|
| 1 | +<?php |
| 2 | + |
| 3 | +/* |
| 4 | + +-------------------------------------------------------------+ |
| 5 | + | Copyright (c) 2014 Facebook, Inc. (http://www.facebook.com) | |
| 6 | + +-------------------------------------------------------------+ |
| 7 | +*/ |
| 8 | + |
| 9 | +error_reporting(-1); |
| 10 | + |
| 11 | +echo "================= array of zero elements is possible =================\n"; |
| 12 | + |
| 13 | +$v = array(); |
| 14 | +var_dump($v); |
| 15 | +$v = []; |
| 16 | +var_dump($v); |
| 17 | + |
| 18 | +echo "================= array of 1 element is possible =================\n"; |
| 19 | + |
| 20 | +$v = array(TRUE); |
| 21 | +var_dump($v); |
| 22 | +$v = [TRUE]; |
| 23 | +var_dump($v); |
| 24 | +$v = array(0 => TRUE); // specify explicit key |
| 25 | +var_dump($v); |
| 26 | +$v = [0 => TRUE]; |
| 27 | +var_dump($v); |
| 28 | + |
| 29 | +echo "================= array of 2 elements each having the same type =================\n"; |
| 30 | + |
| 31 | +$v = array(123, -56); |
| 32 | +var_dump($v); |
| 33 | +$v = [123, -56]; |
| 34 | +var_dump($v); |
| 35 | +$v = array(0 => 123, 1 => -56); // specify explicit keys |
| 36 | +var_dump($v); |
| 37 | +$v = [0 => 123, 1 => -56]; |
| 38 | +var_dump($v); |
| 39 | + |
| 40 | +$pos = 1; |
| 41 | +$v = array(0 => 123, $pos => -56); // specify explicit keys |
| 42 | +var_dump($v); |
| 43 | +$v = [0 => 123, $pos => -56]; // key can be a variable |
| 44 | +var_dump($v); |
| 45 | + |
| 46 | +$i = 10; |
| 47 | +$v = array(0 => 123, $pos => -56); // specify explicit keys |
| 48 | +var_dump($v); |
| 49 | +$v = [$i - 10 => 123, $i - 9 => -56]; // key can be a runtime expression |
| 50 | +var_dump($v); |
| 51 | + |
| 52 | +echo "================= array of 5 elements each having different type =================\n"; |
| 53 | + |
| 54 | +$v = array(NULL, FALSE, 123, 34e12, "Hello"); |
| 55 | +var_dump($v); |
| 56 | +$v = [NULL, FALSE, 123, 34e12, "Hello"]; |
| 57 | +var_dump($v); |
| 58 | +$v = array(0 => NULL, 1 => FALSE, 2 => 123, 3 => 34e12, 4 => "Hello"); |
| 59 | +var_dump($v); |
| 60 | +$v = [0 => NULL, 1 => FALSE, 2 => 123, 3 => 34e12, 4 => "Hello"]; |
| 61 | +var_dump($v); |
| 62 | +$v = array(NULL, 1 => FALSE, 123, 3 => 34e12, "Hello"); // some keys default, others not |
| 63 | +var_dump($v); |
| 64 | +$v = [NULL, 1 => FALSE, 123, 3 => 34e12, "Hello"]; |
| 65 | +var_dump($v); |
| 66 | + |
| 67 | +echo "================= trailing comma permitted if list has at least one entry =================\n"; |
| 68 | + |
| 69 | +// $v = array(,); // error |
| 70 | +// $v = [,]; // error |
| 71 | + |
| 72 | +$v = array(TRUE,); |
| 73 | +var_dump($v); |
| 74 | +$v = [TRUE,]; |
| 75 | +var_dump($v); |
| 76 | +$v = array(0 => TRUE,); |
| 77 | +var_dump($v); |
| 78 | +$v = [0 => TRUE,]; |
| 79 | +var_dump($v); |
| 80 | + |
| 81 | +$v = array(123, -56,); |
| 82 | +var_dump($v); |
| 83 | +$v = [123, -56,]; |
| 84 | +var_dump($v); |
| 85 | +$v = array(0 => 123, 1 => -56,); |
| 86 | +var_dump($v); |
| 87 | +$v = [0 => 123, 1 => -56,]; |
| 88 | +var_dump($v); |
| 89 | + |
| 90 | +echo "================= specify keys in arbitrary order, initial values of runtime expressions, leave gaps =================\n"; |
| 91 | + |
| 92 | +$i = 6; |
| 93 | +$j = 12; |
| 94 | +$v = array(7 => 123, 3 => $i, 6 => ++$j); |
| 95 | +var_dump($v); |
| 96 | + |
| 97 | +$i = 6; |
| 98 | +$j = 12; |
| 99 | +$v = [7 => 123, 3 => $i, 6 => ++$j]; |
| 100 | +var_dump($v); |
| 101 | + |
| 102 | +foreach($v as $e) // only has 3 elements ([3], [6], and [7]), not 8 ([0]-[7]) |
