How can PHP scripts efficiently handle the validation of multiple email addresses stored in a file?

To efficiently handle the validation of multiple email addresses stored in a file, you can read the file line by line, validate each email address using a regular expression, and then store the valid email addresses in an array for further processing. 

<?php
// Open the file containing email addresses
$file = fopen('email_addresses.txt', 'r');

// Initialize an empty array to store valid email addresses
$valid_emails = [];

// Read the file line by line
while (!feof($file)) {
    $email = trim(fgets($file)); // Get the email address and remove any whitespace
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) { // Validate the email address
        $valid_emails[] = $email; // Add the valid email address to the array
    }
}

// Close the file
fclose($file);

// Print out the valid email addresses
foreach ($valid_emails as $email) {
    echo $email . "\n";
}
?>

Keywords

PHP email validation file handling regular expressions error handling

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