src/Strings/Strings.php
public function concat($string, $prepend = false)
    {
        $this->string = $prepend ? (string) $string . $this->string : $this->string . (string) $string;

        return $this;
    }
public function concat($string, $prepend = false)
    {
        $this->string = $prepend ? (string) $string . $this->string : $this->string . (string) $string;

        return $this;
    }
public function concat ( $ string , $ prepend = false ) { $ this -> string = $ prepend ? ( string ) $ string . $ this -> string : $ this -> string . ( string ) $ string ; return $ this ; }
Concat string with current string.

@param  string $string String to concat
@param  bool   $prepend Boolean
@return self
Concat string with current string .