array slice in PHP

array slice() function is used to extract selected part from input array.

Syntax:

array_slice(array,start,length,preserve)

Parameters Description:

array : Required. Specifies an array

begin : Required. Numeric value. Specifies where the function will begin the slice. 0 = the first element. In the value that this value is situated to a negative number, the function will start slicing that last from the final component. -2 methods start at the second last element of the array.

length : Optional. Numeric value. Indicates the length of the returned array.
If this value is not set, the function will return all elements, starting from the position set by the start-parameter.
preserve : Optional.
      Possible values:

• true -  Preserve keys
• false - Default - Reset keys

