PHP 배열 함수에 대한 자세한 설명 및 예제 시연

$array1 = array('red', 'green');
$array2 = array('blue', 'yellow');
$mergedArray = array_merge($array1, $array2);

print_r($mergedArray);

Array
(
    [0] => red
    [1] => green
    [2] => blue
    [3] => yellow
)

$fruits = array('apple', 'banana');
array_push($fruits, 'orange', 'grape');

print_r($fruits);

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => grape
)

$numbers = array(1, 2, 3, 4);
$lastNumber = array_pop($numbers);

print_r($numbers);
echo $lastNumber;

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)
4

### 4. array_keys()

`array_keys()`函数返回数组中所有的键名。

[0] => name
[1] => age
[2] => grade

### 5. array_values()

`array_values()`函数返回数组中所有的值。

[0] => Alice
[1] => 20
[2] => A