PHP extension development: How to improve the efficiency of custom functions through performance analysis tools?

Use performance analysis tools such as Xdebug and Blackfire to effectively identify and solve performance problems in PHP custom functions: analyze function calls, identify redundant calls and delete them. Optimize variable access within loops and use local variables to store calculated values ​​to reduce unnecessary access.

PHP extension development: Performance analysis tools help speed up custom functions

Introduction

PHP extensions can enhance the functionality of PHP by adding custom functions, but these functions may adversely affect performance. This article introduces how to use performance analysis tools to identify and solve performance bottlenecks in custom functions to ensure the efficiency of expansion.

Practical case

Suppose we have a custom function my_strlen(), used to calculate the length of a string. The following is a code example:

<?php

function my_strlen($string)
{
    $length = 0;
    for ($i = 0; $i < strlen($string); $i++) {
        $length++;
    }
    return $length;
}

Performance Analysis

We can use the following tools to analyze the performance of my_strlen():

• Xdebug: PHP debugging extension, providing function call tracing and performance analysis.
• Blackfire: Professional tool for PHP performance analysis, providing detailed performance reports.

After analyzing my_strlen() under Xdebug, we found that the function calls the strlen() function, which is redundant for string length calculation. . After removing this call, performance improved significantly.

Using Blackfire analysis my_strlen(), we found that the function accesses the length of the string multiple times within the loop. The optimized code stores the string length in a local variable to reduce unnecessary accesses:

<?php

function my_strlen($string)
{
    $length = strlen($string);
    for ($i = 0; $i < $length; $i++) {
        // ...
    }
    return $length;
}

Conclusion

By using performance analysis tools, we can Identify and resolve performance bottlenecks in PHP custom functions to improve the overall efficiency of the extension.

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