PHP中奇怪的数字 - 马永占 译

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原文地址：http://phplens.com/phpeverywhere/?q=node/view/249
由一条别人adodb的bug引发的思考

echo 09," => (09) <br>";
echo 9," => (9) <br>";

你可以试一下.输出结果是:

0 => (09)

9 => (9)

而不是

09 => (09)

9 => (9)





这个译者做了下测试,经过分析得出.0开头的数字会被当成8进制,0x开头的会被当成16进制,如下:

echo 0x11," => (011) <br>";

echo 010," => (010) <br>";

这个会输出:

17 => (011)

8 => (010)

当然是10x16+1=17

1x8+0=8

OK.









Someone reported a bug in ADOdb, the open source db library i maintain. I went crazy for half an hour until i realised the problem. Here's a little gotcha you can try:
echo 09," => (09) <br>";
echo 9," => (9) <br>";
If you expect the above code to produce the same values, you are sadly mistaken. Try it. I will post a followup later :)