PHP의 사인파 데이터 배열에서 고점 및 저점을 얻는 방법

Question

이것은 예제 배열입니다. 두 사이클의 값을 얻으려고합니다. 예를 들어이 배열은 키 21과 143을 가장 낮은 값으로, 80과 204를 가장 높은 값으로 반환합니다.

Array 
(
    [0] => Array 
     (
      [t] => 2016-08-31 00:00 
      [v] => 1.443 
     ) 

    [1] => Array 
     (
      [t] => 2016-08-31 00:06 
      [v] => 1.319 
     ) 

    [2] => Array 
     (
      [t] => 2016-08-31 00:12 
      [v] => 1.199 
     ) 

    [3] => Array 
     (
      [t] => 2016-08-31 00:18 
      [v] => 1.082 
     ) 

    [4] => Array 
     (
      [t] => 2016-08-31 00:24 
      [v] => 0.969 
     ) 

    [5] => Array 
     (
      [t] => 2016-08-31 00:30 
      [v] => 0.861 
     ) 

    [6] => Array 
     (
      [t] => 2016-08-31 00:36 
      [v] => 0.757 
     ) 

    [7] => Array 
     (
      [t] => 2016-08-31 00:42 
      [v] => 0.658 
     ) 

    [8] => Array 
     (
      [t] => 2016-08-31 00:48 
      [v] => 0.565 
     ) 

    [9] => Array 
     (
      [t] => 2016-08-31 00:54 
      [v] => 0.477 
     ) 

    [10] => Array 
     (
      [t] => 2016-08-31 01:00 
      [v] => 0.395 
     ) 

    [11] => Array 
     (
      [t] => 2016-08-31 01:06 
      [v] => 0.320 
     ) 

    [12] => Array 
     (
      [t] => 2016-08-31 01:12 
      [v] => 0.251 
     ) 

    [13] => Array 
     (
      [t] => 2016-08-31 01:18 
      [v] => 0.190 
     ) 

    [14] => Array 
     (
      [t] => 2016-08-31 01:24 
      [v] => 0.135 
     ) 

    [15] => Array 
     (
      [t] => 2016-08-31 01:30 
      [v] => 0.088 
     ) 

    [16] => Array 
     (
      [t] => 2016-08-31 01:36 
      [v] => 0.049 
     ) 

    [17] => Array 
     (
      [t] => 2016-08-31 01:42 
      [v] => 0.017 
     ) 

    [18] => Array 
     (
      [t] => 2016-08-31 01:48 
      [v] => -0.007 
     ) 

    [19] => Array 
     (
      [t] => 2016-08-31 01:54 
      [v] => -0.023 
     ) 

    [20] => Array 
     (
      [t] => 2016-08-31 02:00 
      [v] => -0.031 
     ) 

    [21] => Array 
     (
      [t] => 2016-08-31 02:06 
      [v] => -0.031 
     ) 

    [22] => Array 
     (
      [t] => 2016-08-31 02:12 
      [v] => -0.024 
     ) 

    [23] => Array 
     (
      [t] => 2016-08-31 02:18 
      [v] => -0.008 
     ) 

    [24] => Array 
     (
      [t] => 2016-08-31 02:24 
      [v] => 0.015 
     ) 

    [25] => Array 
     (
      [t] => 2016-08-31 02:30 
      [v] => 0.046 
     ) 

    [26] => Array 
     (
      [t] => 2016-08-31 02:36 
      [v] => 0.084 
     ) 

    [27] => Array 
     (
      [t] => 2016-08-31 02:42 
      [v] => 0.129 
     ) 

    [28] => Array 
     (
      [t] => 2016-08-31 02:48 
      [v] => 0.181 
     ) 

    [29] => Array 
     (
      [t] => 2016-08-31 02:54 
      [v] => 0.240 
     ) 

    [30] => Array 
     (
      [t] => 2016-08-31 03:00 
      [v] => 0.305 
     ) 

