Why WordPress Developers Should Use $wpdb->prepare() Instead of String Concatenation
WordPress plugins and themes that query the database through the global $wpdb object should never insert user input directly into SQL strings. Doing so opens the door to SQL injection, where crafted input can alter a query's logic and expose more data than intended. The recommended safeguard is $wpdb->prepare(), which uses typed placeholders to escape values before they are inserted into the statement. Choosing the right placeholder, such as %s for strings, %d for integers, or %f for floats, also ensures values are treated as the expected type. The article further notes that LIKE clauses need extra care, since wildcard characters in search terms can still change query behavior.
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