php - imagettftext not working for me -

i have function takes images , combines them single wide image. seems work. trying put text on images , not.

the 5 lines after: // allocate color text, ones added create text. there i'm missing? don't see errors when run code.

 function merge($filename_w, $filename_x, $filename_y, $filename_z,$filename_result, $text) {   // dimensions specified images  list($width_w, $height_w) = getimagesize($filename_w);  list($width_x, $height_x) = getimagesize($filename_x);  list($width_y, $height_y) = getimagesize($filename_y);  list($width_z, $height_z) = getimagesize($filename_z);  // create new image desired dimensions  $image = imagecreatetruecolor($width_w + $width_x + $width_y + $width_z, $height_x);  // load images , copy destination image $image_w = imagecreatefromjpeg($filename_w);  $image_x = imagecreatefromjpeg($filename_x);  $image_y = imagecreatefromjpeg($filename_y); $image_z = imagecreatefromjpeg($filename_z);  imagecopy($image, $image_w, 0, 0, 0, 0, $width_w, $height_w);  imagecopy($image, $image_x, $width_w, 0, 0, 0, $width_x, $height_x);  imagecopy($image, $image_y, $width_w + $width_x, 0, 0, 0, $width_y, $height_y);  imagecopy($image, $image_z, $width_w + $width_x + $width_y, 0, 0, 0, $width_z, $height_z);       // allocate color text       $white = imagecolorallocate($image, 255, 255, 255);       // set path font file       $font_path = './tahoma.ttf';       // print text on image       imagettftext($image, 25, 0, 75, 300, $white, $font_path, "test text");  // save resulting image disk (as jpeg)  imagejpeg($image, $filename_result);  // clean  imagedestroy($image);  imagedestroy($image_w);  imagedestroy($image_x);  imagedestroy($image_y);  imagedestroy($image_z); }