How Can I Write Data from an HTML Form to a Text File Using PHP?

PHP: Writing Input Data to a Text File

In PHP, you can easily write data from an input field to a text file. Here's how to accomplish this task:

1. HTML Form:

<form action="myprocessingscript.php" method="POST">
    <input name="field1" type="text" />
    <input name="field2" type="text" />
    <input type="submit" name="submit" value="Save Data" />
</form>

2. PHP Script:

<?php
if (isset($_POST['field1']) && isset($_POST['field2'])) { // Check if both fields are set
    $data = $_POST['field1'] . '-' . $_POST['field2'] . "\r\n"; // Create the data
    $result = file_put_contents('data.txt', $data, FILE_APPEND | LOCK_EX); // Write to the file
    if ($result === false) {
        die('Error writing to file'); // Handle error
    } else {
        echo "$result bytes written to file"; // Success
    }
} else {
    die('No post data to process'); // Handle error
}
?>

Explanation:

• The HTML form collects user input in two fields (field1 and field2) and submits it to the processing script via the POST method.
• The PHP script checks if both fields are set to prevent errors.
• If the fields are set, it concatenates the input values with a hyphen and appends a newline character to create a data string.
• The file_put_contents function opens the file data.txt for writing in append mode, locking it for exclusive access.
• The data string is written to the file, and the number of bytes written is returned. If the write operation is successful, the result is echoed; otherwise, an error message is displayed.

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