字符串转数组时如何保留原格式？PHP中的格式化处理方法

explode()

$csvString = "Apple,Banana,Orange";
$fruits = explode(',', $csvString);
// $fruits 现在是 ['Apple', 'Banana', 'Orange']，结构被保留了

str_split()

preg_split()

str_split()

preg_split()

json_decode()

unserialize()

$jsonString = '{"name":"Alice","age":30,"hobbies":["reading","hiking"]}';
$data = json_decode($jsonString, true); // true表示返回关联数组
// $data 现在是一个包含 name, age, hobbies 的关联数组，原JSON结构完全还原

explode()

explode()

array_map()

$dataString = "1,2,3,42.5,true,false,hello";
$stringArray = explode(',', $dataString); // ['1', '2', '3', '42.5', 'true', 'false', 'hello']

// 转换为整数数组 (只适用于纯数字字符串)
$intArray = array_map('intval', $stringArray); 
// $intArray 会是 [1, 2, 3, 42, 0, 0, 0] - 注意 '42.5' 变成 42, 'true' 'false' 'hello' 变成 0

// 更灵活的类型转换，需要自定义一个回调函数
$typedArray = array_map(function($item) {
    if (is_numeric($item)) {
        // 检查是否为浮点数
        if (strpos($item, '.') !== false) {
            return (float)$item;
        }
        return (int)$item;
    }
    if (strtolower($item) === 'true') {
        return true;
    }
    if (strtolower($item) === 'false') {
        return false;
    }
    return $item; // 保持原样，或根据需要抛出错误/返回null
}, $stringArray);

/*
$typedArray 结果可能像这样：
[1, 2, 3, 42.5, true, false, 'hello']
*/

serialize()

json_decode()

unserialize()

json_decode()

$jsonString = '{"user_id":123,"username":"JaneDoe","settings":{"theme":"dark","notifications":true},"tags":["php","webdev"]}';

// 默认返回对象
$objectData = json_decode($jsonString);
// $objectData->user_id 是 123

// 返回关联数组，这是我个人在多数场景下更偏爱的做法
$arrayData = json_decode($jsonString, true); 
// $arrayData['user_id'] 是 123， $arrayData['settings']['theme'] 是 'dark'

true

json_decode()

serialize()

unserialize()

$originalArray = ['name' => 'Alice', 'age' => 30, 'hobbies' => ['coding', 'reading']];
$serializedString = serialize($originalArray);
// $serializedString 可能是类似 "a:3:{s:4:"name";s:5:"Alice";s:3:"age";i:30;s:7:"hobbies";a:2:{i:0;s:6:"coding";i:1;s:7:"reading";}}"

$restoredArray = unserialize($serializedString);
// $restoredArray 完美还原了 $originalArray 的结构和数据

json_decode()

null

json_last_error()

json_last_error_msg()

unserialize()

false

E_NOTICE

\UnexpectedValueException

preg_split()

$complexString = "ItemA;Value1,Value2|ItemB";
$parts = preg_split('/[;,\|]/', $complexString);
// $parts 会是 ['ItemA', 'Value1', 'Value2', 'ItemB']

preg_split()

explode()

substr()

$fixedWidthString = "John   Doe     30Male"; // 假设姓名10字符，年龄3字符，性别4字符
$name = trim(substr($fixedWidthString, 0, 10)); // John
$lastName = trim(substr($fixedWidthString, 10, 5)); // Doe
$age = (int)trim(substr($fixedWidthString, 15, 3)); // 30
$gender = trim(substr($fixedWidthString, 18, 4)); // Male

$dataArray = [
    'name' => $name,
    'lastName' => $lastName,
    'age' => $age,
    'gender' => $gender
];
// $dataArray 会是 ['name' => 'John', 'lastName' => 'Doe', 'age' => 30, 'gender' => 'Male']