php - imagecreatefromstring 函数有什么问题？

Question

这段代码有什么问题？

<?php
$data = "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...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";    
$data = base64_decode($data);

$im = imagecreatefromstring($data);
if ($im !== false) {
    header('Content-Type: image/png');
    imagepng($im);
    imagedestroy($im);
}
else {
    echo 'An error occurred.';
}
?>

我收到这些错误:

• 警告:imagecreatefromstring():gd-png:致命的 libpng 错误:读取错误:第 5 行 D:\wamp\www\img\index.php 中的数据被截断

• 警告:imagecreatefromstring():gd-png 错误:setjmp 在第 5 行的 D:\wamp\www\img\index.php 中返回错误条件

• 警告:imagecreatefromstring():第 5 行 D:\wamp\www\img\index.php 中传递的数据不是“PNG”格式

• 警告:imagecreatefromstring():第 5 行无法使用 D:\wamp\www\img\index.php 中的数据创建 GD 图像流

发生错误。

谁能帮帮我？

谢谢。

Answer 1

在您的 base64 编码图像中间有一个 ...。

AAAECBAg...gQIECAAA