filter_input() function in PHP

The filter_input() function gets a name of external variable and filters it optionally.

Syntax

filter_input(type, var, filtername, options)

Parameters

• type − There are five types of inputs to check i.e. INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.

• var − The name of variable.

• filtername − The name of filter to get ID.

• options − Specifies options to use.

Return

The filter_input() function returns the value of the variable on success, false on failure, or null if the parameter of variable is not set.

Example

 Live Demo

<?php
   if (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL)) {
      echo "E-Mail isn't valid!";
   } else {
      echo "E-Mail is valid!";
   }
?>

Output

The following is the output.

E-Mail isn't valid!