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random_bytes()

« rand | range »
<?php
$string = random_bytes (
      // int $length
);

// shows the result in hexadecimal
if ($string) {
    $hex = bin2hex($string);
}
?>
Result
$string = 'T@<'
$hex = '547f40ef3c'
Examples
#1 random_bytes  (5)
See also
bin2hex, openssl_random_pseudo_bytes
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