What best practices should be followed when checking for the existence of files in PHP to avoid errors and improve performance?

When checking for the existence of files in PHP, it is important to use the `file_exists()` function rather than relying on file paths directly. This function returns a boolean value indicating whether a file exists or not, which helps avoid errors caused by incorrect paths or permissions. Additionally, using `file_exists()` can improve performance by directly checking the file system instead of attempting to access files that may not exist. 

$file_path = "/path/to/file.txt";

if (file_exists($file_path)) {
    echo "File exists!";
} else {
    echo "File does not exist.";
}

Keywords

file_exists is_file error handling performance optimization directory traversal

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