    [31] => Array 
     (
      [t] => 2016-08-31 03:06 
      [v] => 0.377 
     ) 

    [32] => Array 
     (
      [t] => 2016-08-31 03:12 
      [v] => 0.454 
     ) 

    [33] => Array 
     (
      [t] => 2016-08-31 03:18 
      [v] => 0.537 
     ) 

    [34] => Array 
     (
      [t] => 2016-08-31 03:24 
      [v] => 0.625 
     ) 

    [35] => Array 
     (
      [t] => 2016-08-31 03:30 
      [v] => 0.718 
     ) 

    [36] => Array 
     (
      [t] => 2016-08-31 03:36 
      [v] => 0.816 
     ) 

    [37] => Array 
     (
      [t] => 2016-08-31 03:42 
      [v] => 0.919 
     ) 

    [38] => Array 
     (
      [t] => 2016-08-31 03:48 
      [v] => 1.025 
     ) 

    [39] => Array 
     (
      [t] => 2016-08-31 03:54 
      [v] => 1.136 
     ) 

    [40] => Array 
     (
      [t] => 2016-08-31 04:00 
      [v] => 1.251 
     ) 

    [41] => Array 
     (
      [t] => 2016-08-31 04:06 
      [v] => 1.370 
     ) 

    [42] => Array 
     (
      [t] => 2016-08-31 04:12 
      [v] => 1.492 
     ) 

    [43] => Array 
     (
      [t] => 2016-08-31 04:18 
      [v] => 1.617 
     ) 

    [44] => Array 
     (
      [t] => 2016-08-31 04:24 
      [v] => 1.746 
     ) 

    [45] => Array 
     (
      [t] => 2016-08-31 04:30 
      [v] => 1.877 
     ) 

    [46] => Array 
     (
      [t] => 2016-08-31 04:36 
      [v] => 2.010 
     ) 

    [47] => Array 
     (
      [t] => 2016-08-31 04:42 
      [v] => 2.146 
     ) 

    [48] => Array 
     (
      [t] => 2016-08-31 04:48 
      [v] => 2.284 
     ) 

    [49] => Array 
     (
      [t] => 2016-08-31 04:54 
      [v] => 2.424 
     ) 

    [50] => Array 
     (
      [t] => 2016-08-31 05:00 
      [v] => 2.566 
     ) 

    [51] => Array 
     (
      [t] => 2016-08-31 05:06 
      [v] => 2.708 
     ) 

    [52] => Array 
     (
      [t] => 2016-08-31 05:12 
      [v] => 2.851 
     ) 

    [53] => Array 
     (
      [t] => 2016-08-31 05:18 
      [v] => 2.995 
     ) 

    [54] => Array 
     (
      [t] => 2016-08-31 05:24 
      [v] => 3.139 
     ) 

    [55] => Array 
     (
      [t] => 2016-08-31 05:30 
      [v] => 3.282 
     ) 

    [56] => Array 
     (
      [t] => 2016-08-31 05:36 
      [v] => 3.425 
     ) 

    [57] => Array 
     (
      [t] => 2016-08-31 05:42 
      [v] => 3.566 
     ) 

    [58] => Array 
     (
      [t] => 2016-08-31 05:48 
      [v] => 3.705 
     ) 

    [59] => Array 
     (
      [t] => 2016-08-31 05:54 
      [v] => 3.842 
     ) 

    [60] => Array 
     (
      [t] => 2016-08-31 06:00 
      [v] => 3.977 
     ) 

    [61] => Array 
     (
      [t] => 2016-08-31 06:06 
      [v] => 4.108 
     ) 

    [62] => Array 
     (
      [t] => 2016-08-31 06:12 
      [v] => 4.236 
     ) 

    [63] => Array 
     (
      [t] => 2016-08-31 06:18 
      [v] => 4.359 
     ) 

