Foreach循环+关联数组

Question

如果我有以下代码:

$employeeAges;
$employeeAges["Lisa"] = "28";
$employeeAges["Jack"] = "16";
$employeeAges["Ryan"] = "35";
$employeeAges["Rachel"] = "46";
$employeeAges["Grace"] = "34";
foreach( $employeeAges as $name => $age){
    echo "Name: $name, Age: $age <br />";
}

如何输出特定信息?下面是一个书写错误的例子:

foreach( $employeeAges as $name => $age ) {
     $selective = $name["Lisa"]->$age;
     $secondary = $name["Grace"]->$age;
     echo "The person you're looking for is $selective years old. And the other one is $secondary years old.";
}

如您所见，我只想获取具体$key的$值。上面的代码输出如下错误:

Trying to get property of non-object 

有人可以帮助这段代码吗?大大赞赏。

Answer 1

如果我没理解错，你只是想知道某个人的年龄，那就这样做:

$selective = $employeeAges["Lisa"];
$secondary = $employeeAges["Grace"];
echo "The person you're looking for is $selective years old. And the other one is $secondary years old.";

->操作符用于访问对象的命名成员。参见:http://www.php.net/manual/en/language.oop5.basic.php

如注释中所述，要遍历数组以查找特定的键，请执行:

foreach ($employeeAges as $name => $age) {
    if ($name == "Grace") {
        echo $name . " is " . $age . " years old";
        break;
    }
}

Answer 2

我对这个问题有不同的理解

<?php
//Assuming this is your array
$employeeAges["Lisa"] = "28";
$employeeAges["Jack"] = "16";
$employeeAges["Ryan"] = "35";
$employeeAges["Rachel"] = "46";
$employeeAges["Grace"] = "34";
echo $employeeAges["Lisa"]; //Will output 28
echo $employeeAges["Jack"]; //Will output 16
echo $employeeAges["Grace"]; //Will output 34

您只需要指定您想要的键，它将输出值

Answer 3

那么您只想打印出年龄?

$employeeAges;
$employeeAges["Lisa"] = "28";
$employeeAges["Jack"] = "16";
$employeeAges["Ryan"] = "35";
$employeeAges["Rachel"] = "46";

$employeeAges["Grace"] = "34";

foreach($employeeAges as $name=>$age) {
  echo $age;
}

使用像这样的foreach循环只是强制键进入$name，值进入$age，而不必调用对象，因此你的错误。

我认为@jli有一个更好的答案适合你的问题。