目录

PHP array_slice() 函数

❮ PHP 数组参考

示例

从第三个数组元素开始切片，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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定义和用法

array_slice() 函数返回数组的选定部分。

笔记：如果数组有字符串键，则返回的数组将始终保留键（参见示例 4）。

语法

array_slice( array, start, length, preserve)

参数值

Parameter	Description
array	Required. Specifies an array
start	Required. Numeric value. Specifies where the function will start the slice. 0 = the first element. If this value is set to a negative number, the function will start slicing that far from the last element. -2 means start at the second last element of the array.
length	Optional. Numeric value. Specifies the length of the returned array. If this value is set to a negative number, the function will stop slicing that far from the last element. If this value is not set, the function will return all elements, starting from the position set by the start-parameter.
preserve	Optional. Specifies if the function should preserve or reset the keys. Possible values: true - Preserve keys false - Default. Reset keys

技术细节

返回值：	返回数组的选定部分
PHP 版本：	4+
PHP 变更日志：	这个保存PHP 5.0.2 中添加了参数

更多示例

示例1

从第二个数组元素开始切片，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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示例2

使用负启动参数：

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

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示例3

将 keep 参数设置为 true 时：

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

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示例4

使用字符串和整数键：

<?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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❮ PHP 数组参考