How to clean up arrays?

Question

PHP

Eats two arrays for example

[
0=>52,
1=>45,
2=>58
]

and

[
38=>47,
78=>68
45=>85,
]

it is necessary to subtract from the second array the element whose key is equal to the value of the first in this example, this is the third element of the array whose key is 45

Answer 1

Good evening.
Try starting with the following:

$a = ['0' => '52',
'1' => '45',
'2' => '58'];
$b = ['38' => '47',
'78' => '68',
'45' => '85'];
foreach ($b as $key => $value) {
  if(in_array($key, $a)){
       unset($b[$key]);
  }
}
print_r($b);