<?php error_reporting(E_ALL); define('great','my'); $great='fantastic'; $my='my value'; echo "This is ${great }<br/>\n";//output:my value echo "This is ${ great}<br/>\n";//output:my value echo "This is ${ great }<br/>\n";//output:my value echo "This is ${great}<br/>\n";//output:fantastic
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