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This article mainly shares with you the classes for php to generate verification codes, thumbnails, and watermarks. It is very practical. Friends in need can refer to it.
<?php class image{ session_start(); //验证码类 static public function verify($code,$width=75,$height=25,$n=4){ header("content-type:image/png"); // 创建画布 $img=imagecreatetruecolor($width,$height); // 设置背景色 $bgcolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255)); // 将背景色填充 imagefill($img,0,0,$bgcolor); // 绘制五条弧线 for($i=0;$i<5;$i++){ $arccolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255)); imagearc($img,mt_rand(5,($width-5)),mt_rand(5,($height-5)),mt_rand(5,($width-5)),mt_rand(5,($height-5)),mt_rand(0,360),mt_rand(0,360),$arccolor); } // 绘制一百个点 for($i=0;$i<100;$i++){ $pixelcolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255)); imagesetpixel($img,mt_rand(1,($width-1)),mt_rand(1,($height-1)),$pixelcolor); } // 绘制五条线段 for($i=0;$i<5;$i++){ $linecolor=imagecolorallocate($img,mt_rand(200,255),mt_rand(200,255),rand(200,255)); imageline($img,mt_rand(1,($width-1)),mt_rand(1,($height-1)),mt_rand(1,($width-1)),mt_rand(1,($height-1)),$linecolor); } // 设置边框颜色 $bdcolor=imagecolorallocate($img,mt_rand(150,200),mt_rand(150,200),rand(150,200)); // 绘制一个矩形无填充边框 imagerectangle($img,0,0,($width-1),($height-1),$bdcolor); // 设置验证码字符串 $str=''; for($i=1;$i<=$n;$i++){ $str.=substr(str_shuffle($code),0,1); } $_SESSION['a']=$str; // for($i=0;$i<$n;$i++){ $textcolor=imagecolorallocate($img,mt_rand(100,150),mt_rand(100,150),mt_rand(100,150)); imagettftext($img,1/($n+1)*$width,mt_rand(-20,20),((1-$n/(5+$n))*$width/($n-1)+$i*1/($n+1)*$width),1/2*($height+3/5*$height),$textcolor,'1.ttf',substr($str,$i,1)); } // 打印图像 imagepng($img); // 释放资源 imagedestroy($img); return $str; } //缩略图类 /* *$source需要缩略的图片 */ static public function thumbnail($source,$deletesource=false,$width=180){ $info=getimagesize($source); //getimagesize方法获得图像的详细信息 $createFun=str_replace('/','createfrom',$info['mime']); //将getimagesize中的['mime']中的/替换,变为imagecreatefromjpeg方法 $src=$createFun($source); //创建图像 $dst_w=$width; //缩略图的宽 $dst_h=$width/$info[0]*$info[1]; //计算缩略图的高 $dst=imagecreatetruecolor($dst_w,$dst_h); //新建一个真彩色图像 imagecopyresampled($dst,$src,0,0,0,0,$dst_w,$dst_h,$info['0'],$info['1']); //重采样拷贝部分图像并调整大小 $saveFun=str_replace('/','',$info['mime']); //设置保存函数 $ext=strrchr($source,'.'); //strrchr查找指定字符在字符串中的最后一次出现,返回包括其自身在内的剩余的字符串 $thumbnailName=str_replace($ext,'',$source).'_thumbnail'.$ext; //设置保存路径 if(!$deletesource){ $saveFun($dst,$thumbnailName); //保存图像 }else{ $saveFun($dst,$thumbnailName); unlink($source); //删除原图 } imagedestroy($src); //销毁资源 imagedestroy($dst); //销毁资源 return $thumbnailName; } //水印图类 /* *$srcing水印图 *$dsting原图 */ static public function watermark($dstimg,$srcimg){ $dstinfo=getimagesize($dstimg); //getimagesize方法获取该图片的详细信息(该方法返回的是一个详细的数组) $srcinfo=getimagesize($srcimg); $createdst=str_replace('/','createfrom',$dstinfo['mime']); //将getimagesize方法返回的数组中的mime值中的/替换,结果为imagecreatefromjpeg $createsrc=str_replace('/','createfrom',$srcinfo['mime']); $dst=$createdst($dstimg); //替换后为imagecreatefromjpeg函数,创建一个图像 $dst_w=imagesx($dst); //获取大图的宽 $dst_h=imagesy($dst); //获取大图的高 $src=$createsrc($srcimg); //替换后为imagecreatefromjpeg函数,创建一个图像 $src_w=imagesx($src); //获取水印图的宽 $src_h=imagesy($src); //获取水印图的高 $watermaker=imagecopy($dst,$src,($dst_w-$src_w),($dst_h-$src_h),0,0,$src_w,$src_h); //将水印图复制在大图上 $saveFun=str_replace('/','',$dstinfo['mime']); //将getimagesize返回数组中的['mime']中的斜杠替换为空,替换后的值为imagejpeg,即为保存函数 $ext=strrchr($dstimg,'.'); //strrchr查找指定字符在字符串中的最后一次出现,返回包括其自身在内的剩余的字符串 $watermaker=str_replace($ext,'',$dstimg).'_water'.time().$ext; //保存名 $saveFun($dst,$watermaker); //保存图片,第一个参数为要保存的图片,第二个参数为保存路径或保存名 imagedestroy($dst); //销毁资源 imagedestroy($src); //销毁资源 return $watermaker; } } ?>
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