    [64] => Array 
     (
      [t] => 2016-08-31 06:24 
      [v] => 4.478 
     ) 

    [65] => Array 
     (
      [t] => 2016-08-31 06:30 
      [v] => 4.592 
     ) 

    [66] => Array 
     (
      [t] => 2016-08-31 06:36 
      [v] => 4.700 
     ) 

    [67] => Array 
     (
      [t] => 2016-08-31 06:42 
      [v] => 4.802 
     ) 

    [68] => Array 
     (
      [t] => 2016-08-31 06:48 
      [v] => 4.898 
     ) 

    [69] => Array 
     (
      [t] => 2016-08-31 06:54 
      [v] => 4.988 
     ) 

    [70] => Array 
     (
      [t] => 2016-08-31 07:00 
      [v] => 5.070 
     ) 

    [71] => Array 
     (
      [t] => 2016-08-31 07:06 
      [v] => 5.145 
     ) 

    [72] => Array 
     (
      [t] => 2016-08-31 07:12 
      [v] => 5.213 
     ) 

    [73] => Array 
     (
      [t] => 2016-08-31 07:18 
      [v] => 5.273 
     ) 

    [74] => Array 
     (
      [t] => 2016-08-31 07:24 
      [v] => 5.325 
     ) 

    [75] => Array 
     (
      [t] => 2016-08-31 07:30 
      [v] => 5.370 
     ) 

    [76] => Array 
     (
      [t] => 2016-08-31 07:36 
      [v] => 5.406 
     ) 

    [77] => Array 
     (
      [t] => 2016-08-31 07:42 
      [v] => 5.434 
     ) 

    [78] => Array 
     (
      [t] => 2016-08-31 07:48 
      [v] => 5.454 
     ) 

    [79] => Array 
     (
      [t] => 2016-08-31 07:54 
      [v] => 5.467 
     ) 

    [80] => Array 
     (
      [t] => 2016-08-31 08:00 
      [v] => 5.471 
     ) 

    [81] => Array 
     (
      [t] => 2016-08-31 08:06 
      [v] => 5.467 
     ) 

    [82] => Array 
     (
      [t] => 2016-08-31 08:12 
      [v] => 5.455 
     ) 

    [83] => Array 
     (
      [t] => 2016-08-31 08:18 
      [v] => 5.436 
     ) 

    [84] => Array 
     (
      [t] => 2016-08-31 08:24 
      [v] => 5.409 
     ) 

    [85] => Array 
     (
      [t] => 2016-08-31 08:30 
      [v] => 5.375 
     ) 

    [86] => Array 
     (
      [t] => 2016-08-31 08:36 
      [v] => 5.334 
     ) 

    [87] => Array 
     (
      [t] => 2016-08-31 08:42 
      [v] => 5.285 
     ) 

    [88] => Array 
     (
      [t] => 2016-08-31 08:48 
      [v] => 5.230 
     ) 

    [89] => Array 
     (
      [t] => 2016-08-31 08:54 
      [v] => 5.169 
     ) 

    [90] => Array 
     (
      [t] => 2016-08-31 09:00 
      [v] => 5.101 
     ) 

    [91] => Array 
     (
      [t] => 2016-08-31 09:06 
      [v] => 5.027 
     ) 

    [92] => Array 
     (
      [t] => 2016-08-31 09:12 
      [v] => 4.947 
     ) 

    [93] => Array 
     (
      [t] => 2016-08-31 09:18 
      [v] => 4.862 
     ) 

    [94] => Array 
     (
      [t] => 2016-08-31 09:24 
      [v] => 4.771 
     ) 

    [95] => Array 
     (
      [t] => 2016-08-31 09:30 
      [v] => 4.675 
     ) 

    [96] => Array 
     (
      [t] => 2016-08-31 09:36 
      [v] => 4.575 
     ) 

    [97] => Array 
     (
      [t] => 2016-08-31 09:42 
      [v] => 4.471 
     ) 

