更改图像大小 – PHP
作者:互联网
我最近创建了一个上传功能,但我不知道如何将宽度和高度更改为75px …我尝试了一个我通过Google找到的代码,但我得到了这个错误:
( ! ) Fatal error: Class 'Imagick' not found in C:\wamp\www\Legendary\new\usersettings.php on line 725
Call Stack
# Time Memory Function Location
1 0.0042 880616 {main}( ) ..\usersettings.php:0
这是我当前的代码(包括不起作用的代码):
echo '
<table border="0" width="100%">
<tr><td style="font-size: 16px;">Change Image</td></tr>
<form action="" method="post" enctype="multipart/form-data">
<tr><td>Upload Image:</td><td style="text-align: right;"><input type="file" name="upimage" id="upimage" /></td></tr>
<tr><td></td><td style="text-align: right; font-size: 10px;"></td></tr>
<tr><td></td><td style="text-align: right;"><input type="submit" name="submitnewimage" value="Upload" class="button" /></td></tr>
</form>
';
echo '
</table>
';
if(isset($_POST['submitnewimage'])){
$name = $_FILES['upimage']['name'];
$temp = $_FILES['upimage']['tmp_name'];
$type = $_FILES['upimage']['type'];
$size = $_FILES['upimage']['size'];
if($name!=""){
include 'config.php';
$sql5 = mysql_query("SELECT * FROM images ORDER BY id DESC LIMIT 1");
while($row=mysql_fetch_array($sql5)) {
if(!isset($show2)){
$id = $row['id'];
$id = $id + 1;
$show2 = "YES";
}
}
if(($type=="image/jpeg") || ($type=="image/jpg") || ($type=="image/gif") || ($type=="image/pjpeg") || ($type=="image/png")){
if($size<=100000){
$pos = strrpos($name, '.');
if($pos === false)
$ext = "";
$ext = substr($name, $pos);
$newFilename = $id.$ext;
move_uploaded_file($temp, "images/teamicons/".$newFilename);
$im = new Imagick('images/teamicons/'.$newFilename);
$im->thumbnailImage(75,75);
$im->writeImage('images/teamicons/'.$newFilename);
mysql_query("INSERT INTO `images`(`id`, `name`, `size`, `type`) VALUES (NULL,'$newFilename',$size,'$type')");
$myusername = $_SESSION['myusername'];
mysql_query("UPDATE `members` SET `img`= '$newFilename' WHERE `username`='$myusername'");
header("Location:" . $_SESSION['prev_page']);
}else{echo "<tr><td colspan='2'><span style='color:#F00;'>The file, "".$name."", is too large! Maximum allowed file size is 100kB.</span></td></tr>";}
}else{echo "<tr><td colspan='2'><span style='color:#F00;'>"".$type."" is not a valid file type!</span></td></tr>";}
}else{echo "<tr><td colspan='2'><span style='color:#F00;'>No file has been specified!</span></td></tr>";}
}
有没有办法改变图像的宽度和高度?
解决方法:
我最近成功使用了GD,特别是使用了imagecopyresampled函数.
稍微扩展一下…一旦我上传了图像(我不会进入,因为这是另一个问题),我做了一件相当简单的事情:
$original_info = getimagesize($filename);
$original_w = $original_info[0];
$original_h = $original_info[1];
$original_img = imagecreatefromjpg($filename);
$thumb_w = 100;
$thumb_h = 100;
$thumb_img = imagecreatetruecolor($thumb_w, $thumb_h);
imagecopyresampled($thumb_img, $original_img,
0, 0,
0, 0,
$thumb_w, $thumb_h,
$original_w, $original_h);
imagejpeg($thumb_img, $thumb_filename);
imagedestroy($thumb_img);
imagedestroy($original_img);
请注意,我还没有测试过这段代码.这是为了让您对我的方法有一个基本的了解.
标签:php,image-resizing,image-processing 来源: https://codeday.me/bug/20190929/1831579.html