从数组中删除与我定义的自定义值匹配的第一个键值对

Question

I have array:

Array ( [0] => Array ( [0] => Apples [Query] => Apples ) [1] => Array ( [0] => Bananas [Query] => Bananas ) [2] => Array ( [0] => Bananas [Query] => Bananas ) [3] => Array ( [0] => Oranges [Query] => Oranges ) )

Unfortunately I have no control over the original structure of this array. So this is what we have to work with.

What I am trying to do is remove only the first key,value pair that matches a custom value that I define.

For Example:

$toRemove = 'Bananas';

Applied to a yet unknown miracle piece of code would result in:

Array ( [0] => Array ( [0] => Apples [Query] => Apples ) [2] => Array ( [0] => Bananas [Query] => Bananas ) [3] => Array ( [0] => Oranges [Query] => Oranges ) )

Notice how the second set of Bananas values remained untouched. I don't mind if you want to re-index because of gap this creates.

And if it wasn't challenging enough this needs to be done without a for loop.

Answer 1

...this needs to be done without a for loop.

If you don't want to use any kind of loop, then follow this recursive method:

function removeElement(&$origArr, $arr, $element, $prevKey = null){
    static $flag = false;
    if($flag){
        return;
    }
    if(is_array(current($arr))){
        removeElement($origArr, next($arr), $element, key($arr));
    }else{
        if(current($arr) == $element){
            $flag = true;
            unset($origArr[$prevKey]);
            return;
        }else{
            removeElement($origArr, next($arr), $element, key($arr));
        }
    }
}

// suppose $arr is your original array
removeElement($arr, $arr, 'Bananas');

// display $arr array
var_dump($arr);

Output:

array (size=3)
  0 => 
    array (size=2)
      0 => string 'Apples' (length=6)
      'Query' => string 'Apples' (length=6)
  2 => 
    array (size=2)
      0 => string 'Bananas' (length=7)
      'Query' => string 'Bananas' (length=7)
  3 => 
    array (size=2)
      0 => string 'Oranges' (length=7)
      'Query' => string 'Oranges' (length=7)

Here are the relevant references:

• key()
• current()
• reference
• is_array()

---

Later, if you want to rearrange the indices numerically then use array_values() function, like this:

removeElement($arr, $arr, 'Bananas');

$newArr = array_values($arr);
var_dump($newArr);