Three small examples of PHP determining whether constants, variables and functions exist
Release: 2016-07-25 09:04:48
Original
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/* Determine whether the constant exists*/ - if (defined('MYCONSTANT')) {
- echo MYCONSTANT;
- }
//Judge whether the variable exists
- if (isset($myvar)) {
- echo "The variable $myvar exists.";
- }
//Judge whether the function exists
- if (function_exists(' imap_open')) {
- echo "Function imag_openn exists";
- } else {
- echo "Function imag_open does not existn";
- }
- ?>
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