画像のサムネイルを生成する別の機能

function photoThumb($p_thumb_file, $p_photo_file, $p_max_size, $p_quality = 75) {

 $pic = @imagecreatefromjpeg($p_photo_file);
    if ($pic) {
 $thumb = @imagecreatetruecolor ($p_max_size, $p_max_size) or die ("画像を作成できません!");
 $width = imagex($pic);
 $height = imagey($pic );
 if ($width < $height) {
 $twidth = $p_max_size;
 $theight = $twidth * $height / $width;
 imagecopyresize($thumb, $pic, 0, 0, 0, ($height/2)-($width/2), $twidth, $theight, $width, $height);
 } else {
 $theight = $p_max_size;
 $twidth = $theight * $width / $height;
 imagecopyresize($thumb, $pic, 0, 0, ($width/2)-($height/2), 0, $twidth, $theight, $width, $height);
 }
        ImageJPEG ($thumb, $p_thumb_file, $p_quality);
 }
}
?>