PHP array_fill() 函数

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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

array_fill — 用给定的值填充数组

说明

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array_fill(int $start_index, int $count, mixed $value): array

用 value 参数的值填充 count 个元素到数组， 开始键名由 start_index 参数指定。

参数

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start_index

      返回的数组的第一个索引值。

      如果 start_index 是负数，在 PHP 8.0.0 之前，返回的数组的第一个索引是 start_index， 而后面索引则从 0 开始；自 PHP 8.0.0 起， 负数键将会正常递增。

count

      要插入元素的数量。必须大于或等于 0 且小于或等于 2147483647。

value

      用来填充的值。

错误/异常

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如果 count超出范围，将会抛出 ValueError。

 

更新日志

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版本	说明
8.0.0	如果 array_fill() 的 count 超出范围现在将会抛出 ValueError， 之前会引发 E_WARNING 且函数返回 false。

实例

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实例1：

$a = array_fill(5, 6, 'banana');
dump($a);

// 输出

array(6) {
  [5] => string(6) "banana"
  [6] => string(6) "banana"
  [7] => string(6) "banana"
  [8] => string(6) "banana"
  [9] => string(6) "banana"
  [10] => string(6) "banana"
}

 

实例2：开始索引为负数的 array_fill() 示例

$a = array_fill(-2, 4, 'pear');
dump($a);

// 以上示例在 PHP 7 中的输出：

array(4) {
  [-2] => string(4) "pear"
  [0] => string(4) "pear"
  [1] => string(4) "pear"
  [2] => string(4) "pear"
}

// 以上示例在 PHP 8 中的输出：
Array(
    [-2] => pear
    [-1] => pear
    [0] => pear
    [1] => pear
)

注意 索引 -1 在 PHP 8.0.0 之前不存在

 

实例3：快速创建一个（10X10）的数组

$a = array_fill(0, 10, array_fill(0, 10, 0));
dump($a);

// 输出

array(10) {
  [0] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [1] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [2] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [3] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [4] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [5] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [6] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [7] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [8] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
  [9] => array(10) {
    [0] => int(0)
    [1] => int(0)
    [2] => int(0)
    [3] => int(0)
    [4] => int(0)
    [5] => int(0)
    [6] => int(0)
    [7] => int(0)
    [8] => int(0)
    [9] => int(0)
  }
}

参见

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• array_fill_keys() - 使用指定的键和值填充数组
• str_repeat() - 重复一个字符串
• range() - 根据范围创建数组，包含指定的元素

2023-07-25 更新 本文链接：https://upwqy.com/wiki/info/446.html

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