本文实例为大家分享了php水印和缩略图制作代码，使用面向对象的方法来实现常见图片格式jpg，png，gif的水印和缩略图的制作，供大家参考，具体内容如下
check($img) || !$this->thumb_on) return FALSE;
//定义缩略图的初始值
$t_type = $t_type ? $t_type : $this->thumb_type;
$t_w = $t_w ? $t_w : $this->thumb_width;
$t_h = $t_h ? $t_h : $this->thumb_height;
//获取到原图的信息
$($img);
$$;
$$;
//取得图像类型的文件后缀
$($);
//获取到相关尺寸
$thumb_size = $this->thumb_size($,$,$t_w,$t_h,$t_type);
//确定原始图像类型
//利用自定义函数来实现图片类型的确定
$func = "imagecreatefrom".substr($, 1);
$res_$func($img);
//缩略图资源 编辑图片资源moon
if( $'.gif' || $'.png' ){
$res_thumb = imagecreate($thumb_size, $thumb_size);
$color = imagecolorallocate($res_thumb, 255, 0, 0);
}else{
$res_thumb = imagecreatetruecolor($thumb_size, $thumb_size);
}
//制作缩略图
if(function_exists( "imagecopyresampled" ) ){
imagecopyresampled($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size,$thumb_size,$thumb_size,$thumb_size);
}else{
imagecopyresized($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size,$thumb_size,$thumb_size,$thumb_size);
}
//处理透明色
if( $'.gif' || $'.png' ){
imagecolortransparent($res_thumb,$color);
}
//配置输出文件名
$outfile = $outfile ? $outfile : $outfile.substr($img,0,strripos($img,'.')).$this->thumb_fix.$;
//文件的保存输出
$func = "image".substr($, 1);
$func($res_thumb,$outfile);
if(isset($res_thumb)) imagedestroy ($res_thumb);
if(isset($res_img)) imagedestroy ($res_img);
return $outfile;
}
public function watermark( $img,$pos='',$out_'',$water_'',$text='' ){
if(!$this->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:
imagepng($res_img,$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);
}
//获取缩略图的相关比例
//获取到图片的处理类型
private function thumb_size( $,$,$t_w,$t_h,$t_type){
//定义缩略图尺寸
$w = $t_w;
$h = $t_h;
//定义图片的原始尺寸
$cut_w = $;
$cut_h = $;
//当要目标图像小于缩略图的尺寸时；
if( $){
switch ( $t_type ){
//当宽度固定时
case 1:
$h = $t_w/$*$;
break;
//高度固定时
case 2:
$w = $t_h/$*$;
break;
//宽度固定，高度裁切
case 3:
$cut_h = $$t_w*$t_h;
break;
//高度固定，宽度裁切
case 4:
$cut_w = $$t_h*$t_w;
break;
//等比例缩放
default :
if( ($$t_w) > ($$t_h) ){
$h = $t_w/$*$t_h;
}elseif( ($$t_w)
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