Cara menggunakan python random string

Table of Contents

• How To Generate a Random String in PHP
• – Use str_shuffle as a Shuffling Box
• – Word Guessing Game Coding Example
• – Limitations of the str_shuffle Function
• Shuffle and Elongate the String
• – Coding Example
• PHP Generate Random Alphanumeric String
• – Coding Example
• PHP Random String With a Prefix
• – Get Started With uniqid()
• – Coding Example
• Implode() Function Helps in Creating PHP Random String
• – Coding Example
• Create a Secure PHP Random String
• – Create a Secure Random String in PHP 7
• – Generate a Secure Random String in PHP >= 5.3.0:
• How to generate random characters PHP?
• How to generate unique string in PHP?
• What is Mt_rand function in PHP?
• How do you generate random unique alphanumeric strings in laravel?
• Bagaimanakah penulisan variabel pada python yang benar?
• Tipe data apa saja yang ada di Python?
• Apakah yang dimaksud dengan string pada bahasa pemrograman Python?
• Apa itu tipe data list?

Table of Contents

• How To Generate a Random String in PHP
• – Use str_shuffle as a Shuffling Box
• – Word Guessing Game Coding Example
• – Limitations of the str_shuffle Function
• Shuffle and Elongate the String
• – Coding Example
• PHP Generate Random Alphanumeric String
• – Coding Example
• PHP Random String With a Prefix
• – Get Started With uniqid()
• – Coding Example
• Implode() Function Helps in Creating PHP Random String
• – Coding Example
• Create a Secure PHP Random String
• – Create a Secure Random String in PHP 7
• – Generate a Secure Random String in PHP >= 5.3.0:
• How to generate random characters PHP?
• How to generate unique string in PHP?
• What is Mt_rand function in PHP?
• How do you generate random unique alphanumeric strings in laravel?

Keep reading to unlock some incredible random string generators that will make your programming life easier.

Contents

• How To Generate a Random String in PHP
  • – Use str_shuffle as a Shuffling Box
  • – Word Guessing Game Coding Example
  • – Limitations of the str_shuffle Function
• Shuffle and Elongate the String
  • – Coding Example
• PHP Generate Random Alphanumeric String
  • – Coding Example
• PHP Random String With a Prefix
  • – Get Started With uniqid()
  • – Coding Example
• Implode() Function Helps in Creating PHP Random String
  • – Coding Example
• Create a Secure PHP Random String
  • – Create a Secure Random String in PHP 7
  • – Generate a Secure Random String in PHP >= 5.3.0:
• Conclusion

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:

• The str_shuffle() function
• A user-defined function that elongates the shuffled string
• An awesome user-defined function with minimum parameters
• The uniqid() function
• The implode() function
• The random_bytes() and openssl_random_pseudo_bytes functions

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:

<?php
// shuffling the words
$guess1 = str_shuffle(“computer”);
// output: upormect
$guess2 = str_shuffle(“programming”);
// output: mognragpirm
$guess3 = str_shuffle(“designing”);
// output: igeingsnd
// printing the shuffled words
echo ” $guess1 <br> $guess2 <br> $guess3″;
?>
<br>
<br>
<!– creating a form that accepts inputs with a submit button  –>
<form action=”” method=”post”>
<input type=”text” name=”answer1″><br>
<input type=”text” name=”answer2″><br>
<input type=”text” name=”answer3″><br>
<input type=”submit” value=”Submit” name=”submit”><br>
</form>
<?php
// checking if the form is submitted
if(isset($_POST[“submit”])){
$ans1 = $_POST[“answer1”];
$ans2 = $_POST[“answer2”];
$ans3 = $_POST[“answer3”];
// checking the answers provided by the user
if($ans1 == “computer” && $ans2 == “programming” && $ans3 == “designing” ){
echo “Congratulations, You Won!”;
}
else{
echo “Sorry! Your answers were incorrect.”;
}
}
?>

