Variables Defined Outside Functions Are Inaccessible from Within a Function by Default
<html>
<head>
<title>No Default Access to Globals in Functions</title>
</head>
<body>
<div>
<?php
$life = 42;
function meaningOfLife() {
print "The meaning of life is $life<br />";
}
meaningOfLife();
?>
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</body>
</html>