本文实例讲述了php图像处理类。分享给大家供大家参考。具体如下：
filename = $filename; if ($this->filename) { $this->getsrcimageinfo(); } } /** * 取源图像信息 * @access private * @return void */ private function getsrcimageinfo() { $info = $this->getimageinfo(); $this->imagewidth = $info[0]; $this->imageheight = $info[1]; $this->imagetype = $info[2]; $this->width = $info[0]; $this->height = $info[1]; $this->type = $info[2]; } /** * 取图像信息 * @param string $filename 文件名 * @access private * @return array */ private function getimageinfo($filename = null) { if ($filename==null) { $filename = $this->filename; } $info = getimagesize($filename); return $info; } /** * 创建源图像gd 资源 * @access private * @return void */ private function createsrcimage () { $this->imageresource = $this->createimagefromfile(); } /** * 跟据文件创建图像gd 资源 * @param string $filename 文件名 * @return gd resource */ public function createimagefromfile($filename = null) { if (!$filename) { $filename = $this->filename; $imgtype = $this->imagetype; } if (!is_readable($filename) || !file_exists($filename)) { throw new exception('unable to open file ' . $filename . ''); } if (!$imgtype) { $imageinfo = $this->getimageinfo($filename); $imgtype = $imageinfo[2]; } switch ($imgtype) { case imagetype_gif: $tempresource = imagecreatefromgif($filename); break; case imagetype_jpeg: $tempresource = imagecreatefromjpeg($filename); break; case imagetype_png: $tempresource = imagecreatefrompng($filename); break; case imagetype_wbmp: $tempresource = imagecreatefromwbmp($filename); break; case imagetype_xbm: $tempresource = imagecreatefromxbm($filename); break; default: throw new exception('unsupport image type'); } return $tempresource; } /** * 改变图像大小 * @param int $width 宽 * @param int $height 高 * @param string $flag 一般而言,允许截图则用4,不允许截图则用1; 假设要求一个为4:3比例的图像,则:4=如果太长则自动刪除一部分 0=长宽转换成参数指定的 1=按比例缩放,自动判断太长还是太宽,长宽约束在参数指定内 2=以宽为约束缩放 3=以高为约束缩放 * @param string $bgcolor 如果不为null,则用这个参数指定的颜色作为背景色,并且图像扩充到指定高宽,该参数应该是一个数组; * @return string */ public function resizeimage($width, $height, $flag=1, $bgcolor=null) { $widthratio = $width/$this->imagewidth; $heightratio = $height/$this->imageheight; switch ($flag) { case 1: if ($this->imageheight imagewidth imagewidth; $endheight = $this->imageheight; //return; } elseif (($this->imageheight * $widthratio)>$height) { $endwidth = ceil($this->imagewidth * $heightratio); $endheight = $height; } else { $endwidth = $width; $endheight = ceil($this->imageheight * $widthratio); } break; case 2: $endwidth = $width; $endheight = ceil($this->imageheight * $widthratio); break; case 3: $endwidth = ceil($this->imagewidth * $heightratio); $endheight = $height; break; case 4: $endwidth2 = $width; $endheight2 = $height; if ($this->imageheight imagewidth imagewidth; $endheight = $this->imageheight; //return; } elseif (($this->imageheight * $widthratio)imagewidth * $heightratio); $endheight = $height; } else { $endwidth = $width; $endheight = ceil($this->imageheight * $widthratio); } break; default: $endwidth = $width; $endheight = $height; break; } if ($this->imageresource==null) { $this->createsrcimage(); } if($bgcolor){ $this->newresource = imagecreatetruecolor($width,$height); $bg=imagecolorallocate($this->newresource,$bgcolor[0],$bgcolor[1],$bgcolor[2]); imagefilledrectangle($this->newresource,0,0,$width,$height,$bg); $tox=ceil(($width-$endwidth)/2); $toy=ceil(($height-$endheight)/2); if($toxnewresource = imagecreatetruecolor($endwidth,$endheight); } $this->newrestype = $this->imagetype; imagecopyresampled($this->newresource, $this->imageresource, $tox, $toy, 0, 0, $endwidth, $endheight,$this->imagewidth,$this->imageheight); } /** * 给图像加水印 * @param string $watercontent 水印内容可以是图像文件名，也可以是文字 * @param int $pos 位置0-9可以是数组 * @param int $textfont 字体大字，当水印内容是文字时有效 * @param string $textcolor 文字颜色，当水印内容是文字时有效 * @return string */ public function watermark($watercontent, $pos = 0, $textfont=5, $textcolor=#ffffff) { $iswaterimage = file_exists($watercontent); if ($iswaterimage) { $waterimgres = $this->createimagefromfile($watercontent); $waterimginfo = $this->getimageinfo($watercontent); $waterwidth = $waterimginfo[0]; $waterheight = $waterimginfo[1]; } else { $watertext = $watercontent; //$temp = @imagettfbbox(ceil($textfont*2.5),0,./cour.ttf,$watercontent); if ($temp) { $waterwidth = $temp[2]-$temp[6]; $waterheight = $temp[3]-$temp[7]; } else { $waterwidth = 100; $waterheight = 12; } } if ($this->imageresource==null) { $this->createsrcimage(); } switch($pos) { case 0://随机 $posx = rand(0,($this->imagewidth - $waterwidth)); $posy = rand(0,($this->imageheight - $waterheight)); break; case 