What are the best practices for handling file operations in PHP to avoid common errors like "failed to open stream" or "not a valid stream resource" warnings?

When handling file operations in PHP, it's important to check if the file exists before trying to open it, handle errors gracefully, and close the file after operations are completed. To avoid common errors like "failed to open stream" or "not a valid stream resource" warnings, always use proper error handling techniques, such as checking if the file exists, using try-catch blocks, and closing the file resource properly. 

// Check if the file exists before trying to open it
$file = 'example.txt';
if (file_exists($file)) {
    try {
        $handle = fopen($file, 'r');
        // Perform file operations here
        fclose($handle);
    } catch (Exception $e) {
        echo 'Error: ' . $e->getMessage();
    }
} else {
    echo 'File does not exist.';
}

Keywords

file operations PHP error handling open stream stream resource

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