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PHP array_splice()接合数组用法示例

WBOY
WBOYOriginal
2016-06-13 09:35:441010browse

   在PHP中接合数组,我们有现成的函数可以用,那就是array_splice()函数,它会删除数组中从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。array_splice()语法格式为:

  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。

  来看一个标准的接合数组的例子,PHP代码:

  1

  2$fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

  3$subset = array_splice($fruits, 4);

  4print_r($fruits);

  5print_r($subset);

  6// 输出结果为:

  7// Array ( [0] => Apple [1] => Banana [2] => Orange [3] => Pear )

  8// Array ( [0] => Grape [1] => Lemon [2] => Watermelon )

  9?>

  我们还可以使用可选参数replacement来指定取代目标部分的数组。请看下面的例子:

  1

  2$fruits = array("Apple", "Banana", "Orange", "Pear", "Grape", "Lemon", "Watermelon");

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

  4print_r($fruits);

  5print_r($subset);

  6// 输出结果:

  7// Array ( [0] => Apple [1] => Banana [2] => Green Apple [3] => Red Apple [4] => Watermelon )

  8// Array ( [0] => Orange [1] => Pear [2] => Grape [3] => Lemon )

  9?>

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