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private function imageAddText($image, array $opt) {
// calculate watermark ÍøÕ¾ºǫ́Éè¼Æ position and get full path to font file
$offset = $this-calculateOffset($image, $opt);
$opt = $this-getFontFullpath($opt);
// ºôÂ×±´¶ûÍøÕ¾½¨É蹫˾ allocate text color
$color = $opt['watermark_text']['color'];
// ÕâÊDz»Í¸Ã÷¶È, ½éÓÚ 0.0 ºÍ 1.0 Ö®¼ä, ¿ÉÒԲο¼ CSS3 ¹ØÓÚ opacity µÄ˵Ã÷.
$opacity = 0.65;
// Add the text to image
$red = hexdec(substr($color, 0, 2));
$green = hexdec(substr($color, 2, 2));
$blue = hexdec(substr($color, 4, 2));
$alpha = (1 - $opacity) * 127;
$style = imagecolorallocatealpha($image, $red, $green, $blue, $alpha);
imagettftext($image, Âí°°É½ÍøÕ¾½¨É蹫˾ $opt['watermark_text']['size'], 0, $offset['x'], $offset['y'], $style, $opt['watermark_text']['font'], $opt['watermark_text']['value']);
return $image;
}
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