<?php // r() simply returns a reference to a given variable. function &r(&$v){return $v;} // Here, we have a scalar $a on which settype() fails to operate if // parentheses are involved. print "Scalar demonstration:\n"; $a = 1; // First with parentheses, then without. // v v settype( ( r($a) ) , "boolean"); var_dump($a); settype( r($a) , "boolean"); var_dump($a); // ^ ^
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