(PHP Extension) The MIME Content-Type Header Field

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

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.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.

$mime = new CkMime();

// 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->put_ContentType('text/plain');
$mime->put_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->put_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->put_Name('');
print $mime->getEntireHead() . "\n";
print '-' . "\n";

?>