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PHP数组分割与数组接合

程序员文章站 2022-04-04 21:05:45
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  1. $fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

  2. $subset = array_slice($fruits, 3);
  3. print_r($subset);
  4. // output

  5. // Array ( [0] => Pear [1] => Grape [2] => Lemon [3] => Watermelon )
  6. ?>
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然后,使用下负长度:

  1. $fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

  2. $subset = array_slice($fruits, 2, -2);
  3. print_r($subset);
  4. // output

  5. // Array ( [0] => Orange [1] => Pear [2] => Grape )
  6. ?>
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接合数组 array_splice()

array_splice()函数会删除数组中从offset开始到offset+length 结束的所有元素,并以数组的形式返回所删除的元素。其形式为: array array_splice ( array array , int offset[,length[,array replacement]]) offset 为正值时,则接合将从距数组开头的offset 位置开始,offset 为负值时,接合将从距数组末尾的offset 位置开始。如果忽略可选的length 参数,则从offset 位置开始到数组结束之间的所有元素都将被删除。如果给出了length 且为正值,则接合将在距数组开头的offset + leng th 位置结束。相反,如果给出了length且为负值,则结合将在距数组开头的count(input_array)-length的位置结束。

例子:

  1. $fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

  2. $subset = array_splice($fruits, 4);
  3. print_r($fruits);

  4. print_r($subset);
  5. // output

  6. // Array ( [0] => Apple [1] => Banana [2] => Orange [3] => Pear )
  7. // Array ( [0] => Grape [1] => Lemon [2] => Watermelon )
  8. ?>
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可以使用可选参数replacement来指定取代目标部分的数组。

例子:

  1. $fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

  2. $subset = array_splice($fruits, 2, -1, array("Green Apple", "Red Apple"));
  3. print_r($fruits);

  4. print_r($subset);
  5. // output

  6. // Array ( [0] => Apple [1] => Banana [2] => Green Apple [3] => Red Apple [4] => Watermelon )
  7. // Array ( [0] => Orange [1] => Pear [2] => Grape [3] => Lemon )
  8. ?>
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