abstract：//2個整數(shù)相加的和<meta http-equiv="content-type" content="text/html;charset=utf-8"><?php$ab='1';$bc='2';$dd=$ab+$bc;echo $dd;?>

//2個整數(shù)相加的和

<meta http-equiv="content-type" content="text/html;charset=utf-8">
<?php
$ab='1';
$bc='2';
$dd=$ab+$bc;
echo $dd;
?>

Correcting teacher：天蓬老師Correction time：2019-09-11 14:36:07
Teacher's summary：既然是估整數(shù)的相加, 就沒必要使用數(shù)字字符串, 依賴自動類型轉(zhuǎn)換來完成它