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The PHP random string generation won’t require anything except for the calls to some
extraordinary functions. So, you can have tons of random strings by passing a little information to the said functions. And this article has been written to provide you with a list of random string generators to give you enough space to make a choice.
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Keep reading to unlock some incredible random string generators that will make your programming life easier.
How To Generate a Random String in PHP
You can use various functions to generate random strings because of their amazing functionalities. But you can’t also deny the fact that your requirements matter the most. So, here is the list of built-in and user-defined functions that will help you in different random string generation processes:
All of the above-stated solutions have been discussed in detail to help you choose a PHP random string generator that suits the best to your needs. Now, whether you are concerned about the random string length, characters, or even security, you have got all the solutions in one place. Here you go:
– Use str_shuffle as a Shuffling Box
The str_shuffle() function is more like a shuffling box that shuffles the characters in the provided string to PHP create random string. So, if your program requirement resembles a functionality similar to the one stated above, then use this syntax: str_shuffle(string).
– Word Guessing Game Coding Example
Suppose you want to create a gaming program that displays the shuffled words. In return, the users will have to recreate sensible words from the given shuffled words. Here, you’ll use the str_shuffle() function to PHP create random string. Next, you’ll take the inputs from the users and check if the users’ answers match with the original words.
Later, you’ll print a message showing the result as represented in the code snippet below:
– Limitations of the str_shuffle Function
Although the str_shuffle() function shuffles the strings well, you can’t have a shuffled string that is longer than the original string. Moreover, the shuffled strings obtained through the same function aren’t cryptographically secure.
Shuffle and Elongate the String
Do you want to shuffle a specific string and generate a longer PHP random string from the same? However, there isn’t any built-in function for achieving such kind of functionality. But what isn’t possible if a developer creates the logic well? So, you’ll need to create a user-defined function that accepts your required string and length.
Next, the given function will use the for loop and the mt_rand() function to get random characters from the string that was passed as an argument. Later, all the randomly extracted characters will be added to PHP create random string. Lastly, the stated function will return a PHP random string.
– Coding Example
For instance, you want to PHP create random strings of varying lengths from a specified set of characters. In this case, you’ll define and implement the function mentioned above to get your desired results like the code shared below:
PHP Generate Random Alphanumeric String
Have you already prepared a string of valid characters to use the same in random string generation? Well, there is a user-defined function that has been defined to meet your requirements. The said function asks for only the expected length of the PHP random string. Next, it uses the for loop and the mt_rand function to generate a random string from a predefined set of characters.
The only difference between the user-defined “random_string()” function stated above and the currently stated one is that the latter function works with only a predefined set of characters.
– Coding Example
For instance: you have made a custom set of valid characters. Now, you want your users to enter only the expected length of a PHP random string. Here, you’ll create a text box to accept the length of the PHP random string and a submit button. Next, you’ll define a function as instructed above. Later, you’ll call the function with the length submitted by the user.
Here is a code representation to help you in creating a random string generator program that accepts lengths:
<!– creating a form –>
PHP Random String With a Prefix
Certainly, there is a way out if you don’t have any extra specifications other than a particular prefix to attach to a PHP random string. The built-in uniqid() function is a great PHP random string generator that allows you to add a prefix in the newly-generated string. The stated function creates a random string as per the current time calculated in microseconds. Similar to the str_shuffle() function, the uniqid() function doesn’t generate strings that can be used in cryptography as the resulting strings aren’t secure.
– Get Started With uniqid()
The uniqid() function doesn’t accept any arguments in the first place. However, you can pass the two optional parameters: “prefix” and “more_entropy” to the mentioned function to increase the uniqueness of the PHP random string. It is because the constantly changing time makes it difficult for the uniqid() function to produce unique values at all times.
You will find this syntax helpful:
In the above syntax, you can specify any prefix as per your need and set the more_entropy parameter to true to ensure a unique PHP random string.
– Coding Example
Imagine that you want to create multiple random strings. Also, you want to add the prefix “std_” before every random string. Here, you’ll use the for loop and the uniqid() function by passing the “std_” prefix and turning on the more_entropy parameter. Consequently, you’ll get various unique values with the same prefix in no time.
