Gary Pendergast f7fbbcba0d WPDB: Fix a PHP notice when AUTH_SALT is undefined.
In `wpdb::placeholder_escape()`, the key for `hash_hmac()` falls back to `rand()` when `AUTH_SALT` is undefined. `hash_hmac()` requires the key to be a string, however, so we need to cast it as such.

Props mkomar.
Fixes #42401.



git-svn-id: https://develop.svn.wordpress.org/trunk@42119 602fd350-edb4-49c9-b593-d223f7449a82
2017-11-07 00:29:26 +00:00
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