PHP can download pictures, but the downloaded pictures display errors. What is the reason?

The same thing happens when you switch to other pictures and cannot be displayed. Why is this happening?

Haha, this is quite troublesome. Check where there are spaces or empty newlines in the code, or try ob_start() output buffering. After testing, there is no problem with the code. First check if there is any problem with the file. If the file was good before downloading, check if there is output in front of the header

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