How can PHP be used to check if a file already exists before creating a new one during user registration?

To check if a file already exists before creating a new one during user registration in PHP, you can use the `file_exists()` function. This function checks if a file or directory exists on the server. By using this function before creating a new file, you can prevent overwriting existing files and avoid potential data loss. 

$filename = 'user_file.txt';

if (file_exists($filename)) {
    echo 'File already exists. Please choose a different filename.';
} else {
    // Code to create a new file
    $file = fopen($filename, 'w');
    fclose($file);
    echo 'File created successfully.';
}

Keywords

PHP file_exists user registration error handling file creation

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