样例：
$a = true;
$b = false;
$c = 086;
$d = 0x86;
echo "$a hase value: ".$a; echo "<br/>";
echo "$b hase value: ".$b; echo "<br/>";
echo "$c hase value: ".$c; echo "<br/>";
echo "$d hase value: ".$d;
输出：
1 hase value: 1
hase value:
0 hase value: 0
134 hase value: 134
原文：http://www.cnblogs.com/dong-blog/p/6013465.html