What are some common issues faced when including pages in PHP using variables like $layer?

One common issue faced when including pages in PHP using variables like $layer is that the variable may not be defined or may contain an unexpected value, leading to errors or incorrect page inclusions. To solve this issue, it is important to check if the variable is set before including the page and ensure that it contains a valid file path. 

if(isset($layer) && file_exists($layer)) {
    include $layer;
} else {
    echo "Error: Invalid page path";
}

Keywords

PHP include variables $layer page inclusion

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