Please have a look at this code fragment that depicts the above scenario in an understandable way:
Here is the result:
Implode() Function Helps in Creating PHP Random String
Another way to get a PHP random string is by converting an array into a string. Certainly, you can use the implode() function to convert an array into a string. Consequently, you’ll have a PHP random string that won’t resemble any other string until and unless the same array is converted again.
Here is the syntax:
– Coding Example
For instance, you have an array of strings and now, you want a PHP random string. You’ll utilize the implode() function to convert the array into a string. Plus, you’ll use the str_shuffle() function to shuffle the newly-created string and increase randomness similar to the code fragment shared below:
Create a Secure PHP Random String
Certainly, you can have a PHP random string that is cryptographically secure. And surprisingly, PHP provides two built-in functions to deal with random string generation while prioritizing security. Therefore, the two wonderful functions are random_bytes() and openssl_random_pseudo_bytes().
Now, if you are using PHP version 7, then opt for the random_bytes() function. But if you are using a PHP version below 7 but greater than or equal to 5.3.0, then the openssl_random_pseudo_bytes() function will work fine for you.
– Create a Secure Random String in PHP 7
The random_bytes() function accepts the required length of the PHP random string and returns a secure random string of bytes. Next, you can convert the bytes string to a hexadecimal string by using the bin2hex() function like the code snippet shared here:
– Generate a Secure Random String in PHP >= 5.3.0:
The openssl_random_pseudo_bytes() function accepts the expected length of the PHP random string that you want to generate. Moreover, the said function accepts any variable name and treats it as true to allow you to confirm the use of a cryptographically strong algorithm. In the end, you’ll get a secure random string of bytes that can be converted similar to the one generated through the random_bytes() function.
Please have a look at the coding example attached below:
Indeed, the above article is a blend of built-in, user-defined, cryptographically-secure, and usual functions that help in PHP random string generation. Now, it depends on your requirements and preference to use any of the above functions in your PHP program. Still, if you need more clarity and a quick revision, then here is a list of points to summarize the above discussion:
How to generate random characters PHP?
Generating Random Numbers in PHP. There are three different functions for generating random numbers in PHP. All of them will accept a minimum and maximum possible value for the random numbers and output a random number for you. These are rand($min, $max) , mt_rand($min, $max) , and random_int($min, $max) .
How to generate unique string in PHP?
PHP recommends using openssl_random_pseudo_bytes() instead to generate cryptographically secure tokens. which will generate a random string of alphanumeric characters of length = $bytes * 2.
What is Mt_rand function in PHP?
The mt_rand() function is a drop-in replacement for the older rand(). It uses a random number generator with known characteristics using the » Mersenne Twister, which will produce random numbers four times faster than what the average libc rand() provides.
How do you generate random unique alphanumeric strings in laravel?
If you need to generate unique random string then you can use str_random() helper of Laravel. It is very simple and you can use easily. you can easily generate random string in laravel 6, laravel 7, laravel 8 and laravel 9 version using str helper.
Bagaimanakah penulisan variabel pada python yang benar?
Variabel dalam python memiliki format penulisan nama_variabel = <nilai>. Variabel dapat berisi teks maupun bilangan. Terdapat beberapa aturan penulisan variabel, yaitu : nama variabel boleh diawali menggunakan huruf atau garis bawah (_) dan tidak dapat dimulai dengan angka (0-9), contoh: namasaya, _nama.
Tipe data apa saja yang ada di Python?
Apakah yang dimaksud dengan string pada bahasa pemrograman Python?
String adalah jenis yang paling populer di bahasa pemrograman. Kita bisa membuatnya hanya dengan melampirkan karakter dalam tanda kutip. Python memperlakukan tanda kutip tunggal sama dengan tanda kutip ganda.
Apa itu tipe data list?
List adalah tipe data yang paling serbaguna yang tersedia dalam bahasa Python, yang dapat ditulis sebagai daftar nilai yang dipisahkan koma (item) antara tanda kurung siku. Hal penting tentang daftar adalah item dalam list tidak boleh sama jenisnya.