php 数组追加

$array = [];
$array[] = 'apple';
$array[] = 'banana';
print_r($array);

Array
(
    [0] => apple
    [1] => banana
)

$array = [];
array_push($array, 'apple');
array_push($array, 'banana');
print_r($array);

Array
(
    [0] => apple
    [1] => banana
)

$array1 = ['apple'];
$array2 = ['banana'];
$result = array_merge($array1, $array2);
print_r($result);

Array
(
    [0] => apple
    [1] => banana
)

$array1 = ['a' => 'apple'];
$array2 = ['b' => 'banana'];
$result = array_merge($array1, $array2);
print_r($result);

Array
(
    [a] => apple
    [b] => banana
)

$array = ['apple'];
$newElement = 'banana';
if (!in_array($newElement, $array)) {
    $array[] = $newElement;
}
print_r($array);

Array
(
    [0] => apple
    [1] => banana
)