function ARC4_init($key = '')
    {
        $this->arc4 = '';

        // setup the control array
        if (mb_strlen($key, '8bit') == 0) {
            return;
        }

        $k = '';
        while (mb_strlen($k, '8bit') < 256) {
            $k .= $key;
        }

        $k = substr($k, 0, 256);
        for ($i = 0; $i < 256; $i++) {
            $this->arc4 .= chr($i);
        }

        $j = 0;

        for ($i = 0; $i < 256; $i++) {
            $t = $this->arc4[$i];
            $j = ($j + ord($t) + ord($k[$i])) % 256;
            $this->arc4[$i] = $this->arc4[$j];
            $this->arc4[$j] = $t;
        }
    }
function ARC4_init($key = '')
    {
        $this->arc4 = '';

        // setup the control array
        if (mb_strlen($key, '8bit') == 0) {
            return;
        }

        $k = '';
        while (mb_strlen($k, '8bit') < 256) {
            $k .= $key;
        }

        $k = substr($k, 0, 256);
        for ($i = 0; $i < 256; $i++) {
            $this->arc4 .= chr($i);
        }

        $j = 0;

        for ($i = 0; $i < 256; $i++) {
            $t = $this->arc4[$i];
            $j = ($j + ord($t) + ord($k[$i])) % 256;
            $this->arc4[$i] = $this->arc4[$j];
            $this->arc4[$j] = $t;
        }
    }
function ARC4_init ( $ key = '' ) { $ this -> arc4 = '' ; // setup the control array if ( mb_strlen ( $ key , '8bit' ) == 0 ) { return ; } $ k = '' ; while ( mb_strlen ( $ k , '8bit' ) < 256 ) { $ k .= $ key ; } $ k = substr ( $ k , 0 , 256 ) ; for ( $ i = 0 ; $ i < 256 ; $ i ++ ) { $ this -> arc4 .= chr ( $ i ) ; } $ j = 0 ; for ( $ i = 0 ; $ i < 256 ; $ i ++ ) { $ t = $ this -> arc4 [ $ i ] ; $ j = ( $ j + ord ( $ t ) + ord ( $ k [ $ i ] ) ) % 256 ; $ this -> arc4 [ $ i ] = $ this -> arc4 [ $ j ] ; $ this -> arc4 [ $ j ] = $ t ; } }
initialize the ARC4 encryption

@param string $key
initialize the ARC4 encryption