array_slice

定义和用法

array_slice() 函数在数组中根据条件取出一段值，并返回。

注释：如果数组有字符串键，所返回的数组将保留键名。（参见例子 4）

实例

例子 1

从数组的第三个元素开始取出，并返回数组中的其余元素：

<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,2));
?>

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例子 2

从数组的第二个元素开始取出，并仅返回两个元素：

<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,1,2));
?>

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例子 3

使用负的 start 参数：

<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,-2,1));
?>

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例子 4

把 preserve 参数设置为 true：

<?php
$a=array("red","green","blue","yellow","brown");
print_r(array_slice($a,1,2,true));
?>

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例子 5

处理字符串键名和整数键名：

<?php
$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow","e"=>"brown");
print_r(array_slice($a,1,2));

$a=array("0"=>"red","1"=>"green","2"=>"blue","3"=>"yellow","4"=>"brown");
print_r(array_slice($a,1,2));
?>

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