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★