QFQ

h1. PHP Profiling

h2. xdebug

* https://xdebug.org/docs/profiler

* "Xdebug 3":https://www.youtube.com/playlist?list=PLg9Kjjye-m1g_eXpdaifUqLqALLqZqKd4 (youtube)

* "PHP and Docker - Xdebug":https://www.youtube.com/watch?v=sSSL8t4LBac (youtube)

h2. via php

No extensions are needed, just use these two functions for simple profiling.

<pre>

// 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>";

}

</pre>

Here is an example, calling prof_flag() with a description at each checkpoint, and prof_print() at the end:

<pre>

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();

</pre>

Output looks like this:

<pre>

Start

   0.004303

Connect to DB

   0.003518

Perform query

   0.000308

Retrieve data

   0.000009

Close DB

   0.000049

Done

</pre>