What are common pitfalls when opening a file in PHP using fopen()?

Common pitfalls when opening a file in PHP using fopen() include not checking if the file exists before opening it, not handling errors properly, and not closing the file after reading or writing to it. To solve these issues, always check if the file exists using file_exists(), handle errors with appropriate error handling mechanisms like try-catch blocks, and make sure to close the file using fclose() after you are done using it. 

$filename = "example.txt";

if (file_exists($filename)) {
    $file = fopen($filename, "r");

    if ($file) {
        // Read or write operations go here

        fclose($file);
    } else {
        echo "Error opening file.";
    }
} else {
    echo "File does not exist.";
}

Keywords

fopen PHP file handling error handling permissions

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