PHP filter_has_var() Function
The PHP filter_has_var() function checks if variable of specified type exists or not. It returns true on success or false on failure.
Syntax
filter_has_var(input_type, var_name)
Parameters
input_type |
Required. Specify the input type. It can be one of the following:
|
var_name |
Required. Specify the variable name to check. |
Return Value
Returns true on success or false on failure.
Example: filter_has_var() example
In the example below, filter_has_var() function is used to check if the input variable "email" is sent to the PHP page, through the GET method.
<?php
//checking input variable "email"
if (!filter_has_var(INPUT_GET, "email")) {
echo("Email not found");
} else {
echo("Email found");
}
?>
The output of the above code will be:
Email not found
❮ PHP Filter Reference
