i have question for query string
i have page wehere i pass query string like that
abc.php?id=12
some time query sting "id" is not passed like
abc.php
and some time value of id is empty
abc.php?id=
and in the above 2 possibilities pages gives error.
how to fix this ?
If you check it correctly using isset() and empty() you should be able to avoid any problems.
Check if $_GET['id'] is set (using isset() ) before attempting to do anything with it.
Applying checks using the isset() language construct will supress errors and allow you to access array keys that may not exist. Here is a small function for transparent existance of a value.
$myID = getInput('id'); // Returns 'null' if ID doesn't exist but throws no PHP errors
$myID = getInput('id', 50); // Returns 50 if your ID doesn't exist
With this you can perform validation checks to make sure you have an ID
if( ($myID = getInput('id', 0)) < 1) {
die('Invalid ID Value');
}
die("My ID is: $myID");
function getInput($key, $default = null) {
return isset($_GET[$key]) && $_GET[$key] != null ? $_GET[$key] : $default;
}
You should always validate the incoming data before using it. In this case use isset to test if the variable exists and has a value other than null and use ctype_digit to check if the value consists only of digit characters.
check the below condition
if($_GET['id'] == '') {
// Your Condition Here
} else if($_GET['id'] != '') {
// Your Condition Here
} else if(isset($_GET['id'])) {
// Your Condition Here
}
Hope this Helps.
