How can PHP functions be effectively utilized to read and process data from a text file for input filtering purposes?

To read and process data from a text file for input filtering purposes in PHP, you can create a function that reads the file line by line, filters the input using PHP's built-in functions like filter_var(), and then processes the filtered data as needed. 

<?php
// Function to read and process data from a text file
function processTextFile($filename) {
    $file = fopen($filename, "r");
    if ($file) {
        while (($line = fgets($file)) !== false) {
            // Filter the input data
            $filteredData = filter_var($line, FILTER_SANITIZE_STRING);
            
            // Process the filtered data
            echo $filteredData . "<br>";
        }
        fclose($file);
    } else {
        echo "Error opening file.";
    }
}

// Usage
$filename = "data.txt";
processTextFile($filename);
?>

Keywords

PHP functions text file input filtering data processing file handling

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