如何用PHP实现文件缩略图生成？
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本文共计601个文字，预计阅读时间需要3分钟。
PHP实现文件压缩略图的简单方法：
1.创建PHP示例文件；
2.使用`if`语句检查请求动作和文件大小；
3.从上传中创建文件，并生成压缩略图。代码如下：
php
// 文件名 $filename=$_FILES['file']['name'];
// 保存文件 move_uploaded_file($_FILES['file']['tmp_name'], $uploadPath . $filename);
// 创建压缩略图 $imagePath=$uploadPath . 'thumbnail_' . $filename; createThumbnail($uploadPath . $filename, $imagePath, 100, 100);}
操作环境：Windows 7系统。
php实现文件缩略图的方法：首先创建一个PHP示例文件；然后通过“if ($_REQUEST['action']=="add"){...}if ($userfile_size>102400){...}”方法实现从上传文件创建缩略图即可。
本文操作环境：windows7系统、PHP7.1版，DELL G3电脑
php怎么实现文件缩略图？
php实现从上传文件创建缩略图的方法
本文实例讲述了php实现从上传文件创建缩略图的方法。
具体实现方法如下：
<?php if ($_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>
推荐学习：《PHP视频教程》
以上就是php怎么实现文件缩略图的详细内容，更多请关注自由互联其它相关文章！
本文共计601个文字，预计阅读时间需要3分钟。
PHP实现文件压缩略图的简单方法：
1.创建PHP示例文件；
2.使用`if`语句检查请求动作和文件大小；
3.从上传中创建文件，并生成压缩略图。代码如下：
php
// 文件名 $filename=$_FILES['file']['name'];
// 保存文件 move_uploaded_file($_FILES['file']['tmp_name'], $uploadPath . $filename);
// 创建压缩略图 $imagePath=$uploadPath . 'thumbnail_' . $filename; createThumbnail($uploadPath . $filename, $imagePath, 100, 100);}
操作环境：Windows 7系统。
php实现文件缩略图的方法：首先创建一个PHP示例文件；然后通过“if ($_REQUEST['action']=="add"){...}if ($userfile_size>102400){...}”方法实现从上传文件创建缩略图即可。
本文操作环境：windows7系统、PHP7.1版，DELL G3电脑
php怎么实现文件缩略图？
php实现从上传文件创建缩略图的方法
本文实例讲述了php实现从上传文件创建缩略图的方法。
具体实现方法如下：
<?php if ($_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>
推荐学习：《PHP视频教程》
以上就是php怎么实现文件缩略图的详细内容，更多请关注自由互联其它相关文章！