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How can PHP developers ensure data integrity and user privacy when working with file access permissions on a web server?

PHP developers can ensure data integrity and user privacy when working with file access permissions on a web server by setting strict permissions on files and directories, ensuring that sensitive data is not accessible to unauthorized users. This can be achieved by using the chmod() function to set specific permission levels for files and directories, such as restricting access to read, write, and execute permissions for certain users or groups.

php 
// Set strict file permissions
$file = 'sensitive_data.txt';
$permissions = 0600; // Only owner can read and write
chmod($file, $permissions);

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