(PHP 4, PHP 5, PHP 7)
is_resource — Finds whether a variable is a resource
is_resource ( mixed $var ) : bool
Finds whether the given variable is a resource.
var
The variable being evaluated.
Returns true if var is a resource, false otherwise.
Example #1 is_resource() example
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($db_link)) {
die('Can\'t connect : ' . mysql_error());
}
?> Note:
is_resource() is not a strict type-checking method: it will return
falseifvaris a resource variable that has been closed.
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https://www.php.net/manual/en/function.is-resource.php