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is_resource

Description

The is_resource of Variable Handling for PHP finds whether a variable is a resource.

Syntax

is_resource(
    mixed $value
): bool

Parameters

value

The variable being evaluated.

Return

Returns true if value is a resource, false otherwise.

Examples

1 · value · open

<?

$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/1.txt';
$mode = 'r';

$value = fopen($filename, $mode);

    $return = is_resource($value);

    var_dump($value, $return);

fclose($value);

resource(3) of type (stream)
bool(true)

2 · value · closed

<?

$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/txt/1.txt';
$mode = 'r';

$value = fopen($filename, $mode);
fclose($value);

$return = is_resource($value);

var_dump($value, $return);

resource(3) of type (Unknown)
bool(false)