From PHP7 to PHP8: Practical tips for the php_strip_whitespace() function

PHP is currently one of the most popular web programming languages. Since the launch of PHP 7, its performance and security have been greatly improved. The latest PHP 8 has added many new features and improvements, one of which deserves attention is the update of the php_strip_whitespace() function. In this article, I'll cover practical tips for this function and how to make the most of its new features in PHP 8.

1. Basic introduction to the php_strip_whitespace() function

The php_strip_whitespace() function is a built-in function in PHP. Its function is to remove excess spaces and comments in the PHP file to ensure that the PHP file of minimization. After processing, the file size will be significantly reduced, which can also reduce the occupation of server resources and the burden of network transmission, and improve the access speed and performance of the website.

2. Usage scenarios of php_strip_whitespace() function

php_strip_whitespace() function is mainly used in the following scenarios:

1. Accelerate Web applications

When As your website's traffic expands, so does your PHP file size. However, larger files take longer to transfer and use more server resources, which can result in slower website performance. Using the php_strip_whitespace() function can effectively reduce file size, reduce network transmission and server resource consumption, and accelerate web applications.

2. Obfuscated PHP files

Comments and spaces in PHP files can easily allow malicious users to see the source code, giving them the opportunity to attack the website. Use the php_strip_whitespace() function to remove comments and spaces, making the source code difficult to understand and crack, and improving website security.

3. Optimize code

Some non-standard PHP code will cause errors during runtime, causing the program to crash. Use the php_strip_whitespace() function to eliminate abnormal characters and spaces in the code, standardize the code format, and improve code quality and performance.

3. Update of php_strip_whitespace() function in PHP 8

PHP 8 has updated the php_strip_whitespace() function and introduced new practical functions to better meet the needs of web program developers. need.

1. Support multiple file processing

In versions prior to PHP 8, the php_strip_whitespace() function can only process one PHP file. PHP 8 supports multi-file processing and can process multiple files at the same time. These files can be all files in a directory or files dynamically generated in a web application.

2. Support more file formats

PHP 8 introduces a new parameter form that can expand the file formats supported by the php_strip_whitespace() function. Users can freely extend the functions of the function through their own defined rules to better handle different types of files.

3. Faster processing speed

PHP 8 optimizes the performance of the php_strip_whitespace() function to process PHP files faster.

4. Practical tips for the php_strip_whitespace() function

1. Reduce the PHP file to the minimum

Use the php_strip_whitespace() function to reduce the PHP file to the minimum. The following code demonstrates how to use the php_strip_whitespace() function to compress a PHP file to a minimum:

<?php 
$file = 'example.php'; 
$source = file_get_contents($file); 
$compressed = php_strip_whitespace($source); 
file_put_contents('compressed_file.php', $compressed); 
?>

This code removes all spaces and comments from the example.php file and saves the compressed code in compressed_file.php in the file.

2. Obfuscate PHP files

Using the php_strip_whitespace() function can make PHP files more difficult to crack and attack. Here are some practical tips:

• When using variable names in PHP files, do not use meaningful words, but use casual names. This makes the variables difficult to guess, making it more difficult to crack.
• Don’t use semantic function names in PHP files, instead use arbitrary names. This can make the source code difficult to understand and refactor.
• Delete all comments in PHP files. Comments not only expose the logic and design ideas of the code, but may also contain sensitive information, making it easier for attackers to crack the code.

3. Batch processing of files

In PHP 8, you can use the php_strip_whitespace() function to process multiple files. The following code demonstrates how to process all PHP files in a directory:

<?php 
$dir = '/var/www/html'; 
$filelist = glob($dir . '/*.php'); //获取所有PHP文件 
foreach ($filelist as $file) { 
   $source = file_get_contents($file); 
   $compressed = php_strip_whitespace($source); //压缩PHP文件 
   file_put_contents($file, $compressed); //覆盖原有文件 
} 
?>

This code compresses all PHP files in the directory /var/www/html and overwrites the original files.

5. Summary

The php_strip_whitespace() function is a powerful and practical function in PHP, which can effectively optimize PHP code and improve the performance and security of Web applications. In PHP 8, the php_strip_whitespace() function has been further upgraded, providing more functions and higher processing speed, making it more practical. I hope this article can help PHP program developers so that they can better utilize the php_strip_whitespace() function to optimize their web applications.

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