Array_loop_md

On a PHP coding forum someone ask how to loop a certain array.

The data was in Json format (not shown), but this will give a good idea of how to handle looping an array.
I just named the Json data $mydata.

First json decode it:
```
$decoded = json_decode($mydata, true);

// I just put the json in the variable $mydata to work with.
```


The array is this:
```
array:3 [▼
  "status" => 200
  "data" => array:7 [▼
    "id" => 5
    "salescode" => "sales1"
    "username" => "Sales1"
    "role" => "sales"
    "parent_id" => 10
    "created_at" => "2020-07-04 19:57:23"
    "updated_at" => "2020-07-05 02:13:18"
  ]
  "role" => array:2 [▼
    0 => array:1 [▼
      0 => array:5 [▼
        "id" => 10
        "parent_id" => 11
        "code" => "tl"
        "username" => "admin"
        "role" => "admin"
      ]
    ]
    1 => array:2 [▼
      0 => array:5 [▼
        "id" => 11
        "parent_id" => 12
        "code" => "sp01"
        "username" => "Supervisor"
        "role" => "supervisor"
      ]
      1 => array:5 [▼
        "id" => 26
        "parent_id" => 12
        "code" => "sp02"
        "username" => "Supervisor"
        "role" => "supervisor"
      ]
    ]
  ]
]
```

They wanted to loop the role section.

So the role section would be:
```
$decoded["role"]
```

Next get the keys for that part of the array:
```
$keys = array_keys($decoded["role"]);
```

Notice 2 nestings under that, so 2 foreach loops:
```
        foreach ($decoded["role"] as $key => $value) {
            if (is_array($value)) {
                for ($j = 0; $j < count($value); $j++) {
                    foreach ($value[$keys[$j]] as $a => $b) {
                        echo $a . " : " . $b . "<br>";
                    }
                    echo "-----------------------------------";
                    echo "<br>";
                }
            }
        }
```

The output:
```
id : 10
parent_id : 11
code : tl
username : admin
role : admin
-----------------------------------
id : 11
parent_id : 12
code : sp01
username : Supervisor
role : supervisor
-----------------------------------
id : 26
parent_id : 12
code : sp02
username : Supervisor
role : supervisor
-----------------------------------
```

The echo with ------  is just for demo, you would probably use a table or ul li element to display in the view.

It doesn't cover all cases, but it should give a good idea of looping an array.

And there are other array methods that help with looping, see the PHP manual for more on array techniques.

You can also use a flatten function on the section you need, so:

        $decoded = json_decode($mydata, true);
        $s = $this->array_flatten($decoded["role"]);
        $keys = array_keys($s);
        for ($i = 0; $i < count($s); $i++) {       //         <---  To loop over each sub array
            foreach ($s[$keys[$i]] as $key => $value) {
                echo $key . " : " . $value . "<br>";
            }
            echo "-----------------------------------";
            echo "<br>";
        }
        

Looping over shows:

id : 10
parent_id : 11
code : tl
username : admin
role : admin
-----------------------------------
id : 11
parent_id : 12
code : sp01
username : Supervisor
role : supervisor
-----------------------------------
id : 26
parent_id : 12
code : sp02
username : Supervisor
role : supervisor
-----------------------------------

Here is flatten function I found in a S.O. post:

    public function array_flatten($a, $flat = []) {
        $entry = [];
        foreach ($a as $key => $el) {
            if (is_array($el)) {
                $flat = $this->array_flatten($el, $flat);
            } else {
                $entry[$key] = $el;
            }
        }
        if (!empty($entry)) {
            $flat[] = $entry;
        }
        return $flat;
    }

But again, look at various array techniques in the PHP manual.