If you want to delete multiple array elements and don’t want to call unset() or \array_splice() multiple times you can use the functions \array_diff() or \array_diff_key() depending on whether you know the values or the keys of the elements which you want to delete. You don’t assign the return values of those functions back to the array. \array_splice() needs the offset, not the key, as the second parameter.Īrray_splice(), same as unset(), take the array by reference. If you use \array_splice() the keys will automatically be reindexed, but the associative keys won’t change - as opposed to \array_values(), which will convert all keys to numerical keys. If you want to reindex the keys you can use \array_values() after unset(), which will convert all keys to numerically enumerated keys starting from 0.Ĭode: $array = Note that when you use unset() the array keys won’t change. This only works if the element does not occur more than once, since \array_search returns the first hit only. If you know the value and don’t know the key to delete the element you can use \array_search() to get the key. If you want to delete just one array element you can use unset() or alternatively \array_splice(). There are different ways to delete an array element, where some are more useful for some specific tasks than others. Check out any of the links from for some good resources to learn everything you need to know. To know what you're doing (read: not mess it up), you really need to know UTF-8 and how it works on the lowest possible level. There are some things you can safely do with normal PHP string operations (like concatenation), but for most things you should use the equivalent mbstring function. PHP's built-in string operations are not by default UTF-8 safe. You'll probably want to make extensive use of PHP's mbstring extension. You need to make sure that every time you process a UTF-8 string, you do so safely. Obviously enough, all files you'll be serving (PHP, HTML, JavaScript, etc.) should be encoded in valid UTF-8. For HTML before HTML5 only: note that the W3C HTML spec says that clients "should" default to sending forms back to the server in whatever charset the server served, but this is apparently only a recommendation, hence the need for being explicit on every single tag. Unfortunately, if you go by the only way to reliably do this is add the accept-charset attribute to all your tags. For HTML before HTML5 only: you want all data sent to you by browsers to be in UTF-8.However, if you're targeting older versions of HTML (XHTML, HTML4, etc.), these points may still be useful: My understanding is that browsers will work with and submit data in the character set specified for the document. There's really no way around this, as malicious clients can submit data in whatever encoding they want, and I haven't found a trick to get PHP to do this for you reliably.įrom my reading of the current HTML spec, the following sub-bullets are not necessary or even valid anymore for modern HTML. PHP's mb_check_encoding() does the trick, but you have to use it religiously. Unfortunately, you should verify every received string as being valid UTF-8 before you try to store it or use it anywhere. When encoding the output using json_encode(), add JSON_UNESCAPED_UNICODE as a second parameter. In PHP, you can use the default_charset php.ini option, or manually issue the Content-Type MIME header yourself, which is just more work but has the same effect. With web applications, the browser must be informed of the encoding in which data is sent (through HTTP response headers or HTML metadata). If your application transmits text to other systems, they will also need to be informed of the character encoding. The same consideration regarding utf8mb4/ utf8 applies as above. If the driver does not provide its own mechanism for setting the connection character set, you may have to issue a query to tell MySQL how your application expects data on the connection to be encoded: SET NAMES 'utf8mb4'. If you're stuck with plain mysql but happen to be running PHP ≥ 5.2.3, you can call mysql_set_charset. Mysqli_set_charset($link, 'utf8mb4') // procedural style In older versions of MySQL (set_charset('utf8mb4') // object oriented style Note that MySQL will implicitly use utf8mb4 encoding if a utf8mb4_* collation is specified (without any explicit character set). This makes MySQL physically store and retrieve values encoded natively in UTF-8. Specify the utf8mb4 character set on all tables and text columns in your database.
0 Comments
Leave a Reply. |