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
<?php
header('Content-Type:text/html;charset=utf-8');
/*
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* and open the template in the editor.
*/
//给图片添加水印
Class Water{
//开启水印
private $watermark_on = '1';
public $water_img;
//水印位置
public $pos = 1;
//压缩比
public $pct = 80;
//透明度
public $quality = 80;
public $text = '乐趣网zlblog.sinaapp.com';
public $size = 12;
public $color = '#000000';
public $font = 'font.ttf';
//thumb的制作
//默认缩略图功能开启
private $thumb_on = 1;
//生成缩略图的方式
public $thumb_type = 1;
//生成缩略图的宽度
public $thumb_width;
//生成缩略图的高度
public $thumb_height;
//生成缩略图的后缀名
public $thumb_fix = '_dq';
//缩略图函数处理
public function thumb( $img,$outfile='',$t_type='',$t_w='',$t_h='' ){
//验证图片是否符合要求
if(!$this->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
$img_info = getimagesize($img);
$img_w = $img_info[0];
$img_h = $img_info[1];
//取得图像类型的文件后缀
$img_type = image_type_to_extension($img_info[2]);
//获取到相关尺寸
$thumb_size = $this->thumb_size($img_w,$img_h,$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
$func = "imagecreatefrom".substr($img_type, 1);
$res_img = $func($img);
//缩略图资源 编辑图片资源moon
if( $img_type == '.gif' || $img_type == '.png' ){
$res_thumb = imagecreate($thumb_size[0], $thumb_size[1]);
$color = imagecolorallocate($res_thumb, 255, 0, 0);
}else{
$res_thumb = imagecreatetruecolor($thumb_size[0], $thumb_size[1]);
}
//制作缩略图
if(function_exists( "imagecopyresampled" ) ){
imagecopyresampled($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size[0],$thumb_size[1],$thumb_size[2],$thumb_size[3]);
}else{
imagecopyresized($res_thumb, $res_img, 0, 0, 0, 0, $thumb_size[0],$thumb_size[1],$thumb_size[2],$thumb_size[3]);
}
//处理透明色
if( $img_type =='.gif' || $img_type == '.png' ){
imagecolortransparent($res_thumb,$color);
}
//配置输出文件名
$outfile = $outfile ? $outfile : $outfile.substr($img,0,strripos($img,'.')).$this->thumb_fix.$img_type;
//文件的保存输出
$func = "image".substr($img_type, 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='',$out_img='',$water_img='',$text='' ){
if(!$this->check($img) || !$this->watermark_on) return false;
$water_img = $water_img ? $water_img : $this->water_img;
//水印的开启状态
$waterimg_on = $this->check($water_img) ? 1 : 0;
//判断是否在原图上操作
$out_img = $out_img ? $out_img : $img;
//判断水印的位置
$pos = $pos ? $pos : $this->pos;
//水印文字
$text = $text ? $text : $this->text;
$img_info = getimagesize($img);
$img_w = $img_info[0];
$img_h = $img_info[1];
//判断水印图片的类型
if( $waterimg_on ){
$w_info = getimagesize($water_img);
$w_w = $w_info[0];
$w_h = $w_info[1];
if ( $img_w < $w_w || $img_h < $w_h ) return false;
switch ( $w_info[2] ){
case 1:
$w_img = imagecreatefromgif($water_img);
break;
case 2:
$w_img = imagecreatefromjpeg($water_img);
break;
case 3:
$w_img = imagecreatefrompng($water_img);
break;
}
}else{
if( empty($text) || strlen($this->color)!=7 ) return FALSE;
$text_info = imagettfbbox($this->size, 0, $this->font, $text);
$w_w = $text_info[2] - $text_info[6];
$w_h = $text_info[3] - $text_info[7];
}
//建立原图资源
switch ( $img_info[2] ){
case 1:
$res_img = imagecreatefromgif($img);
break;
case 2:
$res_img = imagecreatefromjpeg($img);
break;
case 3:
$res_img = imagecreatefrompng($img);
break;
}
//确定水印的位置
switch ( $pos ){
case 1:
$x = $y =25;
break;
case 2:
$x = ($img_w - $w_w)/2;
$y = 25;
break;
case 3:
$x = $img_w - $w_w;
$y = 25;
break;
case 4:
$x = 25;
$y = ($img_h - $w_h)/2;
break;
case 5:
$x = ($img_w - $w_w)/2;
$y = ($img_h - $w_h)/2;
break;
case 6:
$x = $img_w - $w_w;
$y = ($img_h - $w_h)/2;
break;
case 7:
$x = 25;
$y = $img_h - $w_h;
break;
case 8:
$x = ($img_w - $w_w)/2;
$y = $img_h - $w_h;
break;
case 9:
$x = $img_w - $w_w;
$y = $img_h - $w_h;
break;
default :
$x = mt_rand(25, $img_w - $w_w);
$y = mt_rand(25, $img_h - $w_h);
}
//写入图片资源
if( $waterimg_on ){
imagecopymerge($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 ( $img_info[2] ){
case 1:
imagecreatefromgif($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');
$img_type = strtolower(strrchr($img, '.'));
return extension_loaded('gd') && file_exists($img) && in_array($img_type, $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( $img_w,$img_h,$t_w,$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 = $img_w;
$cut_h = $img_h;
//当要目标图像小于缩略图的尺寸时；
if( $img_w <= $t_w && $img_h < $t_h ){
$w = $img_w;
$h = $img_h;
}else{
if( !empty($t_type) && $t_type>0 ){
switch ( $t_type ){
//当宽度固定时
case 1:
$h = $t_w/$img_w*$img_h;
break;
//高度固定时
case 2:
$w = $t_h/$img_h*$img_w;
break;
//宽度固定，高度裁切
case 3:
$cut_h = $img_w/$t_w*$t_h;
break;
//高度固定，宽度裁切
case 4:
$cut_w = $img_h/$t_h*$t_w;
break;
//等比例缩放
default :
if( ($img_w/$t_w) > ($img_h/$t_h) ){
$h = $t_w/$img_w*$t_h;
}elseif( ($img_w/$t_w) < ($img_h/$t_h) ){
$w = $t_h/$img_h*$t_w;
}else{
$w = $t_w;
$h = $t_h;
}
}
}
}
$arr[0] = $t_w;
$arr[1] = $t_h;
$arr[2] = $cut_w;
$arr[3] = $cut_h;
return $arr;
}
}
以上就是本文的全部内容，希望对大家学习PHP程序设计有所帮助。
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