Question

我试图在这样的类中获取dinamically数据：

Class foo
{
    private $config=array();

    public __construct(){    
        $this->config['site']['title'] = 'XXXXX';
        $this->config['site']['favicon'] = 'XXXXX.ico';
        $this->config['site']['keywords'] = array('page','cute','other');        
        $this->config['otherthing'] = 'value';
        /**etc**/
    }

    public function set($name,$value)
    {
        $tmp = explode('.',$name);
        /** i dont know what i can do here **/
    }

    public function get($name)
    {
        $tmp = explode('.',$name);
        /** i dont know what i can do here **/
    }
}

$thing = new foo;
$this->set('site.keywords',array('other','keywords'));//this change a data inside foo->config['site']['keywords']

echo $this->get('site.title'); // gets data inside foo->config['site']['title']
echo $this->get('otherthing'); // gets data inside foo->config['otherthing']

数组维度可以通过dinamically进行更改，我希望在foo-> gt中设置/检索数据：顺序调用数组：function（fist.second.third.four.etc）。

编辑：

我可以用爆炸创建一个函数，我探索了这个可能性，但如果我使用这样的函数：

function get($name)
{
    $tmp = explode('.',$name);
    if(isset($this->config[$tmp[0]][$tmp[1]]))
        return $this->config[$tmp[0]][$tmp[1]];
    return '';
}

当我需要在3维（$ this-＆gt; config [one] [two] [tree]）或一维（$ this-＆gt; config [one]）中获取数组值时，函数无法处理结果。我想获得数组的N维。

我也试过这个解决方案： function nameToArray（$ name） { $ tmp = explode（'。'，$ name）; $ return ='';

    foreach($tmp as $v)
    {
        $return .= "['{$v}']";

    }

    return 'config'.$return;
}
function set($name,$value)
{
    $this->{$this->nameToArray} = $value;
}

$foo->set('site.favicon','something.ico');

但这不会编辑$ foo-＆gt; config中的数组，这会在$ this中创建一个名为literally config ['site'] ['favicon']的新值。

我不知道我是怎么做到的，我尝试了很多方法，但我不能得到具体的结果。谢谢你的帮助。

Answer 1

使用reference引用数组中最新的已知点，并按每一步更新它：

$ref = &$this->config;
$keys = explode('.', $name);
foreach ($keys as $idx => $key) {
    if (!is_array($ref)) {
        // reference does not refer to an array
        // this is a problem as we still have at least one key to go
    }
    if (!array_key_exists($key, $ref)) {
        // key does not exist
        // reaction depends on the operation
    }
    // update reference
    $ref = &$ref[$key];
}

if分支取决于操作。以下是getter和setter的示例：

public function get($name) {
    $ref = &$this->config;
    $keys = explode('.', $name);
    foreach ($keys as $idx => $key) {
        if (!is_array($ref)) {
            throw new Exception('key "'.implode('.', array_slice($keys, 0, $idx-1)).'" is not an array');
        }
        if (!array_key_exists($key, $ref)) {
            throw new Exception('key "'.implode('.', array_slice($keys, 0, $idx)).'" does not exist');
        }
        $ref = &$ref[$key];
    }
    return $ref;
}
public function set($name, $value) {
    $ref = &$this->config;
    $keys = explode('.', $name);
    foreach ($keys as $idx => $key) {
        if (!is_array($ref)) {
            throw new Exception('key "'.implode('.', array_slice($keys, 0, $idx)).'" is not an array but '.gettype($ref));
        }
        if (!array_key_exists($key, $ref)) {
            $ref[$key] = array();
        }
        $ref = &$ref[$key];
    }
    $ref = $value;
}

Answer 2

我有另一种基于eval的解决方案我只是将字符串与括号

连接起来

<?php
Class foo {
    private $config=array();

    function __construct(){    
        $this->config['site']['title'] = 'testing';
        $this->config['site']['favicon'] = 'XXXXX.ico';
        $this->config['site']['keywords'] = array('page','cute','other');        
        $this->config['otherthing'] = 'value';
        /**etc**/
    }

    public function set($name,$value)
    {
        $tmp = explode('.',$name);
        $array_levels = "['";
        foreach($tmp as $key) {
            $array_levels .= $key."']['";
        }
        $array_levels = substr($array_levels, 0, -2);
        eval('$this->config'.$array_levels.' = $value;');
    }
    public function get($name)
    {
        $tmp = explode('.',$name);
        $array_levels = "['";
        foreach($tmp as $key) {
            $array_levels .= $key."']['";
        }
        $array_levels = substr($array_levels, 0, -2);
        eval('$value = $this->config'.$array_levels.';');
        return $value;
    }
}
$thing = new foo;
$thing->set('site.keywords',array('other','keywords'));
echo $thing->get('site.title');

Answer 3

正如您所见here，函数explode接受字符串并返回一个数组。所以这就是你需要做的事情：

public function set($name,$value)
    {
        $tmp = explode('.',$name); //$tmp will now contain an array, so if $name = 'site.keywords'
                                   //$tmp[0] will contain 'site' and $tmp[1] = 'keywords'
        //if you send 'otherthing' as $name, then $tmp[1] will have no value
        if(isset($tmp[1])){
                $this->config[$tmp[0]][$tmp[1]] = $value; // this is like saying  $this-config['site']['keywords'] = $value
        }
        else{
            $this->config[$tmp[0]] = $value; 
        }
    }

对于获取：

public function get($name)
    {
        $tmp = explode('.',$name);
        if(isset($tmp[1])){
            return $this->config[$tmp[0]][$tmp[1]];
        }
        else{
           return $this->config[$tmp[0]];
        }

    }

获取/设置多维数组数据的函数，如getData（'my.multi.array'）

3 个答案: