random_bytes() to generates cryptographically secure pseudo-random bytes

random_bytes to generate cryptographically secure random bytes

echo random_bytes($length);

$length : Length of the random string returned as bytes.

Generates cryptographically secure pseudo-random bytes which can be used as Salts, keys etc.

Available in PHP 7

Example

$str=random_bytes(7);
echo bin2hex($str);

Output ( Refresh this page to to see how the random number changes )

4e3eaa91b4ffc2

Example 1: Generating Cryptographically Secure API Keys

<?php
$key = bin2hex(random_bytes(16));  // Generates a 32-character API key
echo "Generated API key: $key";
?>

Example 2: Creating Random Passwords

<?php
$password = bin2hex(random_bytes(8));  // Generates a secure 16-character password
echo "Random password: $password";
?>

Example 3: Generating Salt for Hashing

<?php
$salt = bin2hex(random_bytes(16));  // 16-byte salt for hashing
echo "Generated salt: $salt";
?>

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