php 7 array functions

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Okay, let's dive deep into PHP 7 array functions. I'll provide a comprehensive tutorial with explanations, examples, and considerations. We'll cover a wide range of frequently used and powerful functions.

**Introduction to PHP Arrays**

Before we get into the functions, let's briefly recap what PHP arrays are:

* **Ordered Maps:** PHP arrays are fundamentally ordered maps. This means they're associative arrays, storing key-value pairs. Keys can be integers or strings, and values can be of any data type (including other arrays, creating multi-dimensional arrays).
* **Dynamic:** PHP arrays are dynamically sized. You don't need to declare a fixed size upfront.
* **Flexible:** You can mix and match different data types within the same array.

**Basic Array Creation and Access**
**Key Array Functions**

Now, let's explore the key array functions, grouped by category for better understanding.

**1. Basic Array Manipulation**

* **`array_push(array &$array, mixed ...$values): int`:** Adds one or more elements to the *end* of the array. The array is passed by reference, so it's modified directly. Returns the new number of elements in the array.



* **`array_pop(array &$array): mixed`:** Removes and returns the *last* element of the array, shortening the array by one element. If the array is empty, it returns `NULL`.



* **`array_unshift(array &$array, mixed ...$values): int`:** Adds one or more elements to the *beginning* of the array. The array's keys are renumbered. Returns the new number of elements in the array.



* **`array_shift(array &$array): mixed`:** Removes and returns the *first* element of the array, renumbering all subsequent keys. If the array is empty, it returns `NULL`.



* **`unset(mixed $var, mixed ...$vars): void`:** While not strictly an array function, `unset()` is crucial for removing elements from an array by their key. You can unset multiple variables or array elements at once.



* **`array_spli ...

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