src/Str.php
public function append(string $string): self
    {
        return new self((string) $this.$string, $this->encoding);
    }
public function append(string $string): self
    {
        return new self((string) $this.$string, $this->encoding);
    }
public function append ( string $ string ) : self { return new self ( ( string ) $ this . $ string , $ this -> encoding ) ; }
Append a string at the end of the current one

@param string $string

@return self
Append a string at the end of the current one