3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(0,1,2,3,4,5,6,7,8,9); $maxtries = intval(count($a)*(floatval(count($a)+1)/2.0)); $tries = 0; while(!empty($a) && $tries<$maxtries) { echo "Try number: $tries\n"; print_r($a); array_push($a, $a[$tries]); unset($a[$tries]); $tries += 1; } echo "done\n"; print_r($a);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Try number: 0 Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 ) Try number: 1 Array ( [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 ) Try number: 2 Array ( [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 ) Try number: 3 Array ( [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 ) Try number: 4 Array ( [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 ) Try number: 5 Array ( [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 ) Try number: 6 Array ( [6] => 6 [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 ) Try number: 7 Array ( [7] => 7 [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 ) Try number: 8 Array ( [8] => 8 [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 ) Try number: 9 Array ( [9] => 9 [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 ) Try number: 10 Array ( [10] => 0 [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 ) Try number: 11 Array ( [11] => 1 [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 ) Try number: 12 Array ( [12] => 2 [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 ) Try number: 13 Array ( [13] => 3 [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 ) Try number: 14 Array ( [14] => 4 [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 ) Try number: 15 Array ( [15] => 5 [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 ) Try number: 16 Array ( [16] => 6 [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 ) Try number: 17 Array ( [17] => 7 [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 ) Try number: 18 Array ( [18] => 8 [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 ) Try number: 19 Array ( [19] => 9 [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 ) Try number: 20 Array ( [20] => 0 [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 ) Try number: 21 Array ( [21] => 1 [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 ) Try number: 22 Array ( [22] => 2 [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 ) Try number: 23 Array ( [23] => 3 [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 ) Try number: 24 Array ( [24] => 4 [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 ) Try number: 25 Array ( [25] => 5 [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 ) Try number: 26 Array ( [26] => 6 [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 ) Try number: 27 Array ( [27] => 7 [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 ) Try number: 28 Array ( [28] => 8 [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 ) Try number: 29 Array ( [29] => 9 [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 ) Try number: 30 Array ( [30] => 0 [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 ) Try number: 31 Array ( [31] => 1 [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 ) Try number: 32 Array ( [32] => 2 [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 ) Try number: 33 Array ( [33] => 3 [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 ) Try number: 34 Array ( [34] => 4 [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 ) Try number: 35 Array ( [35] => 5 [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 ) Try number: 36 Array ( [36] => 6 [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 ) Try number: 37 Array ( [37] => 7 [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 ) Try number: 38 Array ( [38] => 8 [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 ) Try number: 39 Array ( [39] => 9 [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 ) Try number: 40 Array ( [40] => 0 [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 ) Try number: 41 Array ( [41] => 1 [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 ) Try number: 42 Array ( [42] => 2 [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 ) Try number: 43 Array ( [43] => 3 [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 ) Try number: 44 Array ( [44] => 4 [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 ) Try number: 45 Array ( [45] => 5 [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 ) Try number: 46 Array ( [46] => 6 [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 ) Try number: 47 Array ( [47] => 7 [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 ) Try number: 48 Array ( [48] => 8 [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 ) Try number: 49 Array ( [49] => 9 [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 ) Try number: 50 Array ( [50] => 0 [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 ) Try number: 51 Array ( [51] => 1 [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 [60] => 0 ) Try number: 52 Array ( [52] => 2 [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 [60] => 0 [61] => 1 ) Try number: 53 Array ( [53] => 3 [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 [60] => 0 [61] => 1 [62] => 2 ) Try number: 54 Array ( [54] => 4 [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 [60] => 0 [61] => 1 [62] => 2 [63] => 3 ) done Array ( [55] => 5 [56] => 6 [57] => 7 [58] => 8 [59] => 9 [60] => 0 [61] => 1 [62] => 2 [63] => 3 [64] => 4 )
preferences:
321.01 ms | 426 KiB | 310 Q