《PHP實戰：php可生成縮略圖的文件上傳類實例》要點：
本文介紹了PHP實戰：php可生成縮略圖的文件上傳類實例，希望對您有用。如果有疑問，可以聯系我們。
本文實例講述了php可生成縮略圖的文件上傳類及其用法.分享給大家供大家參考.具體實現辦法如下：PHP教程
類文件調用辦法如下：PHP教程
代碼如下:
<?php
if ($_GET['action'] == 'save') {????????
???????
??? $up = new upload();????????
??? $up->set_dir(dirname(__FILE__).'/upload/','{y}/{m}');????????
??? $up->set_thumb(100,80);????????
??? $up->set_watermark(dirname(__FILE__).'/jblog/images/watermark.png',6,90);????????
??? $fs = $up->execute();????????
???????
??? var_dump($fs);????????
}?????
?>
<html>????????
??? <head><title>test</title></head>????????
??? <body style="margin:0;padding:0">????????
??? <form name="upload" method="post" action="?action=save" enctype="multipart/form-data" style="margin:0">????????
??????? <input type="file" name="attach[]" />????????
??????? <input type="file" name="attach[]" />????????
??????? <input type="submit" name="submit" value="上 傳" />????????
??? </form>????????
??? </body>????????
</html>
upload上傳類文件如下：
代碼如下:
class upload {
??? var $dir;??????????? //附件存放物理目錄????????
??? var $time;?????????? //自定義文件上傳時間????????
??? var $allow_types;??? //允許上傳附件類型????????
??? var $field;????????? //上傳控件名稱????????
??? var $maxsize;??????? //最大允許文件大小,單位為KB????????
???????
??? var $thumb_width;??? //縮略圖寬度????????
??? var $thumb_height;?? //縮略圖高度????????
???????
??? var $watermark_file; //水印圖片地址????????
??? var $watermark_pos;? //水印位置????????
??? var $watermark_trans;//水印透明度?????????
????????
??? //構造函數????????
??? //$types : 允許上傳的文件類型 , $maxsize : 允許大小 ,? $field : 上傳控件名稱 , $time : 自定義上傳時間????????
??? function upload($types = 'jpg|png', $maxsize = 1024, $field = 'attach', $time = '') {????????
??????? $this->allow_types = explode('|',$types);????????
??????? $this->maxsize = $maxsize * 1024;????????
??????? $this->field = $field;????????
??????? $this->time = $time ? $time : time();????????
??? }????????
???????
??? //設置并創建文件具體存放的目錄????????
??? //$basedir? : 基目錄,必須為物理路徑????????
??? //$filedir? : 自定義子目錄,可用參數{y}、{m}、7la94w5njlq9????????
??? function set_dir($basedir,$filedir = '') {????????
??????? $dir = $basedir;????????
??????? !is_dir($dir) && @mkdir($dir,0777);????????
??????? if (!emptyempty($filedir)) {????????
??????????? $filedir = str_replace(array('{y}','{m}','7la94w5njlq9'),array(date('Y',$this->time),date('m',$this->time),date('d',$this->time)),strtolower($filedir));????????
??????????? $dirs = explode('/',$filedir);????????
??????????? foreach ($dirs as $d) {????????
??????????????? !emptyempty($d) && $dir .= $d.'/';????????
??????????????? !is_dir($dir) && @mkdir($dir,0777);????????
??????????? }????????
??????? }????????
??????? $this->dir = $dir;????????
??? }????????
???????
??? //圖片縮略圖設置,如果不生成縮略圖則不用設置????????
??? //$width : 縮略圖寬度 , $height : 縮略圖高度????????
??? function set_thumb ($width = 0, $height = 0) {????????
??????? $this->thumb_width? = $width;????????
??????? $this->thumb_height = $height;????????
??? }????????
???????
??? //圖片水印設置,如果不生成添加水印則不用設置????????
??? //$file : 水印圖片 , $pos : 水印位置 , $trans : 水印透明度????????
??? function set_watermark ($file, $pos = 6, $trans = 80) {????????
??????? $this->watermark_file? = $file;????????
??????? $this->watermark_pos?? = $pos;????????
??????? $this->watermark_trans = $trans;????????
??? }????????
???????
??? /*----------------------------------------------------------------??????
??? 執行文件上傳,處理完返回一個包含上傳成功或失敗的文件信息數組,??????
??? 其中：name 為文件名,上傳成功時是上傳到服務器上的文件名,上傳失敗則是本地的文件名??????
????????? dir? 為服務器上存放該附件的物理路徑,上傳失敗不存在該值??????
????????? size 為附件大小,上傳失敗不存在該值??????
????????? flag 為狀態標識,1表示成功,-1表示文件類型不允許,-2表示文件大小超出??????
??? -----------------------------------------------------------------*/???????
??? function execute() {????????
??????? $files = array(); //成功上傳的文件信息????????
