generate random string in php

1/**
2 * Generate a random string, using a cryptographically secure 
3 * pseudorandom number generator (random_int)
4 *
5 * This function uses type hints now (PHP 7+ only), but it was originally
6 * written for PHP 5 as well.
7 * 
8 * For PHP 7, random_int is a PHP core function
9 * For PHP 5.x, depends on https://github.com/paragonie/random_compat
10 * 
11 * @param int $length      How many characters do we want?
12 * @param string $keyspace A string of all possible characters
13 *                         to select from
14 * @return string
15 */
16function random_str(
17    int $length = 64,
18    string $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
19): string {
20    if ($length < 1) {
21        throw new \RangeException("Length must be a positive integer");
22    }
23    $pieces = [];
24    $max = mb_strlen($keyspace, '8bit') - 1;
25    for ($i = 0; $i < $length; ++$i) {
26        $pieces []= $keyspace[random_int(0, $max)];
27    }
28    return implode('', $pieces);
29}
30

1phpCopy<?php 
2$Random_str = uniqid();  
3echo "Random String:", $Random_str, "\n";
4?> 
5

1phpCopy<?php
2 
3echo "Out1: ",substr(md5(time()), 0, 16),"\n";
4 
5echo "Out2: ",substr(sha1(time()), 0, 16),"\n";
6 
7echo "Out3: ",md5(time()),"\n";
8 
9echo "Out4: ",sha1(time()),"\n";
10 
11?>
12

1phpCopy<?php
2 $x = 0;
3 $y = 10;
4$Strings = '0123456789abcdefghijklmnopqrstuvwxyz';
5echo "Gen_rand_str: ",substr(str_shuffle($Strings), $x, $y), "\n";
6
7$a = 0;
8$b = 20;
9$Strings='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
10echo "Gen_My_Pass: ",'hello.'.substr(str_shuffle($Strings), $a, $b).'.World',"\n";
11?>
12

1phpCopy<?php
2 
3function secure_random_string($length) {
4    $rand_string = '';
5    for($i = 0; $i < $length; $i++) {
6        $number = random_int(0, 36);
7        $character = base_convert($number, 10, 36);
8        $rand_string .= $character;
9    }
10 
11    return $rand_string;
12}
13 
14echo "Sec_Out_1: ",secure_random_string(10),"\n";
15 
16echo  "Sec_Out_2: ",secure_random_string(10),"\n";
17 
18echo  "Sec_Out_3: ",secure_random_string(10),"\n";
19 
20?>
21

1phpCopy<?php 
2echo uniqid('user_');
3?> 
4

1phpCopy<?php
2 
3echo "Output-1: ",bin2hex(random_bytes(10)),"\n";
4 
5echo "Output-2: ",bin2hex(random_bytes(20)),"\n";
6 
7echo "Output-3: ",bin2hex(random_bytes(24)),"\n";
8 
9?>
10

1phpCopy<?php
2function random_str_generator ($len_of_gen_str){
3    $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
4    $var_size = strlen($chars);
5    echo "Random string ="; 
6    for( $x = 0; $x < $len_of_gen_str; $x++ ) {  
7        $random_str= $chars[ rand( 0, $var_size - 1 ) ];  
8        echo $random_str;  
9    }
10echo "\n";
11}
12random_str_generator (8)
13?>
14