Problem Iterating through a multi-dimensional array in PHP

Question

Working on a Laravel application whereby I am consuming some data from an API. I get the response as a JSON object and convert to array. It appears as a complex multi-dimensional array (nested arrays). Am trying to loop through it using a nested foreach so as to reach out to the id of each item but I keep failing..

The response is stored in a variable called usmDet

The array response

array:1 [▼
  0 => array:1 [▼
    0 => array:3 [▼
      "id" => "74696"
      "agents" => array:13 [▶]
      "policies" => array:481 [▶]
    ]
    1 => array:3 [▼
      "id" => "1525"
      "agents" => array:8 [▶]
      "policies" => array:357 [▶]
    ]
  ]
  1 => array:1 [▼
    0 => array:3 [▼
      "id" => "73401"
      "agents" => array:1 [ …1]
      "policies" => array:8 [ …8]
    ]
    1 => array:3 [▼
      "id" => "210"
      "agents" => array:13 [ …13]
      "policies" => array:773 [ …773]
    ]
  ]
]

My nested foreach

 foreach($usmDet as $key => $value){
  if(is_array($value)){
    foreach($value as $key => $value){
      echo $key." ".$value."<br>";
    }
  }
  echo "<br>";
}

The fourth bird · Accepted Answer · 2018-12-22 10:23:40Z

2

The id is part of the array, as you can access it like $value['id']

In the second foreach to prevent confusion you should select a different name for the key and the value.

Try it like this:

foreach($usmDet as $key => $value){
    if(is_array($value)){
        foreach($value as $k => $v){
            echo $v['id'] . "<br>";
        }
    }
}

Result:

Php demo

To get all the values for key "id" when multiple nested arrays, you could use array_walk_recursive

$ids = [];
array_walk_recursive($usmDet, function($value, $key) use (&$ids){
    if ($key === "id") {
        $ids[] = $value;
    }
});

print_r($ids);

Php demo

edited Dec 22, 2018 at 10:23

answered Dec 22, 2018 at 9:45

The fourth bird

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9 Comments

Martin Over a year ago

It works fine,, thanks alot,, I have checked my code and noticed that the array has gone a depth further (agents is also nested array) which contains some id property in it.. How can I access it ?

The fourth bird Over a year ago

@Martin Do you mean like this? 3v4l.org/tc79q You could use array_walk_recursive

Martin Over a year ago

I have stored the values in a variable and dd on the browser 3v4l.org/3NpBD and I get boolean true.. My objective is to store them in an array so that I can use them in the view in a foreach loop..

The fourth bird Over a year ago

That is because array_walk_recursive returns a boolean.

Martin Over a year ago

Okay,, Thanks alot sir,, You really helped me.. Had never worked with multi-dimensional arrays before

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