What potential issues can arise when reading and writing data to text files in PHP?

One potential issue when reading and writing data to text files in PHP is file permissions. If the file does not have the correct permissions set, PHP may not be able to read or write to the file. To solve this issue, you can ensure that the file has the correct permissions set before attempting to read or write to it. 

// Check file permissions before reading or writing
$filename = "data.txt";

if (is_readable($filename) && is_writable($filename)) {
    // File has correct permissions, proceed with reading or writing
    $data = file_get_contents($filename);
    // Do something with the data
} else {
    echo "File permissions are not set correctly.";
}

Keywords

file handling fopen fwrite fclose error handling

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