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Use random_bytes if available in postfix plugin
#1833
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The [PHP `str_shuffle()`](http://php.net/manual/en/function.str-shuffle.php) documentation states: ``` This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. ``` This change makes use of [`random_bytes()`](http://php.net/manual/en/function.random-bytes.php) if it's available and falls back to the old (probably ok) `str_shuffle()` implementation.
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The PHP
str_shuffle()documentation states:This change makes use of
random_bytes()if it's available and falls back to the old (probably ok)str_shuffle()implementation.