Ka=Ping Yee’s Equality Test
Here’s a quickie PHP script based on the one that appears in Ka-Ping Yee’s LiveJournal entry titled Why PHP Should Never Be Taught:
<?php
$a = 0;
$b = “eggs”;
$c = “spam”;
$e = “eggs”;

echo “<h1>The \”==\” Exercise</h1>”;
echo “<ul>”;
echo “<li>\$a is $a</li>”;
echo “<li>\$b is $b</li>”;
echo “<li>\$c is $c</li>”;
echo “<li>\$d is undefined</li>”;
echo “<li>\$e is $e</li>”;
echo “</ul>”;

echo ($a [...]