I need to create a mailto link from PHP code

Ok, so at the moment my html form gathers data and posts it to a php form which then creates and sends an email (following code), however now I need the form to create a mailto link so I can send it to a different mail account from my iphone6, any help please???!! :)

The code is:

<?php
ini_set( "SMTP", "localhost" );
ini_set( "smtp_port", "25" );

if ( isset( $_POST['caseref'] ) ) {

    $email_from = "dave@dave.com";
    $to = "dave@dave.com";
    $email_subject = "Arrival:  " . $_POST['caseref'];

    function died( $error ) {
        // error code here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error . "<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }

    // validation expected data exists
    if ( !isset( $_POST['casreref'] ) ) {
        #died('We are sorry, but there appears to be a problem with the form you submitted.');
    }

    $name = $_POST['name']; // required
    $caseref = $_POST['caseref']; // required
    $notes = $_POST['notes']; // required

    $error_message = "";

    $email_message .= "Incident Number: " . $caseref . "\n";
    $email_message .= "Arrival Date:" . date( " d/m/Y " );
    $email_message .= "\n";
    $email_message .= "Arrival Time:" . date( "  H:i  ", time() );
    $email_message .= "\n";
    $email_message .= "Engineer:  " . $name . " \n";
    $email_message .= "Engineers Notes:  " . $notes;
    $email_message .= "\n";
    $email_message .= "\n";
    $email_message .= "\n";


    $headers = 'From: ' . $email_from;
    mail( $to, $email_subject, $email_message, $headers );
    ?>
    <!-- include your own success html here -->
    <html>
        <title>Thank you!</title>

        Mailto link needs to go here

<?php
}
?>

Can anyone help me out with this at all please?

The email needs to look like:

mailto: davey@dave.com

subject: Arrival

body: Incident Number:XXXXXX

Arrival Date: 20/11/2015

Arrival Time: 14:41

Engineer: Dave

Engineers Notes:

Solution

As we've been discussing, you need to use NVP in the mailto link. For your newline breaks to be respected, you need to use urlencode() or rawurlencode() depending on email clients and how they respect encoding.

$to = "dave@dave.com";
$caseref = "123";
$name = "Bob";
$notes = "Some notes";
$email_subject = "Arrival some data";
$email_message = "Incident Number: " . $caseref . "\n";
$email_message .= "Arrival Date:" . date("d/m/Y");
$email_message .= "\n";
$email_message .= "Arrival Time:" . date("H:i");
$email_message .= "\n";
$email_message .= "Engineer:  " . $name . " \n";
$email_message .= "Engineers Notes:  " . $notes;
$email_message .= "\n";
$email_message .= "\n";
$email_message .= "\n";

// Echo the mail to link
echo '<a href="mailto:'.$to.'?subject='.urlencode($email_subject).'&body='.urlencode($email_message).'">Mail to Link</a>';

// Echo the mail to link using the different encoding
echo '<a href="mailto:'.$to.'?subject='.rawurlencode($email_subject).'&body='.rawurlencode($email_message).'">Mail to Link</a>';

Also note: I've removed the time() from your date() function since by default time() is used...specifying it is not necessary.