php图片上传并生成缩略图效果
本教程是一款php图片上传然后,把上传的图片生成小图片,是一款非常好的文件上传类,如果你正在找类程序可以进来看看.
php图片上传并生成缩略图,实例代码如下:
<?php function uploadimage($upname, $smallmark = 1, $dstsw, $dstsh = 0, $path_dim, $path_xim, $newname, $smallname = 0, $filetype = "null") { global $webaddr, $_files, $my; $phpv = str_replace('.', '', php_version); $filename = $upname; $max_file_size = 2147483648; //上传文件大小限制, 单位byte 2m $path_im = $path_dim; //生成大图保存文件夹路径 $path_sim = $path_xim; //缩略图保存文件夹路径 $simclearly = 75; $simclearlypng = $phpv >= 512 ? 7 : 75; //缩略图清晰度0-100,数字越大越清晰,文件尺寸越大 $smallmark = $smallmark; //是否生成缩略图(1为加生成,其他为不); $dst_sw = $dstsw; //定义缩略图宽度,高度我采用等比例缩放,所以只要比较宽度就可以了 $uptypes = array( 'image/jpg', 'image/jpeg', 'image/png', 'image/pjpeg', 'image/gif', 'image/bmp', 'image/x-png' ); if (!is_uploaded_file($_files[$filename][tmp_name])) { dsetcookie('setok', 'upload1'); header("location:111cn.net/profile"); exit; } $file = $_files[$filename]; $pinfo = pathinfo($file["name"]); if ($filetype == "null") { $filetype = $pinfo['extension']; } if (!in_array(strtolower($pinfo['extension']) , array( "jpg", "jpeg", "png", "gif" ))) { dsetcookie('setok', 'upload3'); header("location:111cn.net/profile"); exit; } if ($max_file_size < $file["size"]) { //检查文件大小 dsetcookie('setok', 'upload2'); header("location:111cn.net/profile"); exit; } if (!in_array($file["type"], $uptypes)) { //检查文件类型 dsetcookie('setok', 'upload3'); header("location:111cn.net/profile"); exit; } if (!file_exists($path_im)) { mkdir($path_im); } $filename = $file["tmp_name"]; $im_size = getimagesize($filename); $src_w = $im_size[0]; $src_h = $im_size[1]; $src_type = $im_size[2]; $all_path = $path_im . $newname . "." . $filetype; //路径+文件名,目前以上传时间命名 if (file_exists($all_path)) { @unlink($all_path); } if (!move_uploaded_file($filename, $all_path)) { dsetcookie('setok', 'upload4'); header("location:111cn.net/profile"); exit; } $pinfo = pathinfo($all_path); $fname = $pinfo[basename]; switch ($src_type) { //判断源图片文件类型 case 1: //gif $src_im = @imagecreatefromgif($all_path); //从源图片文件取得图像 break; case 2: //jpg $src_im = @imagecreatefromjpeg($all_path); break; case 3: //png $src_im = @imagecreatefrompng($all_path); break; //case 6: //$src_im=imagecreatefromwbmp($all_path); //break; default: dsetcookie('setok', 'upload3'); header("location:111cn.net/profile"); exit; } if ($smallmark == 1) { if (!file_exists($path_sim)) { //检查缩略图目录是否存在,不存在创建 mkdir($path_sim); } if ($smallname) $newname = $smallname; $sall_path = $path_sim . $newname . "." . $filetype; if (file_exists($sall_path)) { @unlink($sall_path); } if ($src_w <= $dst_sw) { // 原图尺寸 <= 缩略图尺寸 if ($dstsh == 0) { $dst_sim = @imagecreatetruecolor($src_w, $src_h); //新建缩略图真彩位图 $sx = $sy = 0; } else { $dst_sim = @imagecreatetruecolor($dstsw, $dstsh); //新建缩略图真彩位图 $sx = ($dstsw - $src_w) / 2; $sy = ($dstsh - $src_h) / 2; } $img = @imagecreatefrompng("images/phbg.png"); @imagecopymerge($dst_sim, $img, 0, 0, 0, 0, $dstsw, $dstsh, 100); //原图图像写入新建真彩位图中 @imagecopymerge($dst_sim, $src_im, $sx, $sy, 0, 0, $src_w, $src_h, 100); //原图图像写入新建真彩位图中 } if ($src_w > $dst_sw) { // 原图尺寸 > 缩略图尺寸 $dst_sh = $dst_sw / $src_w * $src_h; if ($dst_sh < $dstsh) { $dst_sh = $dstsh; $dst_sw = $dst_sh / $src_h * $src_w; } if ($dstsh == 0) { $dst_sim = @imagecreatetruecolor($dst_sw, $dst_sh); //新建缩略图真彩位图(等比例缩小原图尺寸) } else { $dst_sim = @imagecreatetruecolor($dstsw, $dstsh); //新建缩略图真彩位图(等比例缩小原图尺寸) } @imagecopyresampled($dst_sim, $src_im, 0, 0, 0, 0, $dst_sw, $dst_sh, $src_w, $src_h); //原图图像写入新建真彩位图中 } switch ($src_type) { case 1: @imagegif($dst_sim, $sall_path, $simclearly); //生成gif文件,图片清晰度0-100 break; case 2: @imagejpeg($dst_sim, $sall_path, $simclearly); //生成jpg文件,图片清晰度0-100 break; case 3: @imagepng($dst_sim, $sall_path, $simclearlypng); //生成png文件,图片清晰度0-100 break; //case 6: //imagewbmp($dst_sim,$sall_path); break; } //开源代码phprm.com //释放缓存 @imagedestroy($dst_sim); } @imagedestroy($src_im); return $newname . "." . $filetype; }
教程链接:http://www.phprm.com/tuxiang/fs4464.html
随意转载~但请保留教程地址★