PHP

Question

我有一组对象。喜欢下面的代码：

Class fileHeadFootBlock {
        public $offset;
        public $id;
        public $length;
        public $version;
    }

    $FILE_HEADER = array(); // This array contains all file header block constant
    //race1UP file version
    $FH_FILEVER = new fileHeadFootBlock();
    $FH_FILEVER->offset = 18;
    $FH_FILEVER->id = hexdec('FF');
    $FH_FILEVER->length = hexdec('3E');
    $FH_FILEVER->version = 'File ver: v.20120521 beta (gen from matlab)';
    array_push($FILE_HEADER, $FH_FILEVER);
    //race1UP hardware version
    $FH_RERHWVER = new fileHeadFootBlock();
    $FH_RERHWVER->offset = $FH_FILEVER->offset + $FH_FILEVER->length;
    $FH_RERHWVER->id = hexdec('FE');
    $FH_RERHWVER->length = hexdec('60');
    $FH_RERHWVER->version = 'HARDWARE VERSION: v.20120521 beta.';
    array_push($FILE_HEADER, $FH_RERHWVER);

fileHeadFootBlock 类型的对象数组是 $FILE_HEADER

问题如下：使 $FILE_HEADER 保持不变的最佳方法是什么？数组的每个元素及其字段 ($offset, $id. $length, $version) 应该是常量。

此致，亚历克斯

Answer 1

如果你想保留你的数据文件不能更改。您可以将它们设为私有并仅在构造函数中设置。

有例子：

Class fileHeadFootBlock {
    private $offset;
    private $id;
    private $length;
    private $version;

    public function __construct($offset, $id, $length, $version)
    {
        $this->offset = $offset;
        $this->id = $id;
        $this->length = $length;
        $this->version = $version;
    }

    /**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @return mixed
     */
    public function getOffset()
    {
        return $this->offset;
    }

    /**
     * @return mixed
     */
    public function getVersion()
    {
        return $this->version;
    }

    /**
     * @return mixed
     */
    public function getLength()
    {
        return $this->length;
    }
}

$FILE_HEADER = array();
//race1UP file version
$FH_FILEVER = new fileHeadFootBlock(18, 'FF', '3E', 'File ver: v.20120521 beta (gen from matlab)');
array_push($FILE_HEADER, $FH_FILEVER);
//race1UP hardware version
$FH_RERHWVER = new fileHeadFootBlock($FH_FILEVER->getOffset() + $FH_FILEVER->getLength(), 'FE', '60', 'HARDWARE VERSION: v.20120521 beta.');
array_push($FILE_HEADER, $FH_RERHWVER);

PHP - 常量对象数组

PHP - Array of constant objects

constants

object