php - 这个变量 echo 怎么会变成 16？

Question

$body = "Artist: " + $artist + "Size: " + $size + "Time: " + $time + "Concept: " + $concept + "Time: " + $time + "Mod: " + $mod + "Details: " + $details;

当我尝试回显这个变量时，所有出来的都是“16”。

你们能帮忙吗？

Answer 1

PHP 中的连接运算符.不是+

$body = "Artist: " . $artist . "Size: " . $size . "Time: " . $time . "Concept: " . $concept . "Time: " . $time . "Mod: " . $mod . "Details: " . $details;

Answer 2

在 PHP 中，连接运算符是.，不是+

所以：

$body = "Artist: " . $artist . "Size: " . $size . "Time: " . $time . "Concept: " . $concept ."Time: " . $time . "Mod: " . $mod . "Details: " . $details;