php how to get key value of an array of arrays

Question

I have the following setup where I'm trying to use an array of array structure. I'm not sure how to get the key value once the value is found in the array of arrays.

$testboat = 'smallest boat';
$allboats = array(40=>array(1=>'big boat',
                            2=>'bigger boat'
                      ),
                  30=>array(1=>'little boat',
                           2=>'tiny boat',
                           3=>'smallest boat'));

foreach($allboats as $boats){
    foreach($boats as $boat){
       if($testboat == $boat) {

       /*looking to echo the key or value 30; */

      }  

   }
}

thanks but I find that's the wrong place to start. foreach($allboats as $key =>$boats) provides the correct place. — DCR
– DCR, Commented Dec 14, 2016 at 21:33

AbraCadaver · Accepted Answer · 2016-12-14 21:32:51Z

1

Use the $key => $value syntax of foreach(). Also, no need to loop through the inner arrays:

foreach($allboats as $key => $boats){
    if(in_array($testboat, $boats)) {
        echo $key;
        break; //if you want to stop after found
    }
}

If you want to get the outer key and the inner key:

foreach($allboats as $key => $boats){
    if(($inner_key = array_search($testboat, $boats)) !== false) {
        echo "$key and $inner_key";
        break; //if you want to stop after found
    }
}

answered Dec 14, 2016 at 21:32

AbraCadaver

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2 Comments

FullStack Over a year ago

can i know what for the !== false??

AbraCadaver Over a year ago

@FullStack Strict not equal to false, because array_search can return 0 as a key which would loosely evaluate to false.

Iarwa1n · Accepted Answer · 2016-12-14 21:27:10Z

0

$testboat = 'smallest boat';
$allboats = array(40=>array(1=>'big boat',
                            2=>'bigger boat'
                      ),
                  30=>array(1=>'little boat',
                           2=>'tiny boat',
                           3=>'smallest boat'));

foreach($allboats as $id => $boats){
    //$id will be 40, then 30
    foreach($boats as $id2 => $boat){
        //$id2 will be 1,2...
       if($testboat == $boat) {
       echo $id . '-' . $id2;
       /*looking to echo the key or value 30; */

      }  
   }
}

answered Dec 14, 2016 at 21:27

Iarwa1n

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Comments

Emmanuel Brun d'Aubignosc · Accepted Answer · 2016-12-14 21:36:17Z

0

You'd have to do the following:

foreach($allboats as key1 => $boats){
    foreach($boats as key2 => $boat){

answered Dec 14, 2016 at 21:36

Emmanuel Brun d'Aubignosc

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