(PHP 4)
swf_definefont — Defines a font
The swf_definefont() function defines a font given by the fontname parameter and gives it the id specified by the fontid parameter. It then sets the font given by fontname to the current font.
<?php
    # Show seven fonts in random sizes and colors.
    # Reload to see the changes
    header("Content-type: application/x-shockwave-flash");
    # Higher values for $frames make it quicker!
    $frames = 1;
    swf_openfile("php://stdout", 256, 256, $frames, .9, .9, .9);
    #    Viewport. Bigger values give a bigger viewport and tinier content
    define("VIEWPORT", 150);
    swf_ortho2(-VIEWPORT, VIEWPORT, -VIEWPORT, VIEWPORT);
    #    Start with empty frame
    swf_showframe();
    $tmp = 500;
    $fontnum = -1;
    $fonts = explode(",", "Curl-Roman,Haeberli,Inja,Ligon-Bold,Ligon-Roman,Mod,Pix3");
    swf_translate(-100, 100, 0);
    for( $i = 0; $i< sizeof( $fonts ); $i++ ){
        swf_addcolor(rnd01(), rnd01(), rnd01(), 0);
        swf_definefont(++$fontnum, $fonts[$i]);
        swf_fontsize( rand(6,45) );
        # Show font name. Remove "-" from font name as Curl-Roman does not support that character!
        swf_definetext(++$tmp, str_replace("-", "", $fonts[$i] ), 0);
        swf_translate(0, -20, 0);
        swf_placeobject($tmp, 60);
        swf_showframe();
    }
    swf_closefile();
    #    Return random color value i.e. value between 0 and 1
    function rnd01(){ return (mt_rand(0,0xFF) / 0xFF); }
?>
These are the standard fonts that I have found so far that come with this engine.
"Curl-Roman"
"Haeberli"
"Inja"
"Ligon-Bold"
"Ligon-Roman"
"Mod"
"Pix3"
Most of them are not too great but they are the only ones that come by default.  There are ways to convert other fonts so that you can use them.  I haven't converted any yet so I don't know for sure how well it works.