When trying to determine whether a variable is set, it’s also better to forego the PHP STRLEN function and simply use the ISSET function. But note that many programs rely on STRLEN because it’s been in use for some time and because MB_STRLEN wasn’t introduced until PHP4. In general, MB_STRLEN is considered the correct way to count strings, whereas STRLEN is now considered somewhat deprecated. It’s used the same way as STRLEN, except there’s an additional parameter called “encoding.” The additional encoding parameter tells the compiler what type of string is being counted. MB_STRLEN is the most commonly used alternative to PHP STRLEN. So, let’s replace the “Hello, world!” text, which we know has 13 characters, with “Hellö, wörld!”: For instance, a u with an umlaut ü is going to count as two characters. Nearly always, that’s going to be the number of characters in the string.īut an issue occurs when you use UTF-8 characters, which will count as multiple characters. That’s technically true, but more specifically, it returns the number of bytes. Issues with the PHP STRLEN functionĮarlier, we said that this function returns the number of characters. Otherwise, your database entry will fail. If you’re entering an email address into a database and the database can only contain CHAR(50), you need to make sure the email address is less than 50 characters. You can make sure the path, domain, and other arguments aren’t too long before sending them in.įinally, PHP STRLEN is frequently used when validating entries into a database, such as a MySQL database. For instance, the PHP SETCOOKIE function sets a cookie on a user’s device, but you don’t want to send a lot of garbage to the cookie. You can validate arguments before sending them to other functions. ![]() This doesn’t print anything, but it does store the STRLEN string’s length into the variable $string_length for use later.Īs you can see, it’s easy to identify whether the meta description is the correct length using the STRLEN function. You could also save the number of characters to a variable, like so: The STRLEN string can also pass as a variable: Īnd since the PHP STRLEN function has a function return and returns the number, you don’t need to print the STRLEN. So, you use STRLEN any time you need the length of a string. The built-in function PHP STRLEN returns the number of characters in the string. ![]() So, the PHP string “Hello, World!” is an array of 13 characters, starting with the number 0. PHP strings, like most code strings, are really arrays. In PHP, the STRLEN function will simply return the length of a string. Today, we’re going to look at the PHP STRLEN function, when you would use it, and what other functions you might need to use to manipulate strings in PHP. Have you ever needed to get the length of a string? PHP makes the process of getting string length easy with the PHP STRLEN (PHP string length) function.
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