Error Undefined index , here's what's wrong

Every line reports an error, I suspect it is an environmental problem, but the echo is normal. Please give me some advice on the code

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Every line reports an error, I suspect it is an environmental problem, but the echo is normal. Please give me some advice on the code

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Because $_REQUEST is empty, those indexes are invalid. You can try changing it to this:

<code class="php">$path = isset($_REQUEST['path']) ? $_REQUEST['path'] : PATH;</code>

You can use print_r($_REQUEST); to output the elements in the $_REQUEST array;

This error is that there is no array index element in $_REQUEST.