PHP库对象错误 [英] PHP library object error

问题描述

我在imagick php库中遇到问题.

I am having an issue with imagick php library.

我正在文件系统中进行递归搜索，并查找任何pdf文件.

I am doing a recursive search in my file system and look for any pdf files.

    $it = new RecursiveDirectoryIterator("/test/project");
    $display = Array ('pdf');
    foreach(new RecursiveIteratorIterator($it) as $file){
        if (in_array(strtolower(array_pop(explode('.', $file))), $display))
        {
            if(file_exists($file)){
                echo $file;     //this would echo /test/project/test1.pdf
                $im = new Imagick($file);
                $im->setImageFormat("jpg");

                file_put_contents('test.txt', $im);
            }
        }
    }

但是，我收到一个错误提示

However, I am getting an error saying

Fatal error:  Uncaught exception 'ImagickException' with message 'Can not process empty Imagick object' in /test.php:57
Stack trace:
#0 /test.php(57): Imagick->setimageformat('jpg')
#1 {main}
  thrown in /test.php on line 57

line 57 is  $im->setImageFormat("jpg");

但是，如果我将我的$im = new Imagick($file)替换为$im = new Imagick('/test/project/test1.pdf'),，该错误消失了.

However, if I replace my $im = new Imagick($file) with $im = new Imagick('/test/project/test1.pdf'), the error is gone.

我不知道为什么会这样.有人可以给我提示这个问题吗?非常感谢

I don't know why this is happening. Can someone give me a hint for this issue? Thanks so much

推荐答案

@pozs指出

注1:您的$ file变量是一个对象SplFileInfo，但是您是 总是像字符串一样使用它.

Note 1: Your $file variable is an object SplFileInfo, but you are using it always like a string.

这是一个代码段，可让您将文件名作为字符串获取，并具有获取文件扩展名的优化方法:

Here's a code snippet which gets you the filename as string and has an optimized method to get the file extension:

<?php
    $display           = array ('pdf');
    $directoryIterator = new RecursiveDirectoryIterator('./test/project');

    // The key of the iterator is a string with the filename 
    foreach (new RecursiveIteratorIterator($directoryIterator) as $fileName => $file) {

        // Optimized method to get the file extension
        $fileExtension = pathinfo($fileName, PATHINFO_EXTENSION);

        if (in_array(strtolower($fileExtension), $display)) {
            if(file_exists($fileName)){
                echo "{$fileName}\n";

                // Just do what you want with Imagick here
            }
        }

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