Correct use of array_slice() function in PHP

Array is a common data type in PHP. The data in the array is usually taken out directly through the key of the array, or obtained through loop traversal. How to take out a section in the array, this article will show you how to use array_slice()The function takes out a segment from the array. First, let’s take a look at the syntax:

array_slice ( array $array   , int $offset   , int $length = null   , bool $preserve_keys = false   ) : array

• $array: the input array.

• $offset: Specifies the starting position of the element to be retrieved

• $length: Optional, specifies the length of the returned array.

• $preserve_keys: Optional, specifies whether the function retains the key name or resets the key name

• Return value: Returns one of the segments. If the $offset parameter is larger than the $array size, an empty $array will be returned.

Code example:

1. There are two parameters

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

输出：Array
( [0] => green[1] => blue[2] => yellow[3] => brown)

2. Three parameters

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

输出：Array
( [0] => green[1] => blue[2] => yellow)

3. Four parameters

<?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));
?>

输出：Array([b] => green [c] => blue)
Array([0] => green[1] => blue)

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