PHP 中的图像转换
我有一本书，其中有一个从用户提供的随机图片创建全新图片的示例，我认为该示例有问题，至少我不能使用它。浏览器中PHP返回的错误代码：
Fatal error: Uncaught Error: Call to undefined function imagecreatefromstring() in C:\xampp\htdocs\kepkonvertalas.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kepkonvertalas.php on line 13
HTML形式：
<form action="kepkonvertalas.php" method="post" enctype="multipart/form-data">
<input type="file" name="kep"><br>
<input type="submit" value="kuldes">
</form>
PHP部分：
<?php
$fajl = $_FILES['kep']['tmp_name'];
$kep = file_get_contents($fajl);
$forraskep = imagecreatefromstring($kep);
$szelesseg = imageSX($forraskep);
$magassag = imageSY($forraskep);
$ujmagassag = 400;
$ujszelesseg = $ujmagassag*($szelesseg/$magassag);
$ujkep = imagecreatetruecolor($ujszelesseg, $ujmagassag);
$eredmeny = imagecopyresampled($ujkep, $forraskep, 0, 0, 0, 0, $ujszelesseg, $ujmagassag, $szelesseg, $magassag);
imagejpeg($ujkep, "ujkep.jpg");
?>
<img src="ujkep.jpg" alt="">`
可疑的是，这个扩展没有实现到我的php.ini中，但我找不到任何证据对于它，要么解决问题。感谢您的帮助！
我尝试从 URL 实现图片，并对其进行转换，这意味着我删除了
$fajl = $_FILES['kep']['tmp_name'];
$kep = file_get_contents($fajl);`
并且我使用图片 URL 创建了一个变量，然后在 $forraskep = imagecreatefromstring($kep);
我只是这样改变：
$forraskep = imagecreatefromstring(file_get_contents($src);
那么下一个问题是，>$forraskep 变量未定义。
我期望输出具有给定参数大小的图片。
I have a book where is a sample for creating a whole new picture, from a random picture given by the user, and I think there is something wrong in the example, at least I can't use it. The error code gave back by the PHP in the browser:
Fatal error: Uncaught Error: Call to undefined function imagecreatefromstring() in C:\xampp\htdocs\kepkonvertalas.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kepkonvertalas.php on line 13
The HTML form:
<form action="kepkonvertalas.php" method="post" enctype="multipart/form-data">
<input type="file" name="kep"><br>
<input type="submit" value="kuldes">
</form>
The PHP part:
<?php
$fajl = $_FILES['kep']['tmp_name'];
$kep = file_get_contents($fajl);
$forraskep = imagecreatefromstring($kep);
$szelesseg = imageSX($forraskep);
$magassag = imageSY($forraskep);
$ujmagassag = 400;
$ujszelesseg = $ujmagassag*($szelesseg/$magassag);
$ujkep = imagecreatetruecolor($ujszelesseg, $ujmagassag);
$eredmeny = imagecopyresampled($ujkep, $forraskep, 0, 0, 0, 0, $ujszelesseg, $ujmagassag, $szelesseg, $magassag);
imagejpeg($ujkep, "ujkep.jpg");
?>
<img src="ujkep.jpg" alt="">`
What is suspect, is that this extension is not implemented into my php.ini, but I cant find any proof for it, either solve the problem. Thanks for the help!
I tried to implement a picture from an URL, and do the conversion on that, which means I deleted the
$fajl = $_FILES['kep']['tmp_name'];
$kep = file_get_contents($fajl);`
And I've made a variable with a picture URL, and in the$forraskep = imagecreatefromstring($kep);
I just changed like this:
$forraskep = imagecreatefromstring(file_get_contents($src);
Well the next problem was, that the $forraskep variable was not defined.
I expect an output where I have the picture with the size of the given parameters.
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解决方案实际上有点简单：
The solution was actually kinda easy: