PHP

Add a MIME Header Field

Demonstrates the Chilkat Mime.AddHeaderField method, which appends a new header field. The first argument is the field name and the second is the value. Existing fields with the same case-insensitive name are preserved, so this can create duplicates.

Background: MIME headers are ordered name/value lines, and some — Received, for instance — legitimately appear more than once. AddHeaderField is the tool for that: it always appends, never replacing an existing field of the same name. When you instead want exactly one field with a given name, use SetHeaderField, which replaces rather than accumulates.

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<?php

use Chilkat2\Mime;

// Demonstrates the Mime.AddHeaderField method, which appends a new header field.  The 1st argument
// is the field name and the 2nd is the value.  Existing fields with the same (case-insensitive)
// name are preserved, so this can create duplicate fields.

$mime = new Mime();

try {
    $mime->SetBodyFromPlainText('Hello.');

    // Append header fields.  AddHeaderField does not replace existing fields of the same name.
    $mime->AddHeaderField('X-Custom-Header', 'value1');

    $mime->AddHeaderField('X-Priority', '3');

    $headers = $mime->GetEntireHead();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $headers, "\n";