Added PHP version and OPcache status information.

src/Record/Collector/Core_Load_Collector.php

@@ -30,12 +30,19 @@ class Core_Load_Collector implements Record_Collector_Interface {
 
 		$request_time = filter_var( $_SERVER['REQUEST_TIME_FLOAT'], FILTER_VALIDATE_FLOAT );
 
+		$php = 'PHP Load – ' . PHP_VERSION;
+
+		if ( function_exists( 'opcache_get_status' ) ) {
+			$zend_status = opcache_get_status();
+			$php         .= empty( $zend_status['opcache_enabled'] ) ? '' : ' – OPcache';
+		}
+
 		/**
 		 * @var float $request_time
 		 * @var float $timestart
 		 */
 		return [
-			new Record( 'PHP Load', $request_time, $timestart - $request_time, '', 'php' ),
+			new Record( $php, $request_time, $timestart - $request_time, '', 'php' ),
 			// TODO This includes network plugins on multisite, need conditional label if Laps is network–activated.
 			new Record( 'Core and MU Plugins Load', $timestart, $this->timeload - $timestart, '', 'core' ),
 		];