PHP Generating Random Strings And Numbers

How to create a random string of PHP. The code below for creating a unique ID number function.

PHP Function That Generating Random Strings

This PHP random_strings() function creates a combination of uppercase and lowercase letters, including underscore.

PHP
<?php
function random_strings($length = 10) {
    $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_';
    $chars_length = strlen($chars);
    $string = '';
    for ($i = 0; $i < $length; $i++) {
        $string .= $chars[rand(0, $chars_length - 1)];
    }
    return $string;
}

//usage. set strings length 
echo random_strings(15); //output d8iSfUi8484_rij

echo random_strings(5); //output j6yh2d

?>

PHP Random Number Function

This PHP random_numbers() function generates mixed numbers.

PHP
<?php
function random_numbers($length = 10) {
    $numbers = '0123456789';
    $numbers_length = strlen($numbers);
    $number = '';
    for ($i = 0; $i < $length; $i++) {
        $number .= $numbers[rand(0, $numbers_length - 1)];
    }
    return $number;
}

//usage
echo random_numbers(15); //659854320686554

echo random_numbers(5); //12685
?>

Using PHP Get A Random Number Within Range

The rand() function generates a random integer. Example If you want a random integer between 1 and 10, use rand(1,10)

PHP
<?php
  $min = 1;
  $max = 10;
  echo rand($min, $max); // 7
?>

Generate random mixed string numbers and special characters with PHP

This PHP function generates random passwords or a mixed string of numbers and special characters.

PHP
<?php 
function random_mixed($length = 8) {
    $result = "";
    $chars = "1234567890";
    $chars .= "abcdefghijklmnopqrstuvwxyz";
    $chars .= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $chars .= "~!@#$%^&*()_+}{></[]|-,:;'\".?";
    $chars_length = strlen($chars);
    for ($i = 0; $i < $length; $i++) {
        $result .= $chars[rand(0, $chars_length - 1)];
    }
    return $result;
}


// usage
echo random_mixed(10);  // 4P0p*ByK!"
 ?>
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