Question

我在一个班级中有几种方法。第一种方法是查询数据。

public function queryData() { 
    if ($this->result) {
        return $this->result;
    }
    $url = 'http://domain.com/cgi-bin/cgi.exe';
    $data = array('var1' => 'value1', 'var2' => 'value2');
    $options = array(
        'http' => array(
            'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
            'method'  => 'POST',
            'content' => http_build_query($data),
        ),
    );
    $context  = stream_context_create($options);
    $this->result = explode("\n",file_get_contents($url, false, $context));
            array_pop($this->result);
    return $this->result;
}

然后我需要将这个$ result传递给其他方法：

public function method1() {
   $this->result = $this->queryData();
   $data1 = explode(":",$this->result);
   return $data1;
}

public function method2() {
   $this->result = $this->queryData();
   $data2 = explode(",",$this->result);
   return $data2;
}

如果我这样做，脚本将多次查询数据。如何有效地使用一个查询然后将$ result传递给其他方法？

Answer 1

将结果存储在类变量中，只有在尚未设置的情况下才执行查询。

class myClass {

    private $result = null;

    public function queryData() { 

        if ($this->result) {
            return $this->result;
        }

        $url = 'http://domain.com/cgi-bin/cgi.exe';
        $data = array('var1' => 'value1', 'var2' => 'value2');
        $options = array(
            'http' => array(
                'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                'method'  => 'POST',
                'content' => http_build_query($data),
            ),
        );
        $context  = stream_context_create($options);
        $this0->$result = file_get_contents($url, false, $context);
        return $this->$result;
    }

...
}

如何有效地构建这些方法？

1 个答案: