How to set php.ini variables in web.config file to make contact form work?

<!-- Contact Form - START -->
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);>"id="contactform" style="right:-433px;">
<?php // Initialize variables to null.
$name =""; // Sender's Name
$organization =""; // Sender's organization
$email =""; // Sender's email ID
$phone =""; //Sender's phone number
$message =""; // Sender's Message
$nameError ="";
$organizationError ="";
$emailError ="";
$phoneError ="";
$messageError ="";
$successMessage =""; // On submittingform below function will execute.

if(isset($_POST['submit'])) { // Checking null values in message.
if (empty($_POST["name"])){
$nameError = "Please enter your full name.";
}
else {
$name = test_input($_POST["name"]); // check name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$name)){
    $nameError = "Only letters and white space allowed";
}
} // Checking null values inthe message.

if (empty($_POST["organization"])) {
$organizationError = "Please enter the name of your organization.";
}
else {
$organization = test_input($_POST["organization"]);
} // Checking null values in message.

if (empty($_POST["email"])) {
$emailError = "Please enter your email address.";
}
else {
$email = test_input($_POST["email"]);
} // Checking null values inmessage.

if (empty($_POST["phone"])) {
$phoneError = "Please enter your phone number.";
}
else {
$phone = test_input($_POST["phone"]);
} // Checking null values in message.

if (empty($_POST["message"])) {
$messageError = "Please enter your message.";
}
else {
$message = test_input($_POST["message"]);
} // Checking null values in the message.

if( !($name=='') && !($email=='') && !($organization=='') &&!($message=='') )
{ // Checking valid email.
if (preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
{
$header= "From: $email"; 
/* Let's prepare the message for the e-mail */
$msg = "Hello $name! Thank you for contacting us!
Name: $name
Organization: $organization
E-mail: $email
Phone: $phone
Message: $message
This is a contact confirmation email. We will contact you as soon as possible.";
$msg1 = "$name contacted us. Here is some information about $name.
Name: $name
Organization: $organization
E-mail: $email
Phone: $phone
Message: $message "; /* Send the message using mail() function */
if(mail($email, "Contact Confirmation", $msg, "From: someone@example.com" ) && mail("sometwo@example.com", "Web Inquiry", $msg1, $header  ))
{
$successMessage = "Message sent successfully.";
}
}
else
{ $emailError = "Invalid Email";
}
}
} // Function for filtering input values.

function test_input($data)
{
$data = trim($data);
$data =stripslashes($data);
$data =htmlspecialchars($data);
return $data;
}
?>

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<div id="sidebar" onclick="open_panel()"><img src="images/Contact-Us.png"></div>
<div id="contactheader">
<h2>Contact Us</h2>
<p id="contactp">Please fill out the form below and we will contact you shortly.</p>
<input name="name" type="text" placeholder="Full Name" value="">
<span class="error"><?php echo $nameError;?></span>
<input name="organization" type="text" placeholder="Organization" value="">
<span class="error"><?php echo $organizationError;?></span>
<input name="email" type="text" placeholder="Email" value="">
<span class="error"><?php echo $emailError;?></span>
<input name="phone" type="text" placeholder="Phone Number">
<h4>Query type</h4>
<select>
    <option>General Query</option>
    <option>Query 1</option>
    <option>Query 2</option>
    <option>Query 3</option>
    <option>Query 4</option>
    <option>Query 5</option>
</select>
<textarea name="message" val="" placeholder="Message.."></textarea>
<span class="error"><?php echo $messageError;?></span>
<h4>How would you like to be contacted?</h4>
<select>
    <option>Phone</option>
    <option>Email</option>
</select>
<input class="submit" type="submit" name="submit" value="Submit" id="contactbutton">
<span class="success"><?php echo $successMessage;?></span>
</div>

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<?php // demo/form_to_email.php
/**
 * Use PHP to Send Email from an HTML Form
 */
error_reporting(E_ALL);


