(PHP 7)
random_bytes — Generates cryptographically secure pseudo-random bytes
$length
)Generates an arbitrary length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors.
The sources of randomness used for this function are as follows:
Note: Although this function was added to PHP in PHP 7.0, a » userland implementation is available for PHP 5.2 to 5.6, inclusive.
length
The length of the random string that should be returned in bytes.
Returns a string containing the requested number of cryptographically secure random bytes.
length
of bytes is given, an
Error will be thrown.
Example #1 random_bytes() example
<?php
$bytes = random_bytes(5);
var_dump(bin2hex($bytes));
?>
以上例程的输出类似于:
string(10) "385e33f741"