此处仅作记录，爱奇艺Web端 k_ft1 算法（php，JS）

 k_ft1参数是控制输出播放地址的形式，如MP4 ,M3U8地址，M3U8 ts内容，这个值其实是可以固定的，这里只是做个学习记录

下面是根据官方新写的

官方源JS 

var Ta = i(86)
      , Sa = i(103)
      , xa = {
        1: {
            3: !0,
            37: !1,
            40: !0,
            42: !0,
            48: !0,
            50: !0
        },
        2: {},
        4: {
            3: !1,
            5: !1,
            27: !0,
            28: !1,
            41: !1
        },
        5: {
            1: !0
        }
    };
    var Pa = {
        getFT1: function() {
            for (var e = [], t = 1; t <= 64; t++)
                e.push(xa[1][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        getFT2: function() {
            for (var e = [], t = 1; t <= 64; t++)
                e.push(xa[2][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        getFT4: function() {
            for (var e = [], t = 1; t <= 64; t++)
                e.push(xa[4][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        getFT5: function() {
            for (var e = [], t = 1; t <= 64; t++)
                e.push(xa[5][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        getM3U8FT1: function() {
            var e = [];
            xa[1][37] = !0,
            xa[1][38] = !0,
            xa[1][50] = !0;
            for (var t = 1; t <= 64; t++)
                e.push(xa[1][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        getMP4FT1: function() {
            var e = [];
            xa[1][45] = !0,
            xa[1][50] = !0;
            for (var t = 1; t <= 64; t++)
                e.push(xa[1][t] ? 1 : 0);
            return parseInt(e.reverse().join(""), 2)
        },
        hasBit: function(e, t) {
            return xa[e][t]
        },
        openBit: function(e, t) {
            xa[e][t] = !0
        },
        closeBit: function(e, t) {
            xa[e][t] = !1
        }
    };

PHP：

$h2_kf_arr = array(
    1=> [3 => !0,37 => !1,40 => !0,42 => !0,48 => !0,50 => !0],
    2=> [],
    4=> [3 => !1,5 => !1,27 => !0,28 => !1,41 => !1],
    5=> [1 => !0],
);

$params['k_ft1_FT1'] = h2_kf_FT1($h2_kf_arr);
$params['k_ft1_mp4'] = h2_kf_mp4($h2_kf_arr);
$params['k_ft1_m3u8'] = h2_kf_m3u8($h2_kf_arr);

$params['k_ft1'] = $params['k_ft1_FT1'];

function h2_kf_FT1($h2_kf_arr=[]) {//flv

    $e = [];
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[1][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}
function h2_kf_FT2($h2_kf_arr=[]) {//flv

    $e = [];
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[2][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}
function h2_kf_FT4($h2_kf_arr=[]) {//flv

    $e = [];
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[4][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}
function h2_kf_FT5($h2_kf_arr=[]) {//flv

    $e = [];
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[5][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}

function h2_kf_mp4($h2_kf_arr=[]) {//mp4

    $e = [];
    $h2_kf_arr[1][45] = !0;
    $h2_kf_arr[1][50] = !0;
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[1][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}
function h2_kf_m3u8($h2_kf_arr=[]) {//m3u8

    $e = [];
    $h2_kf_arr[1][37] = !0;
    $h2_kf_arr[1][38] = !0;
    $h2_kf_arr[1][50] = !0;
    for ($t = 1; $t <= 64; $t++){
        $e[] = $h2_kf_arr[1][$t] ? 1 : 0;
    }
    return intval(implode("",array_reverse($e)),2);
}