Using the Ltrace tool to track the methods of PHP library function calls _php tips

The example in this article describes the method used to track PHP library function calls using the Ltrace tool. Share to everyone for your reference, specific as follows:

Maybe everyone is already familiar with using Strace to track system calls, today we introduce a tool for tracking library functions Ltrace

Like I have such a section of PHP code

test.php:

<?php
 $y = ' 1380 ';
 $arr = Array ();
 for ($i = 0; $i < $i + +) {
   $arr [] = ' {$i} ';///intentionally wrapped in quotation marks set to string
 } for
 ($i = 0; $i <; $i + +) {
   if ( !in_array ($y, $arr)) Continue
 }
? >

Ltrace-c/usr/local/php/bin/php test.php (-C for summary)

You will see the output as follows:

% time   seconds Usecs/call   calls   function
------------------------------------------------------- --
95.02  7.417240     368   20146 strtol 2.15
7.160390 413 17316 memcpy 1.63  5.522641   22966 free
 0.67  2.275374   2275374     1 curl_global_cleanup
 0.54  2.235466     617   3618 __ctype_tolower_loc
 0.16   2.123547 1194 1778 STRRCHR
 0.17  1.532224   22836 malloc
 0.29   0.382083-5678

You can see that strtol almost used the execution time of 95.02%, the bottleneck was found out. and PHP tries to convert the string line number to long when the In_array () test, which can take a lot of time. So as long as the string is converted to the shaping can greatly improve efficiency.

Ltrace really is a good tool.

I hope this article will help you with the PHP program design.