本文实现的功能特别适用于一些商城和图片站中，分享了图片在上传时添加文字和图片水印的技巧，供大家参考，具体内容如下
1. water.class.php
check($img) || !$this->watermark_on) return false;
$water_$water_$water_$this->water_img;
//水印的开启状态
$water$this->check($water_img) ? 1 : 0;
//判断是否在原图上操作
$out_$out_$out_$img;
//判断水印的位置
$pos = $pos ? $pos : $this->pos;
//水印文字
$text = $text ? $text : $this->text;
$($img);
$$;
$$;
//判断水印图片的类型
if( $water){
$w_info = getimagesize($water_img);
$w_w = $w_info;
$w_h = $w_info;
if ( $)!=7 ) return FALSE;
$text_info = imagettfbbox($this->size, 0, $this->font, $text);
$w_w = $text_info - $text_info;
$w_h = $text_info - $text_info;
}
//建立原图资源
switch ( $ ){
case 1:
$res_($img);
break;
case 2:
$res_($img);
break;
case 3:
$res_($img);
break;
}
//确定水印的位置
switch ( $pos ){
case 1:
$x = $y =25;
break;
case 2:
$x = ($- $w_w)/2;
$y = 25;
break;
case 3:
$x = $- $w_w;
$y = 25;
break;
case 4:
$x = 25;
$y = ($- $w_h)/2;
break;
case 5:
$x = ($- $w_w)/2;
$y = ($- $w_h)/2;
break;
case 6:
$x = $- $w_w;
$y = ($- $w_h)/2;
break;
case 7:
$x = 25;
$y = $- $w_h;
break;
case 8:
$x = ($- $w_w)/2;
$y = $- $w_h;
break;
case 9:
$x = $- $w_w;
$y = $- $w_h;
break;
default :
$x = mt_rand(25, $- $w_w);
$y = mt_rand(25, $- $w_h);
}
//写入图片资源
if( $water){
imagecopymerge($res_img, $w_img, $x, $y, 0, 0, $w_w, $w_h, $this->pct);
}else{
$r = hexdec(substr($this->color, 1,2));
$g = hexdec(substr($this->color, 3,2));
$b = hexdec(substr($this->color, 5,2));
$color = imagecolorallocate($res_img, $r, $g, $b);
imagettftext($res_img, $this->size, 0, $x, $y, $color, $this->font, $text);
}
//生成图片类型
switch ( $ ){
case 1:
imagecreatefromgif($res_img,$out_img);
break;
case 2:
//imagecreatefromjpeg($res_img,$out_img);
imagejpeg($res_img,$out_img);
break;
case 3:
imagejpeg($res_img,$out_img);
break;
}
if(isset($res_img)) imagedestroy ($res_img);
if(isset($w_img))imagedestroy($w_img);
return TRUE;
}
//验证图片是否存在
private function check($img){
$type = array('.jpg','.jpeg','.png','.gif');
$(strrchr($img, '.'));
return extension_loaded('gd') && file_exists($img) && in_array($, $type);
}
}
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