// REQUIRED VALUES ARE PREPOPULATED - CHANGE THESE FOR YOUR WORK
$from = 'NoReply@Your.org';
$subj = 'Contact Form';

// THIS IS AN ARRAY OF RECIPIENTS - CHANGE THESE FOR YOUR WORK
$to[] = 'You@Your.org';
$to[] = 'Her@Your.org';
$to[] = 'Him@Your.org';


// IF THE DATA HAS BEEN POSTED (AT LEAST SOMETHING IN THE EMAIL INPUT CONTROL)
if (!empty($_POST['e']))
{
    // CLEAN UP THE POTENTIALLY BAD AND DANGEROUS DATA
    $safe_mail = clean_string($_POST['e']);
    $safe_name = clean_string($_POST['n']);
    $safe_fone = clean_string($_POST['t']);
    $safe_idea = clean_string($_POST['i']);

    // CONSTRUCT THE MESSAGE THROUGH STRING CONCATENATION
    $content = NULL;
    $content .= "You have a New Query From $safe_name" . PHP_EOL . PHP_EOL;
    $content .= "Tel No: $safe_fone" . PHP_EOL;
    $content .= "Email: $safe_mail" . PHP_EOL;
    $content .= "Idea: $safe_idea" . PHP_EOL;

    // SEND MAIL TO EACH RECIPIENT
    foreach ($to as $recipient)
    {
        if (!mail( $recipient, $subj, $content, "From: $from\r\n"))
        {
            echo PHP_EOL . "<br/>MAIL FAILED FOR $recipient";
        }
        else
        {
            echo PHP_EOL . "<br/>MAIL WORKED FOR $recipient";
        }
    }

    // PRODUCE THE THANK-YOU PAGE
    echo '<p>THANK YOU</p>' . PHP_EOL;
    die('TASK COMPLETE');
}


// A FORM TO TAKE CLIENT INPUT FOR THIS SCRIPT
$form = <<<ENDFORM
<form method="post">
Please enter your contact information
<br/>Email: <input name="e" />
<br/>Phone: <input name="t" />
<br/>Name:  <input name="n" />
<br/>Ideas? <textarea name="i"></textarea>
<br/><input type="submit" />
</form>
ENDFORM;

echo $form;


// A FUNCTION TO CLEAN UP THE DATA - AVOID BECOMING AN OPEN-RELAY FOR SPAM
function clean_string($str)
{
    // IF MAGIC QUOTES IS ON, WE NEED TO REMOVE SLASHES
    $str = stripslashes($str);

    // REMOVE EXCESS WHITESPACE
    $rgx
    = '#'                // REGEX DELIMITER
    . '\s'               // MATCH THE WHITESPACE CHARACTER(S)
    . '\s+'              // MORE THAN ONE CONTIGUOUS INSTANCE OF WHITESPACE
    . '#'                // REGEX DELIMITER
    ;
    $str = preg_replace($rgx, ' ', $str);

    // REMOVE UNWANTED CHARACTERS
    $rgx
    = '#'                // REGEX DELIMITER
    . '['                // START OF A CHARACTER CLASS
    . '^'                // NEGATION - MATCH NONE OF THE CHARACTERS IN THIS CLASS
    . 'A-Z0-9'           // KEEP LETTERS AND NUMBERS
    . '"'                // KEEP DOUBLE QUOTES
    . "'"                // KEEP SINGLE QUOTES
    . '@&+:?_.,/\-'      // KEEP SOME SPECIAL CHARACTERS (NOTE ESCAPED HYPHEN)
    . ' '                // KEEP BLANKS
    . ']'                // END OF THE CHARACTER CLASS
    . '#'                // REGEX DELIMITER
    . 'i'                // CASE-INSENSITIVE
    ;
    $str = preg_replace($rgx, NULL, $str);

    // REMOVE EXCESSIVE INPUT
    $str = substr($str, 0, 255);

    return trim($str);
}

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