needs to be set to UFT-8, otherwise you might experience broken characters in your application.
In addition to this list, there may be functions that has a specific parameter for specifying a charset. The manual will tell you about this (an example is htmlspecialchars()).
There are also special functions for multibyte characters, example: strtolower() won't lower multibyte characters, for that you'll have to use mb_strtolower(), see this live demo.
Note 1: Notice that its someplace noted as utf-8 (with a dash), and someplace as utf8 (without it). It's important that you know when to use which, as they usually aren't interchangeable. For example, HTML and PHP wants utf-8, but MySQL doesn't.
Note 2: In MySQL, "charset" and "collation" is not the same thing, see Difference between Encoding and collation?. Both should be set to utf-8 though; generally collation should be either utf8_general_ci or utf8_unicode_ci, see UTF-8: General? Bin? Unicode?.
Note 3: If you're using emojis, MySQL needs to be specified with an utf8mb4 charset instead of the standard utf8, both in the database and the connection. HTML and PHP will just have UTF-8.
Setting UTF-8 with mysql_ and PDO
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PDO: This is done in the DSN of your object. Note the charset attribute,
$pdo = new PDO("mysql:host=localhost;dbname=database;charset=utf8", "user", "pass");
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mysql_: This is done very similar to mysqli_*, but it doesn't take the connection-object as the first argument.
mysql_set_charset('utf8');
