Finds whether a variable is a resource
Syntax
is_resource(mixed $value): bool
Parameters
valueThe variable being evaluated.
Return
Returns true if value is a resource, false otherwise.
Examples
1 · value
<? $value = tmpfile(); $return = is_resource($value); var_dump($value, $return); ?>
resource(2) of type (stream) bool(true)
2 · open
<?
$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt';
$mode = 'r';
$value = fopen($filename, $mode);
$return = is_resource($value);
var_dump($value, $return);
fclose($value);
?>resource(3) of type (stream) bool(true)
3 · closed
<? $filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/file.txt'; $mode = 'r'; $value = fopen($filename, $mode); fclose($value); $return = is_resource($value); var_dump($value, $return); ?>
resource(3) of type (Unknown) bool(false)
