openssl_random_pseudo_bytes

(PHP 5 >= 5.3.0)

openssl_random_pseudo_bytes — Generate a pseudo-random string

説明

bool openssl_random_pseudo_bytes ( string $length , string $strong )

openssl_random_pseudo_bytes() returns a string with length caracters. It also indicates if it has used a strong algorithm to produce those pseudo-random bytes in the second argument.

パラメータ

length: The length of the desired string. Must be a positive integer. PHP will try to cast this parameter to a non-null integer to use it.
strong: If a strong algorithm was used, or not, as a boolean. This parameter will be NULL if an error occurrs.

返り値

Returns the generated string in cas of success, or FALSE in case of error.

例

例1 openssl_random_pseudo_bytes() example


<?php
for ($i = -1; $i < 5; $i++) {
    var_dump(bin2hex(openssl_random_pseudo_bytes($i, $strong)));
    var_dump($strong);
}

?>

上の例の出力は、たとえば以下のようになります。

string(0) ""
NULL
string(0) ""
NULL
string(2) "f6"
bool(true)
string(4) "8999"
bool(true)
string(6) "c202c9"
bool(true)
string(8) "45261b8f"
bool(true)