php缩略图生成程序
一直想在网上找个图片所略图程序,但是一直没有找到无变形的,一般都是对原图进行简单的缩放,我想也许已经有了,只是我没有找到,所以没办法自己写了一个,其实也不是全是自己写的,只是在已有的基础上改的.
版权说明:该版本是在"IEB_UPLOAD CLASS Ver 1.1"的基础上二次开发的,原程序对图片的裁剪将使图片变形、失真！本人在该程序的基础上进行了更改,用数据参数与原图片文件参数(主要是指宽和高)进行对比,得出比例值,先生成与原图片同比例缩放的图片,然后再以该中间图中心开始截取,从而获得缩略图,当然,图片会被裁剪,但是是最小限度的裁剪.
//photo_file 表单文件域名称，不要加$； ./up_img，上传位置
$upfos = new ieb_upload('photo_file','./up_img');
$old_file_name=$upfos -> getName();
$old_file_fooder=$upfos -> getExt();
$file_size=$upfos -> getSize();
$file_name=$upfos -> newName();
$upfos -> upload($file_name);
$upfos -> thumb("small_",125,120);
$new_file_name=$upfos -> UpFile(); $new_file_name 上传后大图名
$small_file_name="small_".$new_file_name; $small_file_name 略图名php缩略图生成程序源码如下:
<?php
//程序设计:swin.wang Email: php_in_china@yahoo.com.cn QQ:592298893
//该程序你可无限制使用,但请保留版权信息.
class ieb_upload {
var $FormName; //文件域名称
var $Directroy; //上传至目录
var $MaxSize; //最大上传大小
var $CanUpload; //是否可以上传
var $doUpFile; //上传的文件名
var $sm_File; //缩略图名称
var $Error; //错误参数
function ieb_upload($formName = '', $dirPath = '', $maxSize = 2097152) //(1024*2)*1024=2097152 就是 2M
{
global $FormName, $Directroy, $MaxSize, $CanUpload, $Error, $doUpFile, $sm_File;
//初始化各种参数
$FormName = $formName;
$MaxSize = $maxSize;
$CanUpload = true;
$doUpFile = '';
$sm_File = '';
$Error = 0;
if ($formName == '') {
$CanUpload = false;
$Error = 1;
break;
}
if ($dirPath == '') {
$Directroy = $dirPath;
} else {
$Directroy = $dirPath . '/';
}
}
//检查文件是否存在
function scanFile() {
global $FormName, $Error, $CanUpload;
if ($CanUpload) {
$scan = is_readable($_FILES[$FormName]['name']);
if ($scan) {
$Error = 2;
}
return $scan;
}
}
//获取文件大小
function getSize($format = 'B') {
global $FormName, $Error, $CanUpload;
if ($CanUpload) {
if ($_FILES[$FormName]['size'] == 0) {
$Error = 3;
$CanUpload = false;
}
switch ($format) {
case 'B':
return $_FILES[$FormName]['size'];
break;
case 'M':
return ($_FILES[$FormName]['size']) / (1024 * 1024);
}
}
}
//获取文件类型
function getExt() {
global $FormName, $Error, $CanUpload;
if ($CanUpload) {
$ext = $_FILES[$FormName]['name'];
$extStr = explode('.', $ext);
$count = count($extStr) - 1;
}
return $extStr[$count];
}
//获取文件名称
function getName() {
global $FormName, $CanUpload;
if ($CanUpload) {
return $_FILES[$FormName]['name'];
}
}
//新建文件名
function newName() {
global $CanUpload, $FormName;
if ($CanUpload) {
$FullName = $_FILES[$FormName]['name'];
$extStr = explode('.', $FullName);
$count = count($extStr) - 1;
$ext = $extStr[$count];
return date('YmdHis') . rand(0, 9) . '.' . $ext;
}
}
//上传文件
function upload($fileName = '') {
global $FormName, $Directroy, $CanUpload, $Error, $doUpFile;
if ($CanUpload) {
if ($_FILES[$FormName]['size'] == 0) {
$Error = 3;
$CanUpload = false;
return $Error;
break;
}
}
if ($CanUpload) {
if ($fileName == '') {
$fileName = $_FILES[$FormName]['name'];
}
$doUpload = @copy($_FILES[$FormName]['tmp_name'], $Directroy . $fileName);
if ($doUpload) {
$doUpFile = $fileName;
chmod($Directroy . $fileName, 0777);
return true;
} else {
$Error = 4;
return $Error;
}
}
}
//创建图片缩略图
function thumb($dscChar = '', $width = 160, $height = 120) {
global $CanUpload, $Error, $Directroy, $doUpFile, $sm_File;
if ($CanUpload && $doUpFile != '') {
$srcFile = $doUpFile;
if ($dscChar == '') {
$dscChar = 'sm_';
}
$dscFile = $Directroy . $dscChar . $srcFile;
$data = getimagesize($Directroy . $srcFile, &$info);
switch ($data[2]) {
case 1:
$im = @imagecreatefromgif($Directroy . $srcFile);
break;
case 2:
$im = @imagecreatefromjpeg($Directroy . $srcFile);
break;
case 3:
$im = @imagecreatefrompng($Directroy . $srcFile);
break;
}
$srcW = imagesx($im);
$srcH = imagesy($im);
if (($srcW / $width) >= ($srcH / $height)) {
$temp_height = $height;
$temp_width = $srcW / ($srcH / $height);
$src_X = abs(($width - $temp_width) / 2);
$src_Y = 0;
} else {
$temp_width = $width;
$temp_height = $srcH / ($srcW / $width);
$src_X = 0;
$src_Y = abs(($height - $temp_height) / 2);
}
$temp_img = imagecreatetruecolor($temp_width, $temp_height);
imagecopyresized($temp_img, $im, 0, 0, 0, 0, $temp_width, $temp_height, $srcW, $srcH);
$ni = imagecreatetruecolor($width, $height);
imagecopyresized($ni, $temp_img, 0, 0, $src_X, $src_Y, $width, $height, $width, $height);
$cr = imagejpeg($ni, $dscFile);
chmod($dscFile, 0777);
if ($cr) {
$sm_File = $dscFile;
return true;
} else {
$Error = 5;
return $Error;
}
}
}
//显示错误参数
function Err() {
global $Error;
return $Error;
}
//上传后的文件名
function UpFile() {
global $doUpFile, $Error;
if ($doUpFile != '') {
return $doUpFile;
} else {
$Error = 6;
}
}
//上传文件的路径
function filePath() {
global $Directroy, $doUpFile, $Error;
if ($doUpFile != '') {
return $Directroy . $doUpFile;
} else {
$Error = 6;
}
}
//缩略图文件名称
function thumbMap() {
global $sm_File, $Error;
if ($sm_File != '') {
return $sm_File;
} else {
$Error = 6;
}
}
//显示版本信息
function ieb_version() {
return 'swin img class Ver 0.1';
}
}本文链接:http://www.phprm.com/tuxiang/fs4511.html
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