(PHP ActiveX) The MIME Content-Type Header Field

Explains the ContentType property and the Content-Type header field including the various attributes that may be included.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// Every part in a MIME messsage should include a Content-Type header field.
// The Content-Type indicates the type of content contained in the MIME part.
// For example: text/plain, image/jpeg, application/pdf, application/json, multipart/mixed, etc.

// Multipart content types are those where the MIME part's body is composed of N inner MIME messages,
// separated by a boundary string.
// This is how MIME gets a nested, tree-like structure.  The most common multipart MIME types
// are (for email related MIME) multipart/mixed, multipart/alternative, and multipart/related,
// and for HTTP related MIME, it is multipart/form-data.

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Mime')
$mime = new COM("Chilkat.Mime");

// The Content-Type header field can be set or modified in two ways.
// 1) By setting the ContentType, Micalg, Name, Charset, Boundary, or Protocol properties.
//    Setting the ContentType property sets the primary value (such as "text/plain") of the header field.
//    Each of the other properties listed above will replace or add a particular attribute value.

// 2) By setting the entire contents of the ContentType header with the SetHeaderField method.
//    This updates each of the Content-Type related properties.

// For example:
$mime->ContentType = 'text/plain';
$mime->Charset = 'utf-8';

// The Content-Type header field contains this:
//     Content-Type: text/plain; charset=utf-8
print $mime->getEntireHead() . "\n";
print '-' . "\n";

$mime->SetHeaderField('Content-Type','image/jpeg; name=\'kitty.jpg\'');
// The Content-Type header field now contains this:
//     Content-Type: image/jpeg; name="kitty.jpg"
print $mime->getEntireHead() . "\n";
print '-' . "\n";

// Notice how the properties have been updated:
print 'ContentType property: ' . $mime->ContentType . "\n";
print 'Charset property: ' . $mime->Charset . "\n";
print 'Name property: ' . $mime->Name . "\n";
print '-' . "\n";

// To change a particular attribute value, set the property.
$mime->Name = 'doggy.jpg';
print $mime->getEntireHead() . "\n";
print '-' . "\n";

// To remove an attribute value from the Content-Type header,
// set the property to an empty string.
$mime->Name = '';
print $mime->getEntireHead() . "\n";
print '-' . "\n";

?>