What are the potential pitfalls of trying to write to the first line of a text file using PHP's fwrite function?

When trying to write to the first line of a text file using PHP's fwrite function, one potential pitfall is that the existing content of the file will be overwritten. To avoid this, you can read the existing content of the file, prepend the new content to it, and then write the updated content back to the file. 

$file = 'example.txt';
$newContent = "New content to be added\n";

// Read existing content
$existingContent = file_get_contents($file);

// Prepend new content to existing content
$updatedContent = $newContent . $existingContent;

// Write updated content back to the file
file_put_contents($file, $updatedContent);

Keywords

PHP fwrite text file first line potential errors

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