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wp-content/plugins/query-monitor/output/Headers.php

@@ -0,0 +1,32 @@
+<?php declare(strict_types = 1);
+/**
+ * Abstract output class for HTTP headers.
+ *
+ * @package query-monitor
+ */
+
+abstract class QM_Output_Headers extends QM_Output {
+
+	/**
+	 * @return void
+	 */
+	public function output() {
+
+		$id = $this->collector->id;
+
+		foreach ( $this->get_output() as $key => $value ) {
+			if ( ! is_scalar( $value ) ) {
+				$value = json_encode( $value );
+			}
+
+			# Remove illegal characters (Header may not contain NUL bytes)
+			if ( is_string( $value ) ) {
+				$value = str_replace( chr( 0 ), '', $value );
+			}
+
+			header( sprintf( 'X-QM-%s-%s: %s', $id, $key, $value ) );
+		}
+
+	}
+
+}