    [98] => Array 
     (
      [t] => 2016-08-31 09:48 
      [v] => 4.362 
     ) 

    [99] => Array 
     (
      [t] => 2016-08-31 09:54 
      [v] => 4.250 
     ) 

    [100] => Array 
     (
      [t] => 2016-08-31 10:00 
      [v] => 4.134 
     ) 

    [101] => Array 
     (
      [t] => 2016-08-31 10:06 
      [v] => 4.015 
     ) 

    [102] => Array 
     (
      [t] => 2016-08-31 10:12 
      [v] => 3.893 
     ) 

    [103] => Array 
     (
      [t] => 2016-08-31 10:18 
      [v] => 3.768 
     ) 

    [104] => Array 
     (
      [t] => 2016-08-31 10:24 
      [v] => 3.642 
     ) 

    [105] => Array 
     (
      [t] => 2016-08-31 10:30 
      [v] => 3.513 
     ) 

    [106] => Array 
     (
      [t] => 2016-08-31 10:36 
      [v] => 3.383 
     ) 

    [107] => Array 
     (
      [t] => 2016-08-31 10:42 
      [v] => 3.251 
     ) 

    [108] => Array 
     (
      [t] => 2016-08-31 10:48 
      [v] => 3.119 
     ) 

    [109] => Array 
     (
      [t] => 2016-08-31 10:54 
      [v] => 2.986 
     ) 

    [110] => Array 
     (
      [t] => 2016-08-31 11:00 
      [v] => 2.852 
     ) 

    [111] => Array 
     (
      [t] => 2016-08-31 11:06 
      [v] => 2.718 
     ) 

    [112] => Array 
     (
      [t] => 2016-08-31 11:12 
      [v] => 2.584 
     ) 

    [113] => Array 
     (
      [t] => 2016-08-31 11:18 
      [v] => 2.450 
     ) 

    [114] => Array 
     (
      [t] => 2016-08-31 11:24 
      [v] => 2.317 
     ) 

    [115] => Array 
     (
      [t] => 2016-08-31 11:30 
      [v] => 2.185 
     ) 

    [116] => Array 
     (
      [t] => 2016-08-31 11:36 
      [v] => 2.054 
     ) 

    [117] => Array 
     (
      [t] => 2016-08-31 11:42 
      [v] => 1.924 
     ) 

    [118] => Array 
     (
      [t] => 2016-08-31 11:48 
      [v] => 1.796 
     ) 

    [119] => Array 
     (
      [t] => 2016-08-31 11:54 
      [v] => 1.669 
     ) 

    [120] => Array 
     (
      [t] => 2016-08-31 12:00 
      [v] => 1.545 
     ) 

    [121] => Array 
     (
      [t] => 2016-08-31 12:06 
      [v] => 1.423 
     ) 

    [122] => Array 
     (
      [t] => 2016-08-31 12:12 
      [v] => 1.303 
     ) 

    [123] => Array 
     (
      [t] => 2016-08-31 12:18 
      [v] => 1.186 
     ) 

    [124] => Array 
     (
      [t] => 2016-08-31 12:24 
      [v] => 1.073 
     ) 

    [125] => Array 
     (
      [t] => 2016-08-31 12:30 
      [v] => 0.963 
     ) 

    [126] => Array 
     (
      [t] => 2016-08-31 12:36 
      [v] => 0.856 
     ) 

    [127] => Array 
     (
      [t] => 2016-08-31 12:42 
      [v] => 0.754 
     ) 

    [128] => Array 
     (
      [t] => 2016-08-31 12:48 
      [v] => 0.656 
     ) 

    [129] => Array 
     (
      [t] => 2016-08-31 12:54 
      [v] => 0.563 
     ) 

    [130] => Array 
     (
      [t] => 2016-08-31 13:00 
      [v] => 0.474 
     ) 

