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本篇內(nèi)容主要講解“php如何實現(xiàn)文件縮略圖”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實用性強。下面就讓小編來帶大家學(xué)習(xí)“php如何實現(xiàn)文件縮略圖”吧!
php實現(xiàn)文件縮略圖的方法:首先創(chuàng)建一個PHP示例文件;然后通過“if ($_REQUEST['action']=="add"){...}if ($userfile_size>102400){...}”方法實現(xiàn)從上傳文件創(chuàng)建縮略圖即可。
本文操作環(huán)境:windows7系統(tǒng)、PHP7.1版,DELL G3電腦
php怎么實現(xiàn)文件縮略圖?
php實現(xiàn)從上傳文件創(chuàng)建縮略圖的方法
本文實例講述了php實現(xiàn)從上傳文件創(chuàng)建縮略圖的方法。
具體實現(xiàn)方法如下:
<?php if ($_REQUEST['action']=="add"){ $userfile = $HTTP_POST_FILES['photo']['tmp_name']; $userfile_name = $HTTP_POST_FILES['photo']['name']; $userfile_size = $HTTP_POST_FILES['photo']['size']; $userfile_type = $HTTP_POST_FILES['photo']['type']; ///////////////////////// //GET-DECLARE DIMENSIONS // $dimension = getimagesize($userfile); $large_width = $dimension[0]; // GET PHOTO WIDTH $large_height = $dimension[1]; //GET PHOTO HEIGHT $small_width = 120; // DECLARE THUMB WIDTH $small_height = 90; // DECLARE THUMB HEIGHT ///////////////////////// //CHECK SIZE // if ($userfile_size>102400){ $error=1; $msg = "The photo is over 100kb. Please try again."; } //////////////////////////////// // CHECK TYPE (IE AND OTHERS) // if ($userfile_type="image/pjpeg"){ if ($userfile_type!="image/jpeg"){ $error=1; $msg = "The photo must be JPG"; } } ////////////////////////////// //CHECK WIDTH/HEIGHT // if ($large_width!=600 or$large_height!=400){ $error=1; $msg = "The photo must be 600x400 pixels"; } /////////////////////////////////////////// //CREATE THUMB / UPLOAD THUMB AND PHOTO /// if ($error<>1){ $image = $userfile_name; //if you want to insert it to the database $pic = imagecreatefromjpeg($userfile); $small = imagecreatetruecolor($small_width,$small_height); imagecopyresampled($small,$pic,0,0,0,0, $small_width, $small_height, $large_width, $large_height); if (imagejpeg($small,"path/to/folder/to/upload/thumb".$userfile_name, 100)){ $large = imagecreatetruecolor($large_width,$large_height); imagecopyresampled($large,$pic,0,0,0,0, $large_width, $large_height, $large_width, $large_height); if (imagejpeg($large,"path/to/folder/to/upload/photo".$userfile_name, 100)) {} else {$msg="A problem has occured. Please try again."; $error=1;} } else { $msg="A problem has occured. Please try again."; $error=1; } } ////////////////////////////////////////////// /// If everything went right a photo (600x400) and /// a thumb(120x90) were uploaded to the given folders } ?> <html><head><title>create thumb</title></head> <body> <form name="form1" enctype="multipart/form-data" action="thisfile.php?action=add" method="post"> Select Photo: <input type="file" name="photo"> <input type="submit" name="submit" value="CREATE THUMB AND UPLOAD"> </form> </body </html>
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