What common mistake is made in the PHP code provided that results in the file "htmlSave.dat" remaining empty?

The common mistake in the provided PHP code is that the file "htmlSave.dat" is opened in write mode 'w' without checking if the file was successfully opened. If there is an issue opening the file, it will result in an empty file. To solve this issue, we should check if the file is opened successfully before writing to it. 

<?php
// Open file in write mode 'w' and check if successful
$file = fopen("htmlSave.dat", "w");
if($file){
    // Write data to the file
    fwrite($file, "<html><body><h1>Hello, World!</h1></body></html>");
    // Close the file
    fclose($file);
    echo "Data written to file successfully.";
} else {
    echo "Error opening file.";
}
?>

Keywords

file_put_contents fopen fwrite fclose error handling

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