请问下面两句分别是什么意思？谢了
$file = fopen($filename, 'r') or exit("unable to open file ($filename)"); $file = fopen($filename, 'r
$file = fopen($filename, 'r') or exit("unable to open file ($filename)"); $file = fopen($filename, 'r
阅读背景：
简单问题，请问$file = fopen($filename, 'r') or exit("unable to open file ($filename)");
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