array_slice PHP array function sequence array_slice - remove a value from the array based on conditions and return it

array_slice() definition and usage
array_slice() function takes out a value in the array based on conditions and returns it.
Note: If the array has string keys, the returned array will retain the key names. (See Example 4)
Syntax
array_slice(array,offset,length,preserve) Parameters Description
array Required. Specifies the input array.
offset required. numerical value. Specifies the starting position of the element to be retrieved.
If it is a positive number, it will be taken from the front to the back. If it is a negative value, the absolute value of the offset will be taken from the back to the front.
length optional. numerical value. Specifies the length of the returned array.
If it is a negative number, select the absolute number of elements of the value from back to front. If the value is not set, all elements are returned.
preserve Optional. Possible values:
true - reserved key
false - default - reset key
Example 1

Copy code The code is as follows:

$a=array(0=>"Dog ",1=>"Cat",2=>"Horse",3=>"Bird");
print_r(array_slice($a,1,2));
?>

Output:
Array ( [0] => Cat [1] => Horse ) Example 2
With negative offset parameter:

Copy code The code is as follows:

$a= array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
print_r(array_slice($a,-2,1));
?>

Output:
Array ( [0] => Horse ) Example 3
preserve parameter is set to true:

Copy code The code is as follows:

$a =array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
print_r(array_slice($a,1,2,true) ;

$a=array("a"=>"Dog","b"=>"Cat","c"=>"Horse","d"=>"Bird ");
print_r(array_slice($a,1,2));
?>

Output: Array ( [b] => Cat [c] => Horse ) The above introduces the array_slice PHP array function sequence array_slice - extract a value from an array according to conditions and return it, including the content of array_slice. I hope it will be helpful to friends who are interested in PHP tutorials.