PHP三种方式实现链式操作

strlen(trim($str))

$str->trim()->strlen()

<?php
class StringHelper 
{
    private $value;
    
    function __construct($value)
    {
        $this->value = $value;
    }
    function __call($function, $args){
        $this->value = call_user_func($function, $this->value, $args[0]);
        return $this;
    }
    function strlen() {
        return strlen($this->value);
    }
}
$str = new StringHelper("  sd f  0");
echo $str->trim(&#39;0&#39;)->strlen();

php test.php 
8

<?php
class StringHelper 
{
    private $value;
    
    function __construct($value)
    {
        $this->value = $value;
    }
    function __call($function, $args){
        array_unshift($args, $this->value);
        $this->value = call_user_func_array($function, $args);
        return $this;
    }
    function strlen() {
        return strlen($this->value);
    }
}
$str = new StringHelper("  sd f  0");
echo $str->trim(&#39;0&#39;)->strlen();

array_unshift(array,value1,value2,value3...)

public function trim($t)
{
    $this->value = trim($this->value, $t);
    return $this;
}