PHP列出数组名称和值

I have an array:

我有一个数组:

<?php
// My PHP version is 5.3.5
$arr = array("num"=>6,"book"=>"Polyanna","name"=>"Fred","age"=>8)
?>

How do I list the category's in the array and their values, to result something like this:

num: 6
book: Polyanna
name: Fred
age: 8

如何列出数组中的类别及其值，从而得到如下结果:num: 6书:Polyanna name: Fred age: 8

3 个解决方案

#1

First, you can't write arrays like that in PHP. You need to use this notation:

首先，不能用PHP编写这样的数组。你需要使用这个符号:

<?php
$arr = array('num' => 6, 'book' => 'Polyanna', 'name' => 'Fred', 'age' => 8);
?>

To list as you described, a foreach loop will suffice:

如你所述，一个foreach循环就足够了:

<?php
$final_str = "";
foreach ( $arr as $key => $value ) {
    $final_str .= $key . ": " . $value . "\n";
}
?>

Or, if you just need to echo the data:

或者，如果您只需要回显数据:

<?php
foreach ( $arr as $key => $value ) {
    echo $key . ": " . $value . "\n";
}
?>

#2

You want foreach.

你想要foreach。

#3

You need => instead of = while declaring array

声明数组时需要=>而不是=

$arr = array("num"=>6,"book"=>"Polyanna","name"=>"Fred","age"=>8)

and iterate through foreach loop to retrieve values

遍历foreach循环以检索值

foreach ($arr as $key => $value)
{
   echo $key. ":". $value;
}