John Davidson

Message:

I have a multidimensional array which are timestamps of school schedules. I want to remove the timestamps that doesn't have schedule in it, which does make sense.

Array:

$array = [

  "06:00 AM - 06:05 AM" => [

    0 => 1

  ],

  "06:05 AM - 06:10 AM" => [

    1 => 1

  ]

];

The code I'm trying (which doesn't work as expected). The goal of the code is to remove the array element with the index of 06:00 AM - 06:05 AM from the multidimensional array.

$toBeRemoved = '06:00 AM - 06:05 AM';



array_walk_recursive($array,

function (&$item, $key, $v) {

  if ($item == $v) $item = ''; 

}, $toBeRemoved);



print_r($array);

Code Output:

As you can see in the output, it doesn't removed the array element with an index of 06:00 AM - 06:05 AM

Array

(

    [06:00 AM - 06:05 AM] => Array

        (

            [0] => 1

        )

    [06:05 AM - 06:10 AM] => Array

        (

            [1] => 1

        )

)

Expected Output:

As you can see, the 06:00 AM - 06:05 AM is now gone from the array.

Array

(

    [06:05 AM - 06:10 AM] => Array

        (

            [1] => 1

        )

)

---

My Answer:
"Monday" => ["8:00 AM", "10:00 AM"],
"Tuesday" => [],
"Wednesday" => ["9:00 AM", "11:00 AM"],
"Thursday" => [],
"Friday" => ["8:30 AM", "10:30 AM"]
];

To remove the empty schedules (timestamps without any schedule), you can use the following code:

php
foreach ($array as $key => $value) {
if (empty($value)) {
unset($array[$key]);
}
}


This code will iterate through each element in the array and remove the element if the value is empty. After running this code, the updated array will look like this:

php
$array = [
"Monday" => ["8:00 AM", "10:00 AM"],
"Wednesday" => ["9:00 AM", "11:00 AM"],
"Friday" => ["8:30 AM", "10:30 AM"]
];