Add EXPLAIN to QueryCollector

src/DataCollector/QueryCollector.php

@@ -14,6 +14,8 @@ class QueryCollector extends PDOCollector
     protected $queries = array();
     protected $renderSqlWithParams = false;
     protected $findSource = false;
+    protected $explainQuery = false;
+    protected $explainTypes = array('SELECT'); // array('SELECT', 'INSERT', 'UPDATE', 'DELETE'); for MySQL 5.6.3+
 
     /**
      * @param TimeDataCollector $timeCollector
@@ -53,12 +55,21 @@ public function setFindSource($value = true)
      */
     public function addQuery($query, $bindings, $time, $connection)
     {
+        $explainResults = array();
         $time = $time / 1000;
         $endTime = microtime(true);
         $startTime = $endTime - $time;
 
         $pdo = $connection->getPdo();
         $bindings = $connection->prepareBindings($bindings);
+
+        // Run EXPLAIN on this query (if needed)
+        if ($this->explainQuery && preg_match('/^('.implode($this->explainTypes).') /i', $query)) {
+            $statement = $pdo->prepare('EXPLAIN ' . $query);
+            $statement->execute($bindings);
+            $explainResults = $statement->fetchAll(\PDO::FETCH_ASSOC);
+        }
+
         $bindings = $this->checkBindings($bindings);
         if (!empty($bindings) && $this->renderSqlWithParams) {
             foreach ($bindings as $binding) {
@@ -81,6 +92,16 @@ public function addQuery($query, $bindings, $time, $connection)
             'source' => $source,
         );
 
+        //Add the results from the explain as new rows
+        foreach($explainResults as $result){
+            $this->queries[] = array(
+                'query' => 'EXPLAIN ' . $query,
+                'bindings' => $result,
+                'time' => $time,
+                'source' => $source,
+            );
+        }
+
         if ($this->timeCollector !== null) {
             $this->timeCollector->addMeasure($query, $startTime, $endTime);
         }