WPDB: Check that `AUTH_SALT` is not empty, Fix a PHP notice when `AUTH_SALT` is undefined.
Props jsonfry, mkomar, pento. Merges [42119] and [42120] to the 4.8 branch. Fixes #42431 and #42401 for 4.8. Built from https://develop.svn.wordpress.org/branches/4.8@42230 git-svn-id: http://core.svn.wordpress.org/branches/4.8@42059 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -1964,7 +1964,7 @@ class wpdb {
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// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
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$algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
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// Old WP installs may not have AUTH_SALT defined.
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$salt = defined( 'AUTH_SALT' ) ? AUTH_SALT : rand();
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$salt = defined( 'AUTH_SALT' ) && AUTH_SALT ? AUTH_SALT : (string) rand();
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$placeholder = '{' . hash_hmac( $algo, uniqid( $salt, true ), $salt ) . '}';
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}
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