    [131] => Array 
     (
      [t] => 2016-08-31 13:06 
      [v] => 0.391 
     ) 

    [132] => Array 
     (
      [t] => 2016-08-31 13:12 
      [v] => 0.314 
     ) 

    [133] => Array 
     (
      [t] => 2016-08-31 13:18 
      [v] => 0.242 
     ) 

    [134] => Array 
     (
      [t] => 2016-08-31 13:24 
      [v] => 0.177 
     ) 

    [135] => Array 
     (
      [t] => 2016-08-31 13:30 
      [v] => 0.118 
     ) 

    [136] => Array 
     (
      [t] => 2016-08-31 13:36 
      [v] => 0.066 
     ) 

    [137] => Array 
     (
      [t] => 2016-08-31 13:42 
      [v] => 0.021 
     ) 

    [138] => Array 
     (
      [t] => 2016-08-31 13:48 
      [v] => -0.016 
     ) 

    [139] => Array 
     (
      [t] => 2016-08-31 13:54 
      [v] => -0.047 
     ) 

    [140] => Array 
     (
      [t] => 2016-08-31 14:00 
      [v] => -0.069 
     ) 

    [141] => Array 
     (
      [t] => 2016-08-31 14:06 
      [v] => -0.084 
     ) 

    [142] => Array 
     (
      [t] => 2016-08-31 14:12 
      [v] => -0.091 
     ) 

    [143] => Array 
     (
      [t] => 2016-08-31 14:18 
      [v] => -0.091 
     ) 

    [144] => Array 
     (
      [t] => 2016-08-31 14:24 
      [v] => -0.082 
     ) 

    [145] => Array 
     (
      [t] => 2016-08-31 14:30 
      [v] => -0.066 
     ) 

    [146] => Array 
     (
      [t] => 2016-08-31 14:36 
      [v] => -0.041 
     ) 

    [147] => Array 
     (
      [t] => 2016-08-31 14:42 
      [v] => -0.009 
     ) 

    [148] => Array 
     (
      [t] => 2016-08-31 14:48 
      [v] => 0.030 
     ) 

    [149] => Array 
     (
      [t] => 2016-08-31 14:54 
      [v] => 0.077 
     ) 

    [150] => Array 
     (
      [t] => 2016-08-31 15:00 
      [v] => 0.131 
     ) 

    [151] => Array 
     (
      [t] => 2016-08-31 15:06 
      [v] => 0.192 
     ) 

    [152] => Array 
     (
      [t] => 2016-08-31 15:12 
      [v] => 0.260 
     ) 

    [153] => Array 
     (
      [t] => 2016-08-31 15:18 
      [v] => 0.334 
     ) 

    [154] => Array 
     (
      [t] => 2016-08-31 15:24 
      [v] => 0.415 
     ) 

    [155] => Array 
     (
      [t] => 2016-08-31 15:30 
      [v] => 0.502 
     ) 

    [156] => Array 
     (
      [t] => 2016-08-31 15:36 
      [v] => 0.594 
     ) 

    [157] => Array 
     (
      [t] => 2016-08-31 15:42 
      [v] => 0.692 
     ) 

    [158] => Array 
     (
      [t] => 2016-08-31 15:48 
      [v] => 0.796 
     ) 

    [159] => Array 
     (
      [t] => 2016-08-31 15:54 
      [v] => 0.904 
     ) 

    [160] => Array 
     (
      [t] => 2016-08-31 16:00 
      [v] => 1.016 
     ) 

    [161] => Array 
     (
      [t] => 2016-08-31 16:06 
      [v] => 1.134 
     ) 

    [162] => Array 
     (
      [t] => 2016-08-31 16:12 
      [v] => 1.255 
     ) 

    [163] => Array 
     (
      [t] => 2016-08-31 16:18 
      [v] => 1.381 
     ) 

    [164] => Array 
     (
      [t] => 2016-08-31 16:24 
      [v] => 1.510 
     ) 

