What potential issues can arise when caching PDF files in PHP?

Potential issues that can arise when caching PDF files in PHP include outdated or incorrect cached files being served to users, leading to inconsistencies in the displayed content. To solve this issue, you can implement a cache-control mechanism to control the caching duration of the PDF files. 

```php
// Set the cache control headers to prevent outdated cached files from being served
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
```
This code snippet sets the cache-control headers to ensure that the PDF files are not cached or are revalidated before being served to users, preventing outdated content from being displayed.

Keywords

caching PDF files PHP memory consumption file corruption

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