PHP function introduction—chdir(): change the current working directory

PHP function introduction—chdir(): Change the current working directory

In PHP, the chdir() function is a function used to change the current working directory. Its function is to change the current directory when the program is running, so that the next operations of the program are performed in the specified directory. The chdir() function can be easily used in application scenarios such as file operations and batch processing.

Syntax:
bool chdir (string $directory)

Parameters:

• directory: Required. The directory path to switch to.

Return value:
If the switch is successful, return true; if the switch fails, return false.

Example:

<?php
// 当前工作目录为 /var/www/html/

// 打印当前工作目录
echo "当前工作目录为: " . getcwd() . "<br>";

// 切换到 /var/www/html/uploads/
if (chdir("/var/www/html/uploads/")) {
    echo "切换成功！" . "<br>";
} else {
    echo "切换失败！" . "<br>";
}

// 打印切换后的当前工作目录
echo "当前工作目录为: " . getcwd() . "<br>";
?>

Output result:

当前工作目录为: /var/www/html/
切换成功！
当前工作目录为: /var/www/html/uploads/

In the above example, the getcwd() function is first used to print out the current working directory. Then use the chdir() function to switch the working directory to the specified directory "/var/www/html/uploads/". After the switch is successful, use the getcwd() function again to print out the current working directory. You can see that the switch has been successful.

The chdir() function is very useful for file operations. For example, when you need to read and write files in different directories, you can use the chdir() function to switch to the corresponding directory to facilitate file manipulation.

Note:

1. When using the chdir() function to switch directories, ensure the accessibility of the target directory. If the directory does not exist or does not have access rights, the switch operation will fail.
2. The chdir() function only changes the temporary state of the current working directory and does not change the running directory of the script.

Summary:
The chdir() function is a function in PHP used to change the current working directory. It can easily switch the running directory of the program. In application scenarios such as file operations and batch processing, the chdir() function can provide convenient operation methods. It should be noted that when switching directories, the accessibility of the target directory must be ensured, and the chdir() function only changes the temporary state of the current working directory and does not change the running directory of the script.

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