總結回聲php

Question

由於PHP的行爲，我有點沮喪。 爲什麼PHP解釋這樣我的代碼：

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

Answer 1

你也可以改變上面的代碼爲：

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

?>