– 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
// defining a function
function random_string($string, $length) {
// getting the length of the passed string
$str_length = strlen($string);
// creating an empty random string
$random = “”;
// running the for loop
for($i = 0; $i < $length; $i++) {
// getting a random character from the passed string
$get_rand_character = $string[mt_rand(0, $str_length – 1)];
// adding the random character in the random string
$random .= $get_rand_character;
}
// returning the random string
return $random;
}
// executing the random_string() function
echo random_string(“development”,30);
// output: ldtllpeettmtemvepeoeelevledovn
?>

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 –>
<form action=”” method=”post”>
<input type=”number” name=”length”><br>
<input type=”submit” value=”Submit” name=”submit”><br>
</form>
<?php
// defining a function
function get_random($length) {
// defining a set of valid characters
$valid_characters =  “[email protected]#$%&*^/~,.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ”;
// creating an empty random string
$rand_string = “”;
// running the for loop
for($i = 0; $i < $length; $i++){
// getting a random character from the valid set of characters
$get_rand_character = $valid_characters[mt_rand(0, $length – 1)];
// adding the random character in the random string
$rand_string .= $get_rand_character;
}
// returning the random string
return $rand_string;
}
// checking if the form is submitted
if(isset($_POST[“submit”])){
$length = $_POST[“length”];
// using the user-defined function
echo get_random($length);
}
?>

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:

uniqid(prefix, more_entropy)

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:

<?php
// defining the expected number of random values
$count = 10;
// creating an empty array to store the random values
$ids = array();
// running the for loop
for($i=0; $i < $count ; $i++){
// using the uniqid() function to get random values
$get_unique_id = uniqid(“std_”,true);
// adding the random values in the array
$ids[] = $get_unique_id;
}
// iterating through the array and printing random values
foreach($ids as $id){
echo $id . “<br>”;
}
?>

Here is the result:

std_61e40dfa918ed9.69882712
std_61e40dfa918f51.69182240
std_61e40dfa918f83.14749621
std_61e40dfa918f99.89679871
std_61e40dfa918fb6.17935616
std_61e40dfa918fd2.28992284
std_61e40dfa918ff4.42838510
std_61e40dfa919014.37290490
std_61e40dfa919027.43801927
std_61e40dfa919051.76337443

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:

implode(separator, array)

– 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:

<?php
$array = array(“bed”, “carpet”, “table”, “chairs”, “cupboard”);
$string = implode(“”, $array);
echo str_shuffle($string);
// output: lpscubaaibarhtdrceacebtrpode
?>

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:

<?php
// using the random_bytes() function
$pseudo_bytes = random_bytes(15);
// printing the secure random string of bytes
echo $pseudo_bytes . “<br>”;
// output:  �ܡ(#Z�ڹ�
// converting bytes string into a hexadecimal string
$hex_string = bin2hex($pseudo_bytes);
// printing the secure hexadecimal string
echo $hex_string;
// output: 0a92dca12802235aee011c06dab9d9
?>

– 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:

<?php
// using the openssl_random_pseudo_bytes() function
$pseudo_bytes = openssl_random_pseudo_bytes(15, $strong);
// printing the secure random string of bytes
echo $pseudo_bytes . “<br>”;
// output: AZۘ����|S�
// converting bytes string into a hexadecimal string
$hex_string = bin2hex($pseudo_bytes);
// printing the secure hexadecimal string
echo $hex_string;
// output: 415a00db98f18cfd1188e37c53e201
?>

Conclusion

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:

• You can use the str_shuffle() function to rearrange the characters of your specified string.
• You can create and use different user-defined functions to generate a PHP random string that meets your requirements.
• The uniqid() function allows you to PHP create a random string with a prefix attached to the same.
• The implode() function can help in generating a PHP random string from the values of an array.
• The random_bytes() and openssl_random_pseudo_bytes() functions can be used to create pseudo bytes strings that are cryptographically secure.

• Author
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