Use the Ltrace tool to track PHP library function call methods, Ltrace library functions _php Tutorial

Use the Ltrace tool to track PHP library function call methods, Ltrace library functions

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

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

Like I have this PHP code.

test.php:

<?php $y = ' 1380 '; $arr = Array (); for ($i = 0; $i <, $i + +) {   $arr [] = "{$i}";//intentionally enclose it in quotation marks as a string} for ($i = 0; $i <; $i + +) {   if (!in_arra Y ($y, $arr)) continue; }?>

Ltrace-c/usr/local/php/bin/php test.php (-c = Rollup)

You will see the following output:

% time   seconds Usecs/call   calls   function--------------------------------------------------------- 95.02  7.417240     368   20146 strtol2.15  7.160390     413   17316 memcpy1.63  5.522641     240   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 strlen

You can see that the strtol almost used 95.02% of the execution time, the bottleneck is found out. and PHP will attempt to convert string line numbers to long when In_array () is tested, which can be time consuming. So as long as the string is converted to shaping can greatly improve efficiency.

Ltrace is really a good tool.

I hope this article is helpful to you in PHP programming.

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