object scalar string

Scalar.php

<?php

class Str
{
    private $str;
    
    public function __construct(string $str)
    {
        $this->str = $str;
    }
    
    public function replace($a, $b)
    {
        $this->str = str_replace($a, $b, $this->str);
        return $this;
    }
    
    public function ireplace($a, $b)
    {
        $this->str = str_ireplace($a, $b, $this->str);
        return $this;
    }
    
    public function toUpper()
    {
        $this->str = strtoupper($this->str);
        return $this;
    }
    
    public function toLower()
    {
        $this->str = strtolower($this->str);
        return $this;
    }
    
    public function append($str)
    {
        $this->str .= $str;
        return $this;
    }
    
    public function prepend($str)
    {
        $this->str = $str . $this->str;
        return $this;
    }
    
    public function trim()
    {
        $this->str = trim($this->str);
        return $this;
    }
    
    public function pregReplace($preg, $str)
    {
        $this->str = preg_replace($preg, $str, $this->str);
    }
    
    public function get()
    {
        return $this->str;
    }
    
    public function __toString()
    {
        return $this->str;
    }
}

$str = (string) (new Str('Hello World'))
    ->toUpper()
    ->ireplace('world', '')
    ->trim()
    ->append('!')
;


echo $str; // HELLO!