Runtime Error

What This Error Means

This error occurs when a function that expects a resource (such as a file or database connection) is called with a boolean value instead.

Why It Happens

This error typically happens when a function returns a boolean value instead of a resource, and the developer assumes it is a resource. This can be due to a misunderstanding of the function's return value or a bug in the function itself.

How to Fix It

1. 1To fix this error, you need to ensure that the function is called with a valid resource. Check the function's documentation to see what type of resource it expects. If the function is supposed to return a resource, check its implementation to see why it is returning a boolean value instead. Then, modify the code to handle the correct resource type. For example, if the function is supposed to return a file resource, you can check if the return value is a resource before passing it to fclose():
2. 2// Before (broken code)
3. 3close($file = fopen("data.csv", "r"));
4. 4// After (fixed code)
5. 5$file = fopen("data.csv", "r");
6. 6if (!is_resource($file)) {
7. 7 throw new Exception("Error opening file.");
8. 8}
9. 9close($file);

Example Code Solution

close($file = fopen("data.csv", "r"));

$file = fopen("data.csv", "r");
if (!is_resource($file)) {
    throw new Exception("Error opening file.");
}
close($file);