    [165] => Array 
     (
      [t] => 2016-08-31 16:30 
      [v] => 1.642 
     ) 

    [166] => Array 
     (
      [t] => 2016-08-31 16:36 
      [v] => 1.778 
     ) 

    [167] => Array 
     (
      [t] => 2016-08-31 16:42 
      [v] => 1.917 
     ) 

    [168] => Array 
     (
      [t] => 2016-08-31 16:48 
      [v] => 2.059 
     ) 

    [169] => Array 
     (
      [t] => 2016-08-31 16:54 
      [v] => 2.203 
     ) 

    [170] => Array 
     (
      [t] => 2016-08-31 17:00 
      [v] => 2.349 
     ) 

    [171] => Array 
     (
      [t] => 2016-08-31 17:06 
      [v] => 2.498 
     ) 

    [172] => Array 
     (
      [t] => 2016-08-31 17:12 
      [v] => 2.648 
     ) 

    [173] => Array 
     (
      [t] => 2016-08-31 17:18 
      [v] => 2.799 
     ) 

    [174] => Array 
     (
      [t] => 2016-08-31 17:24 
      [v] => 2.952 
     ) 

    [175] => Array 
     (
      [t] => 2016-08-31 17:30 
      [v] => 3.105 
     ) 

    [176] => Array 
     (
      [t] => 2016-08-31 17:36 
      [v] => 3.258 
     ) 

    [177] => Array 
     (
      [t] => 2016-08-31 17:42 
      [v] => 3.412 
     ) 

    [178] => Array 
     (
      [t] => 2016-08-31 17:48 
      [v] => 3.564 
     ) 

    [179] => Array 
     (
      [t] => 2016-08-31 17:54 
      [v] => 3.716 
     ) 

    [180] => Array 
     (
      [t] => 2016-08-31 18:00 
      [v] => 3.867 
     ) 

    [181] => Array 
     (
      [t] => 2016-08-31 18:06 
      [v] => 4.016 
     ) 

    [182] => Array 
     (
      [t] => 2016-08-31 18:12 
      [v] => 4.162 
     ) 

    [183] => Array 
     (
      [t] => 2016-08-31 18:18 
      [v] => 4.306 
     ) 

    [184] => Array 
     (
      [t] => 2016-08-31 18:24 
      [v] => 4.446 
     ) 

    [185] => Array 
     (
      [t] => 2016-08-31 18:30 
      [v] => 4.582 
     ) 

    [186] => Array 
     (
      [t] => 2016-08-31 18:36 
      [v] => 4.715 
     ) 

    [187] => Array 
     (
      [t] => 2016-08-31 18:42 
      [v] => 4.842 
     ) 

    [188] => Array 
     (
      [t] => 2016-08-31 18:48 
      [v] => 4.964 
     ) 

    [189] => Array 
     (
      [t] => 2016-08-31 18:54 
      [v] => 5.081 
     ) 

    [190] => Array 
     (
      [t] => 2016-08-31 19:00 
      [v] => 5.192 
     ) 

    [191] => Array 
     (
      [t] => 2016-08-31 19:06 
      [v] => 5.296 
     ) 

    [192] => Array 
     (
      [t] => 2016-08-31 19:12 
      [v] => 5.393 
     ) 

    [193] => Array 
     (
      [t] => 2016-08-31 19:18 
      [v] => 5.484 
     ) 

    [194] => Array 
     (
      [t] => 2016-08-31 19:24 
      [v] => 5.567 
     ) 

    [195] => Array 
     (
      [t] => 2016-08-31 19:30 
      [v] => 5.642 
     ) 

    [196] => Array 
     (
      [t] => 2016-08-31 19:36 
      [v] => 5.710 
     ) 

    [197] => Array 
     (
      [t] => 2016-08-31 19:42 
      [v] => 5.770 
     ) 

