分析PHP脚本执行时间的最简单方法

不需要扩展，只需使用这两个函数进行简单的分析。

// Call this at each point of interest, passing a descriptive string
function prof_flag($str)
{
    global $prof_timing, $prof_names;
    $prof_timing[] = microtime(true);
    $prof_names[] = $str;
}

// Call this when you're done and want to see the results
function prof_print()
{
    global $prof_timing, $prof_names;
    $size = count($prof_timing);
    for($i=0;$i<$size - 1; $i++)
    {
        echo "<b>{$prof_names[$i]}</b><br>";
        echo sprintf("&nbsp;&nbsp;&nbsp;%f<br>", $prof_timing[$i+1]-$prof_timing[$i]);
    }
    echo "<b>{$prof_names[$size-1]}</b><br>";
}

下面是一个示例，调用prof_flag（），每个检查点都有一个描述，最后是prof_print（）：

prof_flag("Start");

   include '../lib/database.php';
   include '../lib/helper_func.php';

prof_flag("Connect to DB");

   connect_to_db();

prof_flag("Perform query");

   // Get all the data

   $select_query = "SELECT * FROM data_table";
   $result = mysql_query($select_query);

prof_flag("Retrieve data");

   $rows = array();
   $found_data=false;
   while($r = mysql_fetch_assoc($result))
   {
       $found_data=true;
       $rows[] = $r;
   }

prof_flag("Close DB");

   mysql_close();   //close database connection

prof_flag("Done");
prof_print();

输出看起来像这样：

开始
   0.004303 
连接到DB
   0.003518 
执行查询
   0.000308 
检索数据
   0.000009 
关闭DB
   0.000049 
完成