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【PHP】 Range関数に第三引数あったんやね

Last updated at Posted at 2022-09-28

第三引数step

指定した範囲の数字配列を作る時にrangeをよく使います。

第三引数で2づつ増える、3づつ減るなどを指定できるようでした。

昇順
$ranges = range(1,100,2);

array:50 [
  0 => 1
  1 => 3
  2 => 5
  3 => 7
  4 => 9
  5 => 11
  6 => 13
  7 => 15
  8 => 17
  9 => 19
  10 => 21
  11 => 23
  12 => 25
......
]
降順
$ranges = range(100,1,-3);

array:34 [
  0 => 100
  1 => 97
  2 => 94
  3 => 91
  4 => 88
  5 => 85
  6 => 82
  7 => 79
  8 => 76
......
]

第三引数、-数値でも+数値でも挙動が変わらなかった。

第三引数あったの知らなかった

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