    [198] => Array 
     (
      [t] => 2016-08-31 19:48 
      [v] => 5.821 
     ) 

    [199] => Array 
     (
      [t] => 2016-08-31 19:54 
      [v] => 5.865 
     ) 

    [200] => Array 
     (
      [t] => 2016-08-31 20:00 
      [v] => 5.900 
     ) 

    [201] => Array 
     (
      [t] => 2016-08-31 20:06 
      [v] => 5.927 
     ) 

    [202] => Array 
     (
      [t] => 2016-08-31 20:12 
      [v] => 5.946 
     ) 

    [203] => Array 
     (
      [t] => 2016-08-31 20:18 
      [v] => 5.956 
     ) 

    [204] => Array 
     (
      [t] => 2016-08-31 20:24 
      [v] => 5.959 
     ) 

    [205] => Array 
     (
      [t] => 2016-08-31 20:30 
      [v] => 5.954 
     ) 

    [206] => Array 
     (
      [t] => 2016-08-31 20:36 
      [v] => 5.940 
     ) 

    [207] => Array 
     (
      [t] => 2016-08-31 20:42 
      [v] => 5.919 
     ) 

    [208] => Array 
     (
      [t] => 2016-08-31 20:48 
      [v] => 5.890 
     ) 

    [209] => Array 
     (
      [t] => 2016-08-31 20:54 
      [v] => 5.854 
     ) 

    [210] => Array 
     (
      [t] => 2016-08-31 21:00 
      [v] => 5.810 
     ) 

    [211] => Array 
     (
      [t] => 2016-08-31 21:06 
      [v] => 5.760 
     ) 

    [212] => Array 
     (
      [t] => 2016-08-31 21:12 
      [v] => 5.702 
     ) 

    [213] => Array 
     (
      [t] => 2016-08-31 21:18 
      [v] => 5.638 
     ) 

    [214] => Array 
     (
      [t] => 2016-08-31 21:24 
      [v] => 5.567 
     ) 

    [215] => Array 
     (
      [t] => 2016-08-31 21:30 
      [v] => 5.490 
     ) 

    [216] => Array 
     (
      [t] => 2016-08-31 21:36 
      [v] => 5.407 
     ) 

    [217] => Array 
     (
      [t] => 2016-08-31 21:42 
      [v] => 5.318 
     ) 

    [218] => Array 
     (
      [t] => 2016-08-31 21:48 
      [v] => 5.224 
     ) 

    [219] => Array 
     (
      [t] => 2016-08-31 21:54 
      [v] => 5.125 
     ) 

    [220] => Array 
     (
      [t] => 2016-08-31 22:00 
      [v] => 5.021 
     ) 

    [221] => Array 
     (
      [t] => 2016-08-31 22:06 
      [v] => 4.912 
     ) 

    [222] => Array 
     (
      [t] => 2016-08-31 22:12 
      [v] => 4.798 
     ) 

    [223] => Array 
     (
      [t] => 2016-08-31 22:18 
      [v] => 4.681 
     ) 

    [224] => Array 
     (
      [t] => 2016-08-31 22:24 
      [v] => 4.560 
     ) 

    [225] => Array 
     (
      [t] => 2016-08-31 22:30 
      [v] => 4.435 
     ) 

    [226] => Array 
     (
      [t] => 2016-08-31 22:36 
      [v] => 4.307 
     ) 

    [227] => Array 
     (
      [t] => 2016-08-31 22:42 
      [v] => 4.176 
     ) 

    [228] => Array 
     (
      [t] => 2016-08-31 22:48 
      [v] => 4.043 
     ) 

    [229] => Array 
     (
      [t] => 2016-08-31 22:54 
      [v] => 3.908 
     ) 

    [230] => Array 
     (
      [t] => 2016-08-31 23:00 
      [v] => 3.771 
     ) 

    [231] => Array 
     (
      [t] => 2016-08-31 23:06 
      [v] => 3.632 
     ) 

