imagestringup()

(PHP 4, PHP 5, PHP 7)

垂直地画一行字符串

说明

imagestringup(resource $image,int $font,int $x,int $y,string $s,int $col): bool

imagestring()用$col颜色将字符串$s垂直地画到$image所代表的图像的$x,$y座标处（图像的左上角为 0, 0）。如果$font是 1，2，3，4 或 5，则使用内置字体。

参见imageloadfont()。

function imagestringdown(&$image, $font, $x, $y, $s, $col)
{
  $width = imagesx($image);
  $height = imagesy($image);
  
  $text_image = imagecreate($width, $height);
  $white = imagecolorallocate ($text_image, 255, 255, 255);
  $black = imagecolorallocate ($text_image, 0, 0, 0); 
  $transparent_colour = $white;
  if ($col == $white)
   $transparent_color = $black;
 
  imagefill($text_image, $width, $height, $transparent_colour);
  imagecolortransparent($text_image, $transparent_colour);
 
  imagestringup($text_image, $font, ($width - $x), ($height - $y), $s, $col);
  imagerotate($text_image, 180.0, $transparent_colour);
 
  imagecopy($image, $text_image, 0, 0, 0, 0, $width, $height);
}