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wp_salt

Get salt to add to hashes to help prevent attacks.The secret key is located in two places: the database in case the secret key isn’t defined in the second place, which is in the wp-config.php file. If you are going to set the secret key, then you must do so in the wp-config.php file.

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wp_safe_redirect

Performs a safe (local) redirect, using wp_redirect().Checks whether the $location is using an allowed host, if it has an absolute path. A plugin can therefore set or remove allowed host(s) to or from the list.

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