??????? $field = $this->field;????????
??????? $keys = array_keys($_FILES[$field]['name']);????????
??????? foreach ($keys as $key) {????????
??????????? if (!$_FILES[$field]['name'][$key]) continue;????????
????????????????????
??????????? $fileext = $this->fileext($_FILES[$field]['name'][$key]); //獲取文件擴展名????????
??????????? $filename = date('Ymdhis',$this->time).mt_rand(10,99).'.'.$fileext; //生成文件名????????
??????????? $filedir = $this->dir;? //附件實際存放目錄????????
??????????? $filesize = $_FILES[$field]['size'][$key]; //文件大小
????????????????????
??????????? //文件類型不允許????????
??????????? if (!in_array($fileext,$this->allow_types)) {????????
??????????????? $files[$key]['name'] = $_FILES[$field]['name'][$key];????????
??????????????? $files[$key]['flag'] = -1;????????
??????????????? continue;????????
??????????? }????????
???????
??????????? //文件大小超出????????
??????????? if ($filesize > $this->maxsize) {????????
??????????????? $files[$key]['name'] = $_FILES[$field]['name'][$key];????????
??????????????? $files[$key]['name'] = $filesize;????????
??????????????? $files[$key]['flag'] = -2;????????
??????????????? continue;????????
??????????? }????????
???????
??????????? $files[$key]['name'] = $filename;????????
??????????? $files[$key]['dir'] = $filedir;????????
??????????? $files[$key]['size'] = $filesize;????????
???????
??????????? //保存上傳文件并刪除臨時文件????????
??????????? if (is_uploaded_file($_FILES[$field]['tmp_name'][$key])) {????????
??????????????? move_uploaded_file($_FILES[$field]['tmp_name'][$key],$filedir.$filename);????????
??????????????? @unlink($_FILES[$field]['tmp_name'][$key]);????????
??????????????? $files[$key]['flag'] = 1;????????
???????
??????????????? //對圖片進行加水印和生成縮略圖????????
??????????????? if (in_array($fileext,array('jpg','png'))) {????????
??????????????????? if ($this->thumb_width) {????????
??????????????????????? if ($this->create_thumb($filedir.$filename,$filedir.'thumb_'.$filename)) {????????
??????????????????????????? $files[$key]['thumb'] = 'thumb_'.$filename;? //縮略圖文件名????????
??????????????????????? }????????
??????????????????? }????????
??????????????????? $this->create_watermark($filedir.$filename);????????
??????????????? }????????
??????????? }????????
??????? }????????
???????
??????? return $files;????????
??? }????????
???????
??? //創建縮略圖,以相同的擴展名生成縮略圖????????
??? //$src_file : 來源圖像路徑 , $thumb_file : 縮略圖路徑????????
??? function create_thumb ($src_file,$thumb_file) {????????
??????? $t_width? = $this->thumb_width;????????
??????? $t_height = $this->thumb_height;????????
???????
??????? if (!file_exists($src_file)) return false;????????
???????
??????? $src_info = getImageSize($src_file);????????
???????
??????? //如果來源圖像小于或等于縮略圖則拷貝源圖像作為縮略圖????????
??????? if ($src_info[0] <= $t_width && $src_info[1] <= $t_height) {????????
??????????? if (!copy($src_file,$thumb_file)) {????????
??????????????? return false;????????
??????????? }????????
??????????? return true;????????
??????? }????????
???????
??????? //按比例計算縮略圖大小????????
??????? if ($src_info[0] - $t_width > $src_info[1] - $t_height) {????????
??????????? $t_height = ($t_width / $src_info[0]) * $src_info[1];????????
??????? } else {????????
??????????? $t_width = ($t_height / $src_info[1]) * $src_info[0];????????
??????? }????????
???????
??????? //取得文件擴展名????????
??????? $fileext = $this->fileext($src_file);????????
???????
??????? switch ($fileext) {????????
??????????? case 'jpg' :????????
??????????????? $src_img = ImageCreateFromJPEG($src_file); break;????????
??????????? case 'png' :????????
??????????????? $src_img = ImageCreateFromPNG($src_file); break;????????
??????????? case 'gif' :????????
??????????????? $src_img = ImageCreateFromGIF($src_file); break;????????
??????? }????????
???????
??????? //創建一個真彩色的縮略圖像????????
??????? $thumb_img = @ImageCreateTrueColor($t_width,$t_height);????????
???????
??????? //ImageCopyResampled函數拷貝的圖像平滑度較好,優先考慮????????
??????? if (function_exists('imagecopyresampled')) {????????
??????????? @ImageCopyResampled($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);????????
??????? } else {????????
??????????? @ImageCopyResized($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);????????
??????? }????????
???????
??????? //生成縮略圖????????
??????? switch ($fileext) {????????
??????????? case 'jpg' :????????
