What are some best practices for handling and manipulating data from external files in PHP?

When handling and manipulating data from external files in PHP, it is important to sanitize and validate the data to prevent security vulnerabilities and errors. One best practice is to use functions like file_get_contents() or fopen() to read the file contents, and then process the data accordingly. Additionally, consider using file_put_contents() or fwrite() to write data back to the external file. 

// Read data from an external file
$filename = 'data.txt';
$data = file_get_contents($filename);

// Sanitize and validate the data
$data = htmlspecialchars($data);
$data = trim($data);

// Manipulate the data
$newData = strtoupper($data);

// Write data back to the external file
file_put_contents($filename, $newData);

Keywords

file_get_contents fopen fwrite fgetcsv error handling

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