| 103 | +{ |
| 104 | + echo $e.' '; |
| 105 | +} |
| 106 | +echo "\n"; |
| 107 | + |
| 108 | +echo "\$v[1] is >".$v[1]."<\n"; var_dump($v1[1]); // access non-existant element |
| 109 | +echo "\$v[4] is >".$v[4]."<\n"; var_dump($v1[4]); // access non-existant element |
| 110 | + |
| 111 | +$v[1] = TRUE; // increases array to 4 elements |
| 112 | +$v[4] = 99; // increases array to 5 elements |
| 113 | +var_dump($v); |
| 114 | +foreach($v as $e) // now has 5 elements |
| 115 | +{ |
| 116 | + echo $e.' '; |
| 117 | +} |
| 118 | +echo "\n"; |
| 119 | + |
| 120 | +echo "================= duplicate keys allowed, but lexically final one used =================\n"; |
| 121 | + |
| 122 | +$v = array(2 => 23, 1 => 10, 2 => 46, 1.9 => 6); // key 1.9 is truncated to key 1 |
| 123 | +var_dump($v); |
| 124 | + |
| 125 | +echo "================= string keys can be expressions too =================\n"; |
| 126 | + |
| 127 | +$s1 = "color"; |
| 128 | +$s2 = "shape"; |
| 129 | +$v = array($s1 => "red", $s2 => "square"); |
| 130 | +var_dump($v); |
| 131 | + |
| 132 | +echo "================= can mix int and string keys =================\n"; |
| 133 | + |
| 134 | +// "4" as key is taken as key 4 |
| 135 | +// 9.2 as key is truncated to key 9 |
| 136 | +// "12.8" as key is treated as key with that string, NOT truncated and made int 12 |
| 137 | +// NULL as key becomes key "" |
| 138 | + |
| 139 | +$v = array("red" => 10, "4" => 3, 9.2 => 5, "12.8" => 111, NULL => 1); |
| 140 | +var_dump($v); |
| 141 | + |
| 142 | +$v = array(FALSE => -4); // FALSE as key becomes key 0 |
| 143 | +var_dump($v); |
| 144 | +$v = array("" => -3); |
| 145 | +var_dump($v); |
| 146 | +$v = array(INF => 21); // INF as key becomes key 0/IntMin/0 (imp-def?) |
| 147 | +var_dump($v); |
| 148 | +$v = array(-INF => -1); // -INF as key becomes key 0/IntMin/IntMin (imp-def?) |
| 149 | +var_dump($v); |
| 150 | +$v = array(NAN => 123); // NAN as key becomes key of IntMin/IntMin/IntMin (imp-def?) |
| 151 | +var_dump($v); |
| 152 | + |
| 153 | +echo "================= arrays some of whose elements are arrays, and so on =================\n"; |
| 154 | + |
| 155 | +$c = array("red", "white", "blue"); |
| 156 | +$v = array(10, $c, NULL, array(FALSE, NULL, $c)); |
| 157 | +var_dump($v); |
| 158 | + |
| 159 | +$v = [[2,4,6,8], [5,10], [100,200,300]]; |
| 160 | +var_dump($v); |
| 161 | + |
| 162 | +echo "================= see if int keys can be specified in any base. =================\n"; |
| 163 | + |
| 164 | +$v = [12 => 10, 0x10 => 16, 010 => 8, 0b11 => 2]; |
| 165 | +var_dump($v); |
| 166 | + |
| 167 | +echo "================= what about int-looking strings? It appears not. =================\n"; |
| 168 | + |
| 169 | +$v = ["12" => 10, "0x10" => 16, "010" => 8, "0b11" => 2]; |
| 170 | +var_dump($v); |
| 171 | + |
| 172 | +echo "================= iterate using foreach and compare with for loop =================\n"; |
| 173 | + |
| 174 | +$v = array(2 => TRUE, 0 => 123, 1 => 34.5, -1 => "red"); |
| 175 | +var_dump($v); |
| 176 | +foreach($v as $e) |
| 177 | +{ |
| 178 | + echo $e.' '; |
| 179 | +} |
| 180 | +echo "\n"; |
| 181 | +for ($i = -1; $i <= 2; ++$i) |
| 182 | +{ |
| 183 | + echo $v[$i].' '; |
| 184 | +} |
| 185 | +echo "\n"; |
| 186 | + |
| 187 | +echo "================= remove some elements from an array =================\n"; |
| 188 | + |
| 189 | +$v = array("red" => TRUE, 123, 9 => 34e12, "Hello"); |
| 190 | +var_dump($v); |
| 191 | +unset($v[0], $v["red"]); |
| 192 | +var_dump($v); |
0 commit comments