Description:
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---
From manual page: http://www.php.net/function.base64-encode
---
base64_encode now only takes one str argument, that will make conversion of a byte stream with \0 in it fail, so can't convert arbitrary byte stream properly.

Test script:
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$randv=shell_exec("dd if=/dev/urandom bs=1 count=6 2>/dev/null");
$salt="\$1\$".base64_encode($randv);

Expected result:
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$salt="\$1\$".base64_encode($randv, 6);

Actual result:
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depends on what we get from the /dev/urandom, the $salt could be shorter than 8 characters as it supposed to be.