(PHP 4, PHP 5, PHP 7)
Finds whether a variable is a resource
bool is_resource ( mixed $var )
Finds whether the given variable is a resource.
Parameters:
var
The variable being evaluated.
Returns:
Returns TRUE if var is a resource, FALSE otherwise.
Notes:
is_resource() is not a strict type-checking method: it will return FALSE if var is a resource variable that has been closed.
Examples:
is_resource() example
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($db_link)) {
die('Can\'t connect : ' . mysql_error());
}
?>
See also:
The resource-type documentation - type documentation
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