1://1为顶端居左 $posx = 0; $posy = 0; break; case 2://2为顶端居中 $posx = ($this->imagewidth - $waterwidth) / 2; $posy = 0; break; case 3://3为顶端居右 $posx = $this->imagewidth - $waterwidth; $posy = 0; break; case 4://4为中部居左 $posx = 0; $posy = ($this->imageheight - $waterheight) / 2; break; case 5://5为中部居中 $posx = ($this->imagewidth - $waterwidth) / 2; $posy = ($this->imageheight - $waterheight) / 2; break; case 6://6为中部居右 $posx = $this->imagewidth - $waterwidth; $posy = ($this->imageheight - $waterheight) / 2; break; case 7://7为底端居左 $posx = 0; $posy = $this->imageheight - $waterheight; break; case 8://8为底端居中 $posx = ($this->imagewidth - $waterwidth) / 2; $posy = $this->imageheight - $waterheight; break; case 9://9为底端居右 $posx = $this->imagewidth - $waterwidth-20; $posy = $this->imageheight - $waterheight-10; break; default://随机 $posx = rand(0,($this->imagewidth - $waterwidth)); $posy = rand(0,($this->imageheight - $waterheight)); break; } imagealphablending($this->imageresource, true); if($iswaterimage) { imagecopy($this->imageresource, $waterimgres, $posx, $posy, 0, 0, $waterwidth,$waterheight); } else { $r = hexdec(substr($textcolor,1,2)); $g = hexdec(substr($textcolor,3,2)); $b = hexdec(substr($textcolor,5)); $textcolor = imagecolorallocate($this->imageresource, $r, $g, $b); imagestring ($this->imageresource, $textfont, $posx, $posy, $watertext, $textcolor); } $this->newresource = $this->imageresource; $this->newrestype = $this->imagetype; } /** * 生成验证码图片 * @param int $width 宽 * @param string $height 高 * @param int $length 长度 * @param int $validtype 0=数字,1=字母,2=数字加字母 * @param string $textcolor 文字颜色 * @param string $backgroundcolor 背景颜色 * @return void */ public function imagevalidate($width, $height, $length = 4, $validtype = 1, $textcolor = '#000000', $backgroundcolor = '#ffffff') { if ($validtype==1) { $validstring = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'; $validlength = 52; } elseif ($validtype==2) { $validstring = '0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'; $validlength = 62; } else { $validstring = '123456789'; $validlength = 9; } srand((int)time()); $valid = ''; for ($i=0; $inewresource = imagecreate($width,$height); $bgr = hexdec(substr($backgroundcolor,1,2)); $bgg = hexdec(substr($backgroundcolor,3,2)); $bgb = hexdec(substr($backgroundcolor,5,2)); $backgroundcolor = imagecolorallocate($this->newresource, $bgr, $bgg, $bgb); $tr = hexdec(substr($textcolor,1,2)); $tg = hexdec(substr($textcolor,3,2)); $tb = hexdec(substr($textcolor,5,2)); $textcolor = imagecolorallocate($this->newresource, $tr, $tg, $tb); for ($i=0;$inewresource,5,$i*$width/$length+3,2, $valid[$i],$textcolor); } $this->newrestype = imagetype_jpeg; return $valid; } /** * 显示输出图像 * @return void */ public function display($filename='', $quality=100) { $imgtype = $this->newrestype; $imagesrc = $this->newresource; switch ($imgtype) { case imagetype_gif: if ($filename=='') { header('content-type: image/gif'); } imagegif($imagesrc, $filename, $quality); break; case imagetype_jpeg: if ($filename=='') { header('content-type: image/jpeg'); } imagejpeg($imagesrc, $filename, $quality); break; case imagetype_png: if ($filename=='') { header('content-type: image/png'); imagepng($imagesrc); } else { imagepng($imagesrc, $filename); } break; case imagetype_wbmp: if ($filename=='') { header('content-type: image/wbmp'); } imagewbmp($imagesrc, $filename, $quality); break; case imagetype_xbm: if ($filename=='') { header('content-type: image/xbm'); } imagexbm($imagesrc, $filename, $quality); break; default: throw new exception('unsupport image type'); } imagedestroy($imagesrc); } /** * 保存图像 * @param int $filenametype 文件名类型 0使用原文件名，1使用指定的文件名，2在原文件名加上后缀，3产生随机文件名 * @param string $folder 文件夹路径 为空为与原文件相同 * @param string $param 参数$filenametype为1时为文件名2时为后缀 * @return void */ public function save($filenametype = 0, $folder = null, $param = '_miniature') { if ($folder==null) { $folder = dirname($this->filename).directory_separator; } $fileextname = filesystem::fileext($this->filename, true); $filebesicname = filesystem::getbasicname($this->filename, false); switch ($filenametype) { case 1: $newfilename = $folder.$param; break; case 2: $newfilename = $folder.$filebesicname.$param.$fileextname; break; case 3: $tmp = date('ymdhis'); $filebesicname = $tmp; $i = 0; while (file_exists($folder.$filebesicname.$fileextname)) { $filebesicname = $tmp.$i; $i++; } $newfilename = $folder.$filebesicname.$fileextname; break; default: $newfilename = $this->filename; break; } $this->display($newfilename); return $newfilename; }}?>
希望本文所述对大家的php程序设计有所帮助。