Mostly, unique strings follow a certain sequence. What is a unique string?A unique string is a string that stands out from other strings, for example, your ID number or passport number is unique and distinct such that while it’s being created there has to be some check not to duplicate. What is a random string?A random string is a string that does not follow any order or sequence, that is, given a set of numbers or letters it shuffles it in any direction and any order An example of an alphanumeric string is A0Bx3EewK2 What is an alphanumeric string?Īn alphanumeric string is a string that contains both numbers (0 to 9) and alphabet letters (A to Z) both uppercase and lowercase. PHP provides various inbuilt functions that help us achieve how to generate unique random strings. Therefore, in this article, we shall focus on how to generate an alphanumeric string using PHP, how to generate a random string using PHP, how to generate a unique string using PHP, and show examples of how this is done. Also, during forgot or reset password, a code is sent to your email to confirm whether you are truly the owner of the account.Īll of the above scenarios follow the procedure of generating either an alphanumeric random and unique string which is simply easy to achieve while using the PHP language. Another scenario is when you are signing up to a certain application and you are not requested for the password, a password is sent to your email or through SMS which you are required to change whenever you log in for the first time. This code generation either follows a certain sequence or is sometimes random. All those functions will be used, but only in a different sequence.Īs a last option, I will provide you with two of my functions that can generate a string of the length that we want.įirst function.Mostly while using different applications daily we sometimes come across a situation where we are required to input a code sent either to your email or mobile phone which either comprises of four or five or six characters or numbers that expires after a certain period of from one minute to sixty minutes or up to twenty-four hours. The next three options are very similar to the previous option for getting a string. ![]() As a final step, we pass this hash of the string to the substr function, which will truncate the string to the length we want by passing in the second parameter, length. ![]() In the next step, we pass this set of numbers to the md5 function, which forms the hash of the string. We first get a set of digits by calling the time function which returns the number of seconds since the Unix epoch. The next option to generate a unique string, we will use already three functions, substr, md5 and time. The bin2hex function is designed to convert binary data to a hexadecimal representation, that is, to a regular string. After generating a string in bytes by a further action, this string must be passed to the bin2hex function. In the following example, we will use two functions, random_bytes and bin2hex, to generate a unique string.įirst, the random_bytes function generates cryptographically pseudo-random bytes, the function takes a mandatory length parameter, that is, the length of the generated string in bytes. We've called the uniqid function twice, resulting in two unique strings. This function has two optional parameters that can be passed, but in order for us to generate a unique string, we can additionally not pass anything. The uniqid function generates a unique string based on getting the current time in microseconds. In the very first option, we will use the uniqid function. There are a lot of options in PHP for how to generate a unique string, and I will show you the most common options that developers use. One example where you will need to generate a unique string is a cookie for users who register on your site, and this cookie will be used by the user each time they log in. In today's article, we'll talk about how to generate a unique string in PHP.Īlmost always in your developments you will encounter the fact that you need to generate a unique string of a certain length, and there are a lot of examples of this.
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