PHP中的字符串没有意义

时间:2014-08-25 02:52:07

标签: php dynamic-typing weak-typing

我正在尝试PHP的弱/动态类型属性以准备测试,并且完全被这个字符串连接的输出所困惑。有人可以解释一下这是怎么回事吗?

<?php echo  1 . "/n" . '1' + 1 ?><br />

输出:

  

2

1 个答案:

答案 0 :(得分:2)

分析:

echo  1 . "/n" . '1' + 1;

相当于

//joined first 3 items as string
echo "1/n1"+1;

相当于

//php faces '+' operator, it parses '1/n1' as number
//it stops parsing at '/n' because a number doesn't
//contain this character
echo "1"+1;

相当于

echo 1+1;