> For the complete documentation index, see [llms.txt](https://arrayutils.docs.present.kim/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://arrayutils.docs.present.kim/methods/g/find/index.md).

# findIndex()

{% code title="Example.php" %}

```php
<?php use kim\present\utils\arrays\ArrayUtils;

$arrayUtils = ArrayUtils::from(["Apple", "Banana", "Carrot", "Bacon"]);

//Find value's index ​​starting with B
$arrayUtils->findIndex(function($name){ return $name[0] === "B"; });
// expected output: 1
```

{% endcode %}

## Syntax

```php
$arrayUtils->find(callable $callback) : mixed;
```

### Parameter

* `$callback`

  > A function to execute on each value in the array, taking 3 arguments:
  >
  > * `$value` The current element being processed in the array.
  > * `$key` The index of the current element being processed in the array.
  > * `$array`  The array `every` was called upon.

### Return value

* The **key** of the **first element** in the array that pass function.\
  Otherwise, `NULL` is returned.

## Prefixing

```php
ArrayUtils::findFrom(iterable $from, callable $callback) : mixed;
```

## References

<https://www.php.net/manual/en/function.array-chunk>