一维数组和foreach循环遍历数组

$cars=array("Volvo","BMW","Toyota");

人工分配 ID 键：

$cars[0]="Volvo";
$cars[1]="BMW";
$cars[2]="Toyota";

PHP 关联数组

$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");

or:

$age['Peter']="35";
$age['Ben']="37";
$age['Joe']="43";

获取数组长度 -count()函数

echo count($List1);

遍历数组

<?php
// 数值数组
$List1 = array("neko1", "neko2", "neko3", "neko4", "neko5");
// 关联数组
$List2 = ["neko1" => 1, "neko2" => 2, "neko3", "neko4", "neko5" => 5];

// 遍历数组
for ($i = 0; $i < count($List1); $i++) {
    echo $List1[$i] . "<br>";
}

foreach ($List2 as $value) {
    echo $value . "<br>";
}

foreach ($List2 as $key => $value) {
    echo $key . $value . "<br>";
}