PHP DB - variable with NULL value

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Author

variable with NULL value

OKi98

2007-05-03, 6:57 pm

Hi,

one more question.

Why the variable, that contains NULL value appears to be not set. When
you try to echo it the php does not produce warning about using
undefined variable.

//$connection contains database connection handler
$result=mysql_query("select NULL as value",$connection);
$tmp=mysql_fetch_array($result);
$foo=$tmp["value"];
if (!isset($foo)) echo("\$foo is not set but does not produce warning
-$foo-");

OKi98

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