    [232] => Array 
     (
      [t] => 2016-08-31 23:12 
      [v] => 3.492 
     ) 

    [233] => Array 
     (
      [t] => 2016-08-31 23:18 
      [v] => 3.351 
     ) 

    [234] => Array 
     (
      [t] => 2016-08-31 23:24 
      [v] => 3.209 
     ) 

    [235] => Array 
     (
      [t] => 2016-08-31 23:30 
      [v] => 3.067 
     ) 

    [236] => Array 
     (
      [t] => 2016-08-31 23:36 
      [v] => 2.925 
     ) 

    [237] => Array 
     (
      [t] => 2016-08-31 23:42 
      [v] => 2.783 
     ) 

    [238] => Array 
     (
      [t] => 2016-08-31 23:48 
      [v] => 2.642 
     ) 

    [239] => Array 
     (
      [t] => 2016-08-31 23:54 
      [v] => 2.502 
     ) 

) 

이것은 내 코드입니다. 때로는 올바른 결과를 반환하지만 때로는 그렇지 않습니다. 내가 도대체 ​​뭘 잘못하고있는 겁니까?

$high_low = $high_final = $low_final = array(); 
    $high = $low = $result_obj[0]['v']; 
    $high_flag=true; $low_flag=true; 

    for($i=0; $i<count($result_obj); $i++){ 
     $todays_h_l = $result_obj[$i]; 
     $high_low[$todays_h_l['t']] = $todays_h_l['v']; 

     if($low_flag && $todays_h_l['v'] < $low){     
      $low = $todays_h_l['v']; 

      if(!isset($result_obj[$i+1]) || (isset($result_obj[$i+1]) && $result_obj[$i+1]['v'] > $low)){ 
       $low_final[$todays_h_l['t']] = $todays_h_l['v']; 
       $low = 1; 
       $low_flag=false; $high_flag=true; 
      } 
     } 

     if($high_flag && $todays_h_l['v'] > $high){ 
      $high = $todays_h_l['v']; 

      if(!isset($result_obj[$i+1]) || (isset($result_obj[$i+1]) && $result_obj[$i+1]['v'] < $high)){     
       $high_final[$todays_h_l['t']] = $todays_h_l['v']; 
       $high = 4; 
       $high_flag=false; $low_flag=true; 
      } 
     } 
    } 

Answer 1

아마도이 방법이 문제를 해결하는 데 도움이 될 수 있습니다.

//example data 
$result_obj = array(
['v'=>1],['v'=>2],['v'=>3.1],['v'=>2],['v'=>1],['v'=>0.1],['v'=>1], 
['v'=>2],['v'=>3.2],['v'=>2],['v'=>1],['v'=>0.2],['v'=>1],['v'=>2], 
['v'=>3.3],['v'=>2],['v'=>1],['v'=>0.3],['v'=>1]); 
//test up or down - here it means the value grows up 
$lookupWay = (bool)(($result_obj[0]['v']<$result_obj[1]['v'])); 
$collectMAX=array(); 
$collectMIN=array(); 
foreach($result_obj as $idx=>$set){ 
    //we lookup for max, because data is grow up 
    if($lookupWay && isset($result_obj[$idx+1])){ 
     //data goes back down, so  current is max 
     if($set['v']>$result_obj[$idx+1]['v']){ 
      $collectMAX[]=$set['v']; 
      $lookupWay=false; 
     } 

    //we lookup for min 
    } else if(isset($result_obj[$idx+1])) { 
     //data goes back up,current is min 
     if($set['v']<$result_obj[$idx+1]['v']){ 
      $collectMIN[]=$set['v']; 
      $lookupWay=true; 
     } 
    } 
} 
var_dump($collectMAX);//holds all high peaks 
var_dump($collectMIN);//holds all low peaks 

하지만 미세 조정해야 할 사항이 있습니다. 첫 번째 값이 같은 경우 등등 ...