function generateRandomString($length = 25) { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $charactersLength = strlen($characters); $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, $charactersLength - 1)]; } return $randomString;
}
//usage
$myRandomString = generateRandomString(5);

function rand_str() { $characters = '0123456789-=+{}[]:;@#~.?/&gt;,&lt;|\!"£$%^&amp;*()abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $randomstr = ''; for ($i = 0; $i < random_int(50, 100); $i++) { $randomstr .= $characters[rand(0, strlen($characters) - 1)]; } return $randomstr; }

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

function random_chars($length = 12)
{ $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_?,."; $rand_chars = substr( str_shuffle( $chars ), 0, $length ); return $rand_chars;
}

phpCopy<?php
echo uniqid('user_');
?> 

phpCopy<?php
echo "Out1: ",substr(md5(time()), 0, 16),"\n";
echo "Out2: ",substr(sha1(time()), 0, 16),"\n";
echo "Out3: ",md5(time()),"\n";
echo "Out4: ",sha1(time()),"\n";
?>

/** * Generate a random string, using a cryptographically secure * pseudorandom number generator (random_int) * * This function uses type hints now (PHP 7+ only), but it was originally * written for PHP 5 as well. * * For PHP 7, random_int is a PHP core function * For PHP 5.x, depends on https://github.com/paragonie/random_compat * * @param int $length How many characters do we want? * @param string $keyspace A string of all possible characters * to select from * @return string */
function random_str( int $length = 64, string $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
): string { if ($length < 1) { throw new \RangeException("Length must be a positive integer"); } $pieces = []; $max = mb_strlen($keyspace, '8bit') - 1; for ($i = 0; $i < $length; ++$i) { $pieces []= $keyspace[random_int(0, $max)]; } return implode('', $pieces);
}

phpCopy<?php $x = 0; $y = 10;
$Strings = '0123456789abcdefghijklmnopqrstuvwxyz';
echo "Gen_rand_str: ",substr(str_shuffle($Strings), $x, $y), "\n";
$a = 0;
$b = 20;
$Strings='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
echo "Gen_My_Pass: ",'hello.'.substr(str_shuffle($Strings), $a, $b).'.World',"\n";
?>

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