php chain call

strlen (strim ($str))This is a function to get the length of a string. How to write it as a chain operation?

<code>$str -> trim() -> strlen()</code>

Tips:

First implement a String class. When the object of this class is called and processed, the __call magic method is triggered, and then call_user_func is executed

Reply content:

strlen (strim ($str))This is a function to get the length of a string. How to write it as a chain operation?

<code>$str -> trim() -> strlen()</code>

Tips:

First implement a String class. When the object of this class is called and processed, the __call magic method is triggered, and then call_user_func is executed

The source code is as follows

<code class="php"><?php
/**
 * 字符串处理
 *
 * @author Flc <2016-08-04 23:39:41>
 * @link http://flc.ren
 */
class Str
{
    /**
     * 字符串
     * @var [type]
     */
    protected $string;

    /**
     * 支持的函数
     * @var array
     */
    protected $methods = ['trim', 'strlen'];

    /**
     * 初始化
     * @param [type] $string [description]
     */
    public function __construct($string)
    {
        $this->string = $string;
    }

    /**
     * 单例模式
     * @param  string $string 字符串
     * @return Object:Str         
     */
    public static function getInstance($string)
    {
        static $_instances = [];

        if (isset($_instances[$string]))
            return $_instances[$string];

        return $_instances[$string] = new self($string);
    }

    /**
     * 输出
     * @return string 
     */
    public function response()
    {
        return $this->string;
    }

    /**
     * 模式方法
     * @param  string $method 方法
     * @return Object:Str         
     */
    public function __call($method, $args)
    {
        if (in_array($method, $this->methods)) {
            if (function_exists($method)) {
                $this->string = call_user_func($method, $this->string);
            }
        }

        return $this;
    }
}

// DEMO
echo Str::getInstance(' 123123 123')->trim()->strlen()->response();
?></code>

<code><?php
/**
 * Created by PhpStorm.
 * User: hongxu
 * Date: 16/8/4
 * Time: 13:21
 */

class str {

    private $str = '';

    /**
     * str constructor.
     */
    public function __construct($str) {

        $this->str = $str;
    }

    public function trim() {
        $this->str = trim($this->str);
        return $this;
    }

    public function strlen() {
        return strlen($this->str);
    }
}

$str = new str('要思考,不做伸手党');

var_dump($str->trim()->strlen());die;</code>

output:

<code>php test.php
int(25)
</code>

<code class="php"><?php
class Str {
    private $value = '';

    public function __construct($str) {
        $this->value = $str;
    }

    public function __call($name, $args) {
        if (function_exists($name)) {
            array_unshift($args, $this->value);
            $value = call_user_func_array($name, $args);
            if (is_string($value)) {
                return new static($value);
            } else {
                return $value;
            }
        }
    }

    public function __toString() {
        return $this->value;
    }
}

$str = new Str('  题主是不是个伸手党?  ');

echo($str->trim() . PHP_EOL);
echo($str->trim()->strlen() . PHP_EOL);
$trim_str = $str->trim();
echo($trim_str->substr(0, $trim_str->strlen() - 1) . PHP_EOL);</code>

<code>题主是不是个伸手党?
28
题主是不是个伸手党</code>

It is not difficult to implement such a function, you only need to encapsulate the string. If chain calls are needed, just return $this.
Please see the following code to realize your function:

<code><?php
//演示链式调用

class MyString{
    private $string;
    
    function MyString($str){
        $this->string=$str;
    }
    
    function len(){
        return strlen($this->string);
    }
    
    function _trim(){
        $this->string=trim($this->string);
        return $this;
    }
}

$d=new MyString(' sdfsdf  ');
echo $d->_trim()->len();
?></code>

->Why do you need spaces ==, it looks so strange