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php/e20define.php

<html>
<h2><?php echo basename(__file__); ?> PHP define</h3>
<?php 
require_once('env.php');
outBegin();

echo 'phpDemo2 begin: undefined constant abc =' . abc . ', defined=' . defined('abc') . "\n";
echo 'phpDemo2 begin: undefined constant @abc =' . @abc . ', defined=' . defined('abc') . "\n";
    define('abc', 'defined value of constant abc');
echo 'phpDemo2 end: after define constant abc =' . abc . ', defined=' . defined('abc') . "\n";
    define('abc', 'second define of constant abc');
echo 'phpDemo2 end: after second define constant abc =' . abc . ', defined=' . defined('abc') . "\n";

outEnd(__file__);
?>