Php search path

Shell Programming and Scripting
1

Probably simple, but I don't see it.

jack@veritron /u/email $ cat p3.php
<?php
require_once './lib/swift_required.php';
$x=get_include_path();
echo "$x \n";
set_include_path('./lib:./lib/classes:'.$x);
$x=get_include_path();
echo "$x \n";
$transport = SmtpTransport::newInstance('smtp.postmarkapp.com',587)
    ->setUsername('abcdefghijkl')
    ->setPassword('abcdefghijkl')
;
echo "line 4\n";
?>
jack@veritron /u/email $ php ./p3.php
.:/usr/local/lib/php 
./lib:./lib/classes:.:/usr/local/lib/php 

Fatal error: Uncaught Error: Class 'SmtpTransport' not found in /u/email/p3.php:8
Stack trace:
#0 {main}
  thrown in /u/email/p3.php on line 8
jack@veritron /u/email $ find ./ -name SmtpTransport.php -print
./SmtpTransport.php
./lib/classes/Swift/SmtpTransport.php
./classes/Swift/SmtpTransport.php
jack@veritron /u/email $
2

I don't know php, but maybe

set_include_path('./lib:./lib/classes:./lib/classes/Swift:' . $x);