点号的疑惑解决思路

点号的疑惑

PHP code

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echo '1+5='.1;  //为什么这么写会报错
echo '1+5='. 1; //这句却能执行
echo '1+5='.(1);//外面弄个括号却又行了

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PHP code

echo "thr"."ee";           //输出字符串"three"
echo "twe" . "lve";        //输出字符串"twelve"
echo 1 . 2;                //输出字符串"12"
echo 1.2;                  //输出数字1.2
echo 1 ..2;                //输出字符串"10.2" <div class="clear">
                 
              
              
        
            </div>

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