What are common issues when writing variables to a file in PHP?

One common issue when writing variables to a file in PHP is not properly handling file permissions. Make sure the file you are trying to write to has the correct permissions set to allow writing. Another issue could be not properly escaping or formatting the data before writing it to the file, which can result in corrupted data. Lastly, ensure that you are opening the file in the correct mode (e.g., 'w' for writing, 'a' for appending). 

// Fixing file permissions issue
$filename = 'data.txt';
if (is_writable($filename)) {
    $file = fopen($filename, 'w');
    fwrite($file, $yourVariable);
    fclose($file);
} else {
    echo "Cannot write to file. Check file permissions.";
}

Keywords

file writing variables PHP errors permissions

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