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 — Encuentra si una variable es un recurso
Lista de parámetros
- var
-
La variable a ser evaluada.
Valores retornados
Devuelve TRUE si var es un valor de tipo resource, FALSE de lo contrario.
Ejemplos
Example #1 Ejemplo de is_resource()
<?php
$enlace_bd = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($enlace_bd)) {
die('No pudo realizarse la conexión : ' . mysql_error());
}
?>
add a note
User Contributed Notesis_resource
tacomage at NOSPAM dot devilishly-deviant dot net
07-Aug-2004 03:10
07-Aug-2004 03:10