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PHP is a widely used server-side programming language. It has a wide range of applications and has very powerful functions in network programming, database operations, file processing, etc. PHP has many built-in functions that can be called directly to complete various tasks. Among them, functions related to Linux systems play a very important role. In this article, we will detail the Linux system functions of PHP functions.
1. File-related functions
$file = fopen("file.txt","r");
fclose($file);
fwrite($file,"Hello World!");
if(file_exists("file.txt")){
echo "文件存在";
}else{
echo "文件不存在";
}
$content = file_get_contents("file.txt");
2. Process-related functions
exec("ls -al");
system("ls -al");
passthru("ls -al");
$descriptorspec = array(
0 => array("pipe", "r"), // Standard input
1 => array("pipe" , "w"), // Standard output
2 => array("file", "/tmp/error-output.txt", "a") // Standard error output
);
$process = proc_open('php script.php', $descriptorspec, $pipes);
proc_close($process);
3. Network related functions
$fp = fsockopen("www.example.com", 80);
fwrite($fp, "GET / HTTP/1.0
Host: www.example.com
");
while(!feof($fp)) {
echo fgets($fp, 1024);
}
fclose($fp);
4. Other functions
$output = shell_exec('ls -al');
$status = system_status();
$uid = posix_getuid();
Conclusion:
Linux operating system is a very important server operating system. PHP, as a server-side programming language, is closely related to Linux. This article introduces the Linux system functions of PHP functions, which are mainly divided into file-related functions, process-related functions, network-related functions and other functions. These functions are very useful and help us easily access various features of the Linux operating system in PHP programs and improve the development efficiency and functionality of the program.
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