is_real
Note that the use of is_resource isn't necessary in the example. mysql_connect (along with any other function that would return a resouce, I imagine) returns false on failure, so the same results could be obtained with:
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!$db_link) {
die('Can\'t connect : ' . mysql_error());
}
?>
Or even:
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass')
or die('Can\'t connect : ' . mysql_error());
}
?>
You'd be more likely to use is_resource AFTER the initial conection, to make sure the variable you intend to use as a resource is, in fact, a connection resource. You might also use is_resource as a sanity-check prior to serializing an object, since resource variables can't be serialized.
is_resource
(PHP 4, PHP 5)
is_resource — Finds whether a variable is a resource
Description
bool is_resource ( mixed $var )Finds whether the given variable is a resource.
Parameters
- var
The variable being evaluated.
Return Values
Returns TRUE if var is a resource, FALSE otherwise.
Examples
Example 2524. 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 |
| get_resource_type() |
add a note
User Contributed Notesis_resource
tacomage at NOSPAM dot devilishly-deviant dot net
07-Aug-2004 01:10
07-Aug-2004 01:10