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General get value from possible input sources

/ Published in: PHP
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This can be used as a general function to get the value stored in any of the possible input sources.
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  1. /* Get a variable from the possible input sources. */
  2. function getVar($var_name) {
  3.     if (!empty($_GET[ $var_name ])) {
  4.         return $_GET[ $var_name ];
  5.     } elseif (!empty($_POST[ $var_name ])) {
  6.         return $_POST[$var_name ];
  7.     } elseif (!empty($_SESSION[ $var_name ])) {
  8.         return $_SESSION[ $var_name ];
  9.     } elseif (!empty($_COOKIE[ $var_name ])) {
  10.         return $_COOKIE[ $var_name ];
  11.     } else {
  12.         return null;
  13.     }
  14. }

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