我有上传图片并将其存储在数据库中的代码，但我需要在上传时调整图片大小而不使其变形。我尽量不使用 js，但如果需要，请使用并帮助我。
这是我的文件add_post.php:
<?php //include config
require_once('../includes/config.php');
//if not logged in redirect to login page
if(!$user->is_logged_in()){ header('Location: ../login.php'); }
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Admin - Add Post</title>
<link rel="stylesheet" href="../style/normalize.css">
<link rel="stylesheet" href=".style/style.css">
<script src="//tinymce.cachefly.net/4.0/tinymce.min.js"></script>
<script>
tinymce.init({
selector: "textarea",
plugins: [
"advlist autolink lists link image charmap print preview anchor",
"searchreplace visualblocks code fullscreen",
"insertdatetime media table contextmenu paste"
],
toolbar: "insertfile undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image"
});
</script>
</head>
<body>
<?php include('template/menu.php');?>
<div id="wrapper">
<p><a href="./">Blog Admin Index</a></p>
<h2>Add Post</h2>
<?php
//if form has been submitted process it
if(isset($_POST['submit'])){
$_POST = array_map( 'stripslashes', $_POST );
$file = rand(1000,100000)."-".$_FILES['file']['name'];
$file_loc = $_FILES['file']['tmp_name'];
$folder="../images/articole/";
$new_file_name = strtolower($file);
$final_file=str_replace(' ','-',$new_file_name);
//collect form data
extract($_POST);
extract($_FILES);
//very basic validation
if($postTitle ==''){
$error[] = 'Please enter the title.';
}
if($postDesc ==''){
$error[] = 'Please enter the description.';
}
if($postCont ==''){
$error[] = 'Please enter the content.';
}
if(move_uploaded_file($file_loc,$folder.$final_file)) {
if(!isset($error)){
try {
//insert into database
$stmt = $db->prepare('INSERT INTO blog_posts (postTitle,postDesc,postCont,postImage,postDate) VALUES (:postTitle, :postDesc, :postCont, :final_file, :postDate)') ;
$stmt->execute(array(
':postTitle' => $postTitle,
':postDesc' => $postDesc,
':postCont' => $postCont,
':final_file' => $final_file,
':postDate' => date('Y-m-d H:i:s')
));
//redirect to index page
header('Location: index.php?action=added');
exit;
} catch(PDOException $e) {
echo $e->getMessage();
}
}
}
}
//check for any errors
if(isset($error)){
foreach($error as $error){
echo '<p class="error">'.$error.'</p>';
}
}
?>
<form action='' method='post' enctype="multipart/form-data">
<p><label>Title</label><br />
<input type='text' name='postTitle' value='<?php if(isset($error)){ echo $_POST['postTitle'];}?>'></p>
<p><label>Description</label><br />
<textarea name='postDesc' cols='60' rows='10'><?php if(isset($error)){ echo $_POST['postDesc'];}?></textarea></p>
<p><label>Content</label><br />
<textarea name='postCont' cols='60' rows='10'><?php if(isset($error)){ echo $_POST['postCont'];}?></textarea></p>
<p><label>Image</label><br />
<input type="file" name="file" />
<p><input type='submit' name='submit' value='Submit'></p>
</form>
</div>最佳答案
假设 $tmp 是你上传的文件
首先，我建议您检查上传图片的有效性。 取消注释 Exif和 php 扩展(在你的 php.ini 中，然后重新启动) 检查图像 mime 类型。
用 GD php extension 尝试同样的事情(不包含在 php 中) 以前检测到的 mime 类型，可以为您提供使用适当的扩展功能来调整大小。 与 GD.
最后计算调整大小的良好保留比率。
if(move_uploaded_file($file_loc,$folder.$final_file))
{
$tmp = $folder.$final_file;
$type = exif_imagetype($tmp);
switch($type)
{
case IMAGETYPE_PNG: $orig = imagecreatefrompng($tmp); break;
case IMAGETYPE_JPEG: $orig = imagecreatefromjpeg($tmp); break;
case IMAGETYPE_GIF: $orig = imagecreatefromgif($tmp); break;
}
//trying to get original size, if not, it's not valid image (cf. security)
$size = getimagesize($tmp);
if(is_bool($size))
return false;
$w = "800"; // this is your ratio fixer;
$reduce = (($w * 100)/$size[0]);
$h = (($size[1] * $reduce)/100);
$new = imagecreatetruecolor($w, $h);
imagecopyresampled($new , $orig, 0, 0, 0, 0, $w, $h, $size[0],$size[1]);
// save resized
imagepng($new, $tmp);
if(!isset($error))
{
try
{
这是一个自制的脚本，但是: 也可以找ImageMagick php ext，更强大。
关于php - 使用 php 和 mysql 上传图像并调整大小而不变形图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34418848/