wp_mail() is PHPMailer configured to use PHP’s mail(), which hands the message to whatever MTA is on the box. The message therefore leaves from the web server, as…
Three installs, three plugin sets, one person patching them — a security release forgotten on the third site for six weeks. The import order, and what a shared…
json_encode() is all-or-nothing. One byte of invalid UTF-8 anywhere in the structure and the return value is false — not a partial document, not the offending field omitted,…
ALTER TABLE on 30 million rows blocks writes for 40 minutes, and checkout writes to that table. A shadow table, triggers, and a backfill paced by replication lag.
The error suppression operator looks like a targeted silence — this one call, this one expected warning. It is neither targeted nor free. PHP implements it by saving…