How to use PHP for system detection

PHP is a scripting language widely used in website development. It can provide developers with rich system detection functions. System detection refers to judging the performance and stability of the system by analyzing the resource usage, hardware information and software environment of the operating system. This article will introduce how to use PHP for system detection, providing developers with detailed information about servers, memory, CPU, network and storage.

1. Get PHP information

First, we can use the following code to get PHP configuration information:

phpinfo( );
?>

This code will return detailed information about the PHP running environment, including PHP version, compiler type, configuration options and modules, etc.

2. Operating system information

To obtain operating system information, you can use the PHP function "php_uname()". This function returns a string. On the Windows operating system, returns the system The version information is as follows:

echo php_uname() . "
";
?>

On Linux or Unix systems , returns information such as system hardware architecture, host name and kernel version, as shown below:

echo php_uname('m') . "
";
echo php_uname( 'n') . "
";
echo php_uname('r') . "
";
?>

In addition, you can use the "get_loaded_extensions()" function To get the installed extensions of the system, as follows:

$extensions = get_loaded_extensions();
foreach ($extensions as $extension) {

echo "$extension

";
}
?>

3. Disk space

To obtain disk space information, you can use the PHP functions "disk_free_space()" and "disk_total_space() ", used to obtain available disk space and total disk space respectively, as follows:

$free_space = disk_free_space('/');
$total_space = disk_total_space(' /');

echo "Total space: " . format_size($total_space) . "
";
echo "Free space: " . format_size($free_space) . "
" ;

function format_size($bytes) {

$units = array('B', 'KB', 'MB', 'GB', 'TB');

$i = 0;
while ($bytes >= 1024 && $i < count($units) - 1) {
    $bytes /= 1024;
    $i++;
}

return round($bytes, 2) . ' ' . $units[$i];

}
?>

4. Memory usage

Get For memory usage, you can use the PHP functions "memory_get_usage()" and "memory_get_peak_usage()" to obtain the memory used by the current script and the peak memory used by the PHP process, respectively, as shown below:

$current_usage = memory_get_usage();
$peak_usage = memory_get_peak_usage();

echo "Current usage: " . format_size($current_usage) . "
";
echo " Peak usage: " . format_size($peak_usage) . "
";
?>

You can use this code snippet to calculate the memory used by the script.

5. CPU usage

To obtain the CPU usage, you can use the PHP function "getrusage()", which returns an associative array containing detailed information about the CPU time, as follows Display:

$usage = getrusage();

echo "User time: " . format_time($usage['ru_utime.tv_sec'] ($usage[ 'ru_utime.tv_usec'] / 1000000)) . "
";
echo "System time: " . format_time($usage['ru_stime.tv_sec'] ($usage['ru_stime.tv_usec'] / 1000000 )) . "
";

function format_time($seconds) {

$hours = floor($seconds / 3600);
$minutes = floor(($seconds / 60) % 60);
$seconds = floor($seconds % 60);

return sprintf('%02d:%02d:%02d', $hours, $minutes, $seconds);

}
?>

6. Network transmission rate

To obtain the network transmission rate, you can use the PHP extensions "pcntl_fork()" and "pcntl_waitpid()". Here we write a simple function to obtain the website access speed:

function get_download_speed($url) {

$start_time = microtime(true);

$file = file_get_contents($url);

$end_time = microtime(true);
$speed = (strlen($file) / ($end_time - $start_time)) / 1024 / 1024;

return round($speed, 2) . ' MB/s';

}

echo get_download_speed('https://www.baidu.com/');
?>

7. Summary

The above is a method of using PHP for system detection. This method can be used to monitor the performance and resource usage of the server. Use these functions to analyze server load, identify bottlenecks and performance issues, and optimize the system through methods such as hardware upgrades and software reconstruction.

In general, developers can choose different tools and technologies for system testing as needed to help them better understand the usage of system resources so that they can optimize and improve the system.

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