How can I detect if a value exists in specific array?

Question

This is my array animals:

array(5) {
  [0]=>
  array(3) {
    ["number"]=>
    string(3) "123"
    ["cat"]=>
    string(4) "fred"
    ["dog"]=>
    string(3) "ted"
  }
  [1]=>
  array(3) {
    ["number"]=>
    string(3) "456"
    ["cat"]=>
    string(4) "todd"
    ["dog"]=>
    string(4) "jane"
  }
  [2]=>
  array(3) {
    ["number"]=>
    string(3) "789"
    ["cat"]=>
    string(3) "sam"
    ["dog"]=>
    string(3) "bob"
  }
  [3]=>
  array(1) {
    ["city"]=>
    string(7) "atlanta"
  }
  [4]=>
  array(1) {
    ["farm"]=>
    string(7) "johnson"
  }
}

I want to detect the following:

For each array that contains number I need to find out if cat and dog exist.

This is my try:

  foreach($animals as $row) {
       if (array_key_exists('number',$row)){                
          if(empty($row['dog'])){
             echo "dog missing";
          }
          if(empty($row['cat'])){
             echo "cat missing";
          }
       }
    }

So if I for example delete in my file fred, ted and jane my result is:

cat is missing
dog is missing
dog is missing

But I need to know more specific which cat or dog is missing. So the result I wish to have is:

cat is missing in number 123
dog is missing in number 123
dog is missing in number 456

My problem is that I do not know how to get the connection from the animal to the number.

Take a look at phps array-walk() function: php.net/manual/en/function.array-walk.php — arkascha
– arkascha, Commented Nov 11, 2015 at 10:42
You might want to use array_key_exists() or isSet() instead of the empty() because of false positives (empty(0) returns TRUE) — kero
– kero, Commented Nov 11, 2015 at 10:44

Erwin Moller · Accepted Answer · 2015-11-11 10:45:12Z

1

Can't you just add it to the echo? Like:

foreach($animals as $row) {
       if (array_key_exists('number',$row)){                
          if(empty($row['dog'])){
             echo "dog missing in number ".$row["number"];
          }
          if(empty($row['cat'])){
             echo "cat missing in number ".$row["number"];
          }
       }
    }

answered Nov 11, 2015 at 10:45

Erwin Moller

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2 Comments

peace_love Over a year ago

oh yes, this is true.. I was thinking to complicated :D

Thamilhan Over a year ago

I was two mins faster :)

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