??????????????? ImageJPEG($thumb_img,$thumb_file); break;????????
??????????? case 'gif' :????????
??????????????? ImageGIF($thumb_img,$thumb_file); break;????????
??????????? case 'png' :????????
??????????????? ImagePNG($thumb_img,$thumb_file); break;????????
??????? }????????
???????
??????? //銷毀臨時圖像????????
??????? @ImageDestroy($src_img);????????
??????? @ImageDestroy($thumb_img);????????
???????
??????? return true;????????
???????
??? }????????
???????
??? //為圖片添加水印????????
??? //$file : 要添加水印的文件????????
??? function create_watermark ($file) {????????
???????
??????? //文件不存在則返回????????
??????? if (!file_exists($this->watermark_file) || !file_exists($file)) return;????????
??????? if (!function_exists('getImageSize')) return;????????
????????????????
??????? //檢查GD支持的文件類型????????
??????? $gd_allow_types = array();????????
??????? if (function_exists('ImageCreateFromGIF')) $gd_allow_types['image/gif'] = 'ImageCreateFromGIF';????????
??????? if (function_exists('ImageCreateFromPNG')) $gd_allow_types['image/png'] = 'ImageCreateFromPNG';????????
??????? if (function_exists('ImageCreateFromJPEG')) $gd_allow_types['image/jpeg'] = 'ImageCreateFromJPEG';????????
???????
??????? //獲取文件信息????????
??????? $fileinfo = getImageSize($file);????????
??????? $wminfo?? = getImageSize($this->watermark_file);????????
???????
??????? if ($fileinfo[0] < $wminfo[0] || $fileinfo[1] < $wminfo[1]) return;????????
???????
??????? if (array_key_exists($fileinfo['mime'],$gd_allow_types)) {????????
??????????? if (array_key_exists($wminfo['mime'],$gd_allow_types)) {????????
????????????????????????
??????????????? //從文件創建圖像????????
??????????????? $temp = $gd_allow_types[$fileinfo['mime']]($file);????????
??????????????? $temp_wm = $gd_allow_types[$wminfo['mime']]($this->watermark_file);????????
???????
??????????????? //水印位置????????
??????????????? switch ($this->watermark_pos) {?????????????????????
??????????????????? case 1 :? //頂部居左????????
??????????????????????? $dst_x = 0; $dst_y = 0; break;??????????????????????
??????????????????? case 2 :? //頂部居中????????
??????????????????????? $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = 0; break;????????????????????????
??????????????????? case 3 :? //頂部居右????????
??????????????????????? $dst_x = $fileinfo[0]; $dst_y = 0; break;???????????????????????
??????????????????? case 4 :? //底部居左????????
??????????????????????? $dst_x = 0; $dst_y = $fileinfo[1]; break;???????????????????????
??????????????????? case 5 :? //底部居中????????
??????????????????????? $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = $fileinfo[1]; break;?????????????
??????????????????? case 6 :? //底部居右????????
??????????????????????? $dst_x = $fileinfo[0]-$wminfo[0]; $dst_y = $fileinfo[1]-$wminfo[1]; break;????????
??????????????????? default : //隨機????????
??????????????????????? $dst_x = mt_rand(0,$fileinfo[0]-$wminfo[0]); $dst_y = mt_rand(0,$fileinfo[1]-$wminfo[1]);????????
??????????????? }????????
???????
??????????????? if (function_exists('ImageAlphaBlending')) ImageAlphaBlending($temp_wm,True); //設定圖像的混色模式????????
??????????????? if (function_exists('ImageSaveAlpha')) ImageSaveAlpha($temp_wm,True); //保存完整的 alpha 通道信息????????
???????
??????????????? //為圖像添加水印????????
??????????????? if (function_exists('imageCopyMerge')) {????????
??????????????????? ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1],$this->watermark_trans);????????
??????????????? } else {????????
??????????????????? ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1]);????????
??????????????? }????????
???????
??????????????? //保存圖片????????
??????????????? switch ($fileinfo['mime']) {????????
??????????????????? case 'image/jpeg' :????????
??????????????????????? @imageJPEG($temp,$file);????????
??????????????????????? break;????????
??????????????????? case 'image/png' :????????
??????????????????????? @imagePNG($temp,$file);????????
??????????????????????? break;????????
??????????????????? case 'image/gif' :?????????
??????????????????????? @imageGIF($temp,$file);????????
??????????????????????? break;????????
??????????????? }????????
??????????????? //銷毀零時圖像????????
??????????????? @imageDestroy($temp);????????
??????????????? @imageDestroy($temp_wm);????????
??????????? }????????
??????? }????????
??? }????????
???????
??? //獲取文件擴展名????????
??? function fileext($filename) {????????
??????? return strtolower(substr(strrchr($filename,'.'),1,10));????????
??? }????????
}
希望本文所述對大家的PHP程序設計有所贊助.PHP教程
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