The filter_has_var() function checks whether a variable of the specified input type exists.
Returns TRUE if successful and FALSE if failed.
filter_has_var(type, variable)
| parameter | describe |
|---|---|
| type | Required. Specifies the type to check. Possible input types: INPUT_GET INPUT_POST INPUT_COOKIE INPUT_SERVER INPUT_ENV |
| variable | Required. Specifies the variables to check. |
In this example, the input variable "name" is sent to the PHP page:
<?phpif(!filter_has_var(INPUT_GET, "name")) { echo("Input type does not exist"); }else { echo("Input type exists"); }?>The output of the code looks like this:
Input type exists