PHP：打印关联数组

Question

In PHP, I have an associative array like this

$a = array('who' => 'one', 'are' => 'two', 'you' => 'three');

How to write a foreach loop that goes through the array and access the array key and value so that I can manipulate them (in other words, I would be able to get who and one assigned to two variables $key and $value ?

Answer 1

foreach ($array as $key => $value) {
    echo "Key: $key; Value: $value\n";
}

Answer 2

@Thiago already mentions the way to access the key and the corresponding value. This is of course the correct and preferred solution.

However, because you say

so I can manipulate them

I want to suggest two other approaches

1. If you only want to manipulate the value, access it as reference

    foreach ($array as $key => &$value) { $value = 'some new value'; } 

2. If you want to manipulate both the key and the value, you should going an other way

    foreach (array_keys($array) as $key) { $value = $array[$key]; unset($array[$key]); // remove old key $array['new key'] = $value; // set value into new key }