在php开发中，有很大部分比例，我们是在操作数组，所以数组的学习非常关键~~
"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"), // $group[0]
array("name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"), // $group[1]
array("name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"), // $group[2]
"four"=>array("name"=>"xiaoming", "age"=>8, "sex"=>"男", "email"=>"xiaoming@qq.com")
);
var_dump($group[1]); // 打印结果 ： array(4) { ["name"]=> string(5) "queen" ["age"]=> int(14)
// ["sex"]=> string(3) "女" ["email"]=> string(12) "queen@qq.com" }
echo "
";
var_dump($group[1]["name"]); // 打印结果 ： string(5) "queen"
echo "
";
var_dump($group[2]["age"]); // 打印结果 ： int(55)
echo "
";
var_dump($group["four"]["email"]); // 打印结果 ： string(15) "xiaoming@qq.com"
echo "
";[
["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"], // $group[0]
["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
],
[
["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"], // $group[0]
["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
],
[
["name"=>"iwanghang", "age"=>18, "sex"=>"男", "email"=>"iwanghang@qq.com"], // $group[0]
["name"=>"queen", "age"=>14, "sex"=>"女", "email"=>"queen@qq.com"], // $group[1]
["name"=>"king", "age"=>55, "sex"=>"男", "email"=>"king@qq.com"], // $group[2]
]
];
echo '';
echo '---------- $class ----------
';
print_r($class);
echo '---------- $class[0] ----------
';
print_r($class[0]);
echo '---------- $class[0][0] ----------
';
print_r($class[0][0]);
echo '---------- $class[0][0][\'name\'] ----------
';
print_r($class[0][0]['name']);
echo '
----------- $class["group1"][0][\'name\']) -----------
';
print_r($class["group1"][0]['name']);
/**
* 打印结果：
---------- $class ----------
Array
(
[group1] => Array
(
[0] => Array
(
[name] => iwanghang
[age] => 18
[sex] => 男
[email] => iwanghang@qq.com
)
[1] => Array
(
[name] => queen
[age] => 14
[sex] => 女
[email] => queen@qq.com
)
[2] => Array
(
[name] => king
[age] => 55
[sex] => 男
[email] => king@qq.com
)
)
[0] => Array
(
[0] => Array
(
[name] => iwanghang
[age] => 18
[sex] => 男
[email] => iwanghang@qq.com
)
[1] => Array
(
[name] => queen
[age] => 14
[sex] => 女
[email] => queen@qq.com
)
[2] => Array
(
[name] => king
[age] => 55
[sex] => 男
[email] => king@qq.com
)
)
[1] => Array
(
[0] => Array
(
[name] => iwanghang
[age] => 18
[sex] => 男
[email] => iwanghang@qq.com
)
[1] => Array
(
[name] => queen
[age] => 14
[sex] => 女
[email] => queen@qq.com
)
[2] => Array
(
[name] => king
[age] => 55
[sex] => 男
[email] => king@qq.com
)
)
)
---------- $class[0] ----------
Array
(
[0] => Array
(
[name] => iwanghang
[age] => 18
[sex] => 男
[email] => iwanghang@qq.com
)
[1] => Array
(
[name] => queen
[age] => 14
[sex] => 女
[email] => queen@qq.com
)
[2] => Array
(
[name] => king
[age] => 55
[sex] => 男
[email] => king@qq.com
)
)
---------- $class[0][0] ----------
Array
(
[name] => iwanghang
[age] => 18
[sex] => 男
[email] => iwanghang@qq.com
)
---------- $class[0][0]['name'] ----------
iwanghang
----------- $class["group1"][0]['name']) -----------
iwanghang
*/';
$arr = ["one", "two", "three", "four"];
echo '---------- isset($arr[2]) ----------
';
if (isset($arr[2])){ // 打印结果：存在
echo "存在";
}else{
echo "不存在";
}
echo "
";
echo '---------- print_r($arr) ----------
';
print_r($arr); // 打印结果：Array ( [0] => one [1] => two [2] => three [3] => four )
echo "
";
echo '---------- unset($arr[2]) ----------
';
unset($arr[2]);
if (isset($arr[2])){ // 打印结果：不存在
echo "存在";
}else{
echo "不存在";
}
echo "
";
echo '---------- print_r($arr) ----------
';
print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four )
echo "
";
echo '---------- $arr[2] = null ----------
';
$arr[2] = null;
if (isset($arr[2])){ // 打印结果：不存在
echo "存在";
}else{
echo "不存在";
}
echo "
";
echo '---------- print_r($arr) ----------
';
print_r($arr); // 打印结果：Array ( [0] => one [1] => two [3] => four [2] => )
echo "
";1){
if ($i % $n == 0){
echo $i."除以".$n."余数为0,所以删除".$arr[$i]."
";
unset($arr[$i]);
}else{
$arr[] = $arr[$i];
print_r($arr);
echo "
";
unset($arr[$i]);
}
$i++;
}
print_r($arr);
}以上就是Android程序员学PHP开发(20)-数组(2)多维数组和实际应用-PhpStorm的内容，更多相关内容请关注PHP中文网（www.php.cn）！
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