Update README.md

README.md

@@ -20,4 +20,32 @@ xhprof.output_dir = /tmp/xhprof
 ```
 
 #新增
-####pdo预处理
+####pdo占位符转换
+pdo预处理占位符将会转换成实际的参数，更好的掌握mysql执行消耗(只用做xhprof记录，不改变程序执行过程)
+```php
+$_sth = $db->prepare("SELECT * FROM user where userid = :id and username = :name");
+$_sth->execute([':id' => '1', ':name' => 'admin']);
+$data1 = $_sth->fetch();
+
+$_sth = $db->prepare("SELECT * FROM user where userid = ?");
+$_sth->execute([1]);
+$data2 = $_sth->fetch();
+```
+#####xhprof记录数据
+```
+PDOStatement::execute#SELECT * FROM user where userid = 1 and username = admin
+
+PDOStatement::execute#SELECT * FROM user where userid = 1
+```
+
+####curl地址记录
+```php
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_URL, "http://www.baidu.com");
+$output = curl_exec($ch);
+curl_close($ch);
+```
+#####xhprof记录数据
+```
+curl#http://www.baidu.com
+```