PHP recursion print all elements of a multidimensional array with keys

Question

I found the following code, which prints all the elements of an array fine. How can I modify it to print a key one time and then all the values corresponding to the key, then another key, then all values corresponding to key? I also would like to modify it so it only prints the first 9 values (no more than this) for each key.

 function printAll($a) {
  if (!is_array($a)) {
    echo $a, ' ';
     return;
   }

   foreach($a as $v) {
   printAll($v);
  }
 }

@ Steven Farley It's not letting me accept for another 2 minutes. — user1605871
– user1605871, Commented Dec 22, 2012 at 21:24
@user1605871 You should do this for the other 7 questions, you can find the questions you have asked in the past by visiting your profile — PhearOfRayne
– PhearOfRayne, Commented Dec 22, 2012 at 21:25
@ Steven Farley. Will do. Sry I didn't realize you could do that. — user1605871
– user1605871, Commented Dec 22, 2012 at 21:26

ABraut · Accepted Answer · 2015-09-18 20:17:04Z

I am assuming you want something non-programming humans can make some sort of sense out of.

function pretty_dump($arr, $d=1){
    if ($d==1) echo "<pre>";    // HTML Only
    if (is_array($arr)){
        foreach($arr as $k=>$v){
            for ($i=0;$i<$d;$i++){
                echo "\t";
            }
            if (is_array($v)){
                echo $k.PHP_EOL;
                Pretty_Dump($v, $d+1);
            } else {
                echo $k."\t".$v.PHP_EOL;
            }
        }
    }
    if ($d==1) echo "</pre>";   // HTML Only
}

Usage:

$myarray=array(
    'mammals'=>array(
        'cats'=>array(
            'cheetah',
            'lion',
            'cougar'
        ),
        'dogs'=>array(
            'big'=>'Scooby',
            'small'=>'chihuahua',
            'medium'=>array(
                'pumi',
                'bulldog',
                'boxer'
            )
        ),
    ),
    'fish'=>'fish',
    'birds'=>array(
        'flying'=>array(
            'mallard',
            'condor',
            'gull'
        ),
        'nonflying'=>'emu'
    )
);

pretty_dump($myarray);

Output:

    mammals
        cats
            0   cheetah
            1   lion
            2   cougar
        dogs
            big Scooby
            small   chihuahua
            medium
                0   pumi
                1   bulldog
                2   boxer
    fish    fish
    birds
        flying
            0   mallard
            1   condor
            2   gull
        nonflying   emu

PhearOfRayne · Accepted Answer · 2012-12-22 21:35:17Z

4

function printAll($a) {
    if (!is_array($a)) {
        echo $a, ' ';
        return;
    }

    foreach($a as $k => $value) {
         if($k<10){
             printAll($k);
             printAll($value);
        }
    }
}

edited Dec 22, 2012 at 21:35

PhearOfRayne

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answered Dec 22, 2012 at 21:14

v0d1ch

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1 Comment

user1605871 Over a year ago

That only print key values. Not the values. What about printing the values now?

Niet the Dark Absol · Accepted Answer · 2012-12-22 21:13:14Z

2

What's wrong with print_r, var_dump or var_export?

That aside, read the documentation on foreach and you'll clearly see how to get the key you're iterating over.

answered Dec 22, 2012 at 21:13

Niet the Dark Absol

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Comments

Ian Atkin · Accepted Answer · 2012-12-22 21:20:17Z

2

function printAll($a) {
  foreach ($a as $k => $v) {
    echo $k, ' ';
  }

  printAllVals($a);
}

function printAllVals($a) {
  if (!is_array($a)) {
    echo $a, ' ';
      return;
   }

   foreach($a as $k => $v) {
     if ($k < 10) {
       printAllVals($v);
     }
   }
}

answered Dec 22, 2012 at 21:20

Ian Atkin

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4 Comments

user1605871 Over a year ago

What about limiting less than 9 values per key?

user1605871 Over a year ago

That works. Except one slight problem. I want to be able to print the key, then the first 9 values in key. Then print the next key, then the first 9 values in the key. Right now, the code prints all keys, then all values. How would I change this?

Ian Atkin Over a year ago

Your question says, "to print the keys of the arrays one time and then all the values".

user1605871 Over a year ago

Sry, I meant one key, then 9 values, another key, then 9 values.

hsz · Accepted Answer · 2012-12-22 21:13:08Z

0

Try with:

foreach($a as $k => $v)

where $k is your key and $v is still value.

answered Dec 22, 2012 at 21:13

hsz

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