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openssl_random_pseudo_bytes()

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<?php
$string = openssl_random_pseudo_bytes (
    , // int $length
      // [bool &$crypto_strong]
);

// shows the result in hexadecimal
if ($string) {
    $hex = bin2hex($string);
}
?>
Result
$crypto_strong = true
$string = 'vz'
$hex = 'b9767afa'
Examples
#1 openssl_random_pseudo_bytes  (4,
 $crypto_strong)
#2 openssl_random_pseudo_bytes  (1,
 $crypto_strong)
#3 openssl_random_pseudo_bytes  (0,
 $crypto_strong)
#4 openssl_random_pseudo_bytes  (-1,
 $crypto_strong)
See also
bin2hex, crypt, mt_rand, random_bytes, uniqid
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