remove element from a multidimensional array using string index

Question

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
        )
)

Thava · Accepted Answer · 2022-10-03 14:37:50Z

1

use the unset to remove an element from an associative array

$array = [
  "06:00 AM - 06:05 AM" => [
    0 => 1
  ],
  "06:05 AM - 06:10 AM" => [
    1 => 1
  ]
];

unset($array["06:00 AM - 06:05 AM"]);

echo json_encode($array);

answered Oct 3, 2022 at 14:37

Thava

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amamoslavida · Accepted Answer · 2022-10-03 14:18:18Z

0

$array = [
  "06:00 AM - 06:05 AM" => [
    0 => 1
  ],
  "06:05 AM - 06:10 AM" => [
    1 => 1
  ]
  ];

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

  $arrayNew = array();

  foreach ($array as $key => $value) {
    if ($key == $toBeRemoved) {
      continue;
    }
    $arrayNew[$key] = $value;
  }

  var_dump($arrayNew);

answered Oct 3, 2022 at 14:18

amamoslavida

494 bronze badges

2 Comments

Lucky Person Over a year ago

Thanks @amamoslavida , but what if I will still use the same $array for another loop iteration, the only difference is, the data are now reduced.

amamoslavida Over a year ago

in my opinion, you should keep time data in database as TIMESTAMP, check php time() function, and better aproach is to use a database class which is written in PDO or use database classes of frameworks, such as codeigniter.

Shahzad Manzoor · Accepted Answer · 2022-10-03 14:22:39Z

0

array_walk_recursive Keys having sub array will not passed to this recursive function.

recursive doc.

Example:

<?php
$sweet = array('a' => 'apple', 'b' => 'banana');
$fruits = array('sweet' => $sweet, 'sour' => 'lemon');

function test_print($item, $key)
{
    echo "$key holds $item\n";
}

array_walk_recursive($fruits, 'test_print');
?>

output:

a holds apple
b holds banana
sour holds lemon

You may notice that the key 'sweet' is never displayed. Any key that holds an array will not be passed to the function.

you may use following code snip

<?php
$result = [
  "06:00 AM - 06:05 AM" => [
    0 => 1
  ],
  "06:05 AM - 06:10 AM" => [
    1 => 1
  ]
];

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

foreach($result as $key => $value){
    if($key == $toBeRemoved ){
        unset($result[$key]);
    }
}

print_r($result);

?>

answered Oct 3, 2022 at 14:22

Shahzad Manzoor

1608 bronze badges

2 Comments

Lucky Person Over a year ago

Thank you @Shahzad Manzoor , let me try this one.

Lucky Person Over a year ago

You explained it well, thank you.

Hamid Raza · Accepted Answer · 2022-10-04 16:14:07Z

0

You can try this:

$array = [
    "06:00 AM - 06:05 AM" => [
        0 => 1
    ],
    "06:05 AM - 06:10 AM" => [
        1 => 1
    ]
];
$new_array = [];
foreach($array as $key => $value){
    foreach ($value as $val) {
        $new_array[] = $val;
    }
}
echo '<pre>';
print_r($new_array);
echo '</pre>';

Result:

Array
(
    [0] => 1
    [1] => 1
)

answered Oct 4, 2022 at 16:14

Hamid Raza

421 silver badge8 bronze badges

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