用PHP将字符串转换为数组

$str = "apple,banana,cherry";
$array = explode(",", $str);
print_r($array);

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

$str = "hello";
$array = str_split($str);
print_r($array);

Array
(
    [0] => h
    [1] => e
    [2] => l
    [3] => l
    [4] => o
)

$str = "one two three four";
$array = preg_split('/\s+/', $str);
print_r($array);

Array
(
    [0] => one
    [1] => two
    [2] => three
    [3] => four
)

$jsonStr = '{"name":"John", "age":30, "city":"New York"}';
$array = json_decode($jsonStr, true);
print_r($array);

Array
(
    [name] => John
    [age] => 30
    [city] => New York
)

$jsonStr = '{"name":"John", "age":30, "city":"New York"'; // 缺少闭合括号
$array = json_decode($jsonStr, true);
if ($array === null) {
    echo "JSON解析错误：" . json_last_error_msg();
}