What is a resource? Which functions return/create resource?

1.	What is a resource? Which functions return/create resource?
Answer» A resource is a special VARIABLE, holding a reference to an external resource. Resources are CREATED and used by special functions. The following is a list of functions which create, USE or destroy PHP resources. The function is_resource() can be used to determine if a variable is a resource and get_resource_type() will return the TYPE of resource it is. HTTPS://www.php.net/manual/en/resource.php

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