Language Basics Php

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  4. $b is assigned a copy of $a, and in the second part, $b is assigned a reference to $a
$a = 5; 
$b = $a; 
$a = 7; 
echo "\$a = $a and \$b = $b\n"; 
$a = 5; 
$b = &$a; 
$a = 7; 
echo "\$a = $a and \$b = $b\n"; 
?>