PHP: Printing Associative Array

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?

It is described in the documentation: http://php.net/manual/en/control-structures.foreach.php. — Felix Kling, Jun 21 '11 at 16:58
possible duplicate of [PHP - How to loop through a associative array and get the key name?](http://stackoverflow.com/questions/1951690/php-how-to-loop-through-a-associative-array-and-get-the-key-name) — Felix Kling, Jun 21 '11 at 17:02

Thiago Silveira · Accepted Answer · 2014-02-25T18:30:39.383

53

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

edited Feb 25 '14 at 18:30

answered Jun 21 '11 at 16:54

Thiago Silveira

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And how to format the output? Like I have $a['who'] = 10.99999, how to echo it out only as 10.99? (too demical digits)? – Tu Hoang Jun 21 '11 at 17:00
4

@TannerHoang: That is another question and already answered: http://stackoverflow.com/search?q=php+format+decimal – Felix Kling Jun 21 '11 at 17:01
@Tanner: This feels like a completely other question. Have a look at `sprintf()` in the manual. – KingCrunch Jun 21 '11 at 17:01
It is indeed another question. Anyway, you should use `printf("%.2f", $value);` – Thiago Silveira Jun 21 '11 at 17:02
I actually used this one given Thiago `foreach` loop. `echo $key.": ".number_format($value,2)`; – Tu Hoang Jun 21 '11 at 17:06

score 8 · Answer 2 · answered Jun 21 '11 at 16:59

@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

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

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

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
}

PHP: Printing Associative Array

2 Answers2