PHP的for、foreach与JavaScript的for、forEach的区别

PHP

区别：

PHP中变量直接使用$符号,JS 中使用let或const。
count()为PHP系统函数 与 JS 中的 length一样是获取数组的长度。
PHP中连接符使用实心圆点.JS 中使用加号+。

1.【php】for &【JS】for

//PHP&for
<?
$nums = ["天河区","白云区","越秀区","荔湾区","海珠区","黄埔区","萝岗区","番禺区","增城区","从化区"];
for ($i=0; $i < count($nums) ; $i++) {
    echo $nums[$i].'<br/>';
}
?>

//JavaScript&for
<script>
let nums = ["天河区","白云区","越秀区","荔湾区","海珠区","黄埔区","萝岗区","番禺区","增城区","从化区"];
for (let i=0; i < nums.length ; i++) {
    console.log('广州市' + nums[i]);
}
</script>

1.【php】foreach &【JS】forEach

模板语法{可以省略用:代替 ,echo可以省略不写用=代替， }用endforeach代替以;结束

//PHP&foreach
<?
    $nums = ["天河区","白云区","越秀区","荔湾区","海珠区","黄埔区","萝岗区","番禺区","增城区","从化区"];
    //foreach (循环变量 as 当前子元素)
    foreach ($nums as $num) :
        = $num.'<br/>';
    endforeach;
?>

//JavaScript&for
<script>
let nums = ["天河区","白云区","越秀区","荔湾区","海珠区","黄埔区","萝岗区","番禺区","增城区","从化区"];
nums.forEach(num => console.log(num))
</script>