php - この変数のエコーが 16 になるのはなぜですか?

Question

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

この変数をエコーし​​ようとすると、「16」しか表示されません。

手伝ってくれませんか？

Answer 1

PHP の連結演算子は.、+

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

Answer 2

PHP では、連結演算子は., ではありません+

そう：

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