Question

我有PHP脚本从canvas的base 64字符串创建PNG图像，我需要弄清楚如何使用它，这个新的PHP脚本不会创建调整大小的PNG文件。

参考：

CanvasPic = Base64字符串

使用PHP脚本但没有调整大小。

<?php
if (!file_exists('userCanvas/'))
{
    mkdir('userCanvas', 0755, true);
}
else
{
    $name = $_POST['name'];
    $img = $_POST['CanvasPic'];
    define('UPLOAD_DIR', 'userCanvas/');

    $img = str_replace('data:image/png;base64,', '', $img);
    $img = str_replace(' ', '+', $img);

    $data = base64_decode($img);
    $file = UPLOAD_DIR . uniqid() . '.png';

    $success = file_put_contents($file, $data);
    print $success ? $file : 'Could not save the file!';
}
?>

新脚本但不会创建调整大小的PNG图像：

<?php
if (!file_exists('userCanvas/'))
{
    mkdir('userCanvas', 0755, true);
}
else
{
    $name = $_POST['name'];
    $img = $_POST['CanvasPic'];
    define('UPLOAD_DIR', 'userCanvas/');

    $img = str_replace('data:image/png;base64,', '', $img);
    $img = str_replace(' ', '+', $img);

    $data = base64_decode($img);
    $file = UPLOAD_DIR . uniqid() . '.png';

    $width = 350;
    $height = 250;

    header('Content-Type: image/png');
    list($width_orig, $height_orig) = getimagesize($file);

    $ratio_orig = $width_orig/$height_orig;

    if ($width/$height > $ratio_orig)
    {
        $width = $height*$ratio_orig;
    }
    else
    {
        $height = $width/$ratio_orig;
    }

    $image_p = imagecreatetruecolor($width, $height);
    $image = imagecreatefrompng($file);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
    $success = file_put_contents($image_p, $data);
    print $success ? $image_p : 'Could not save the file!';
}
?>

编辑：我发现错误（跳过行号和网址），我不知道如何解决这些错误。

我发现错误，（跳过的网址和代码行）：

PHP Warning: getimagesize(userCanvas/53bc7c926a606.png): failed to open stream: No such file or directory
PHP Warning: Division by zero in 
PHP Warning: imagecreatetruecolor(): Invalid image dimensions
PHP Warning: imagecreatefrompng(userCanvas/53bc7c926a606.png): failed to open stream: No such file or directory
PHP Warning: imagecopyresampled() expects parameter 1 to be resource, boolean given 
PHP Warning: file_put_contents(): Filename cannot be empty

如何在从Canvas创建之前调整图像大小？

0 个答案: