总结回声php

Question

由于PHP的行为，我有点沮丧。 为什么PHP解释这样我的代码：

echo "We has over " . 2500 + 500 . " employees over the world"; // 500 employees over the world 

Answer 1

你也可以改变上面的代码为：

<?php 
$sum=2500 + 500; 
echo "We has over " . $sum . " employees over the world"; 

?>