A quine in PHP language

quine.php

<?
# PHP Quine written by Ian Kjos - brooke@sf.net
$y = "function q(\$q) {
\$q = str_replace('\\\\', '\\\\\\\\', \$q);
\$q = str_replace('\$', '\\\\\$', \$q);
\$q = str_replace('\\n', '\\\\n', \$q);
\$q = str_replace('\"', '\\\\\"', \$q);
return \$q;
}

echo \"<?\\n\\n\";
echo \"# PHP Quine written by Ian Kjos - brooke@sf.net \\n\\n\";
echo '\$y = \"' . q(\$y) . '\";';
echo \"\\n\\neval(\";
echo '\$y);';
echo \"\\n\\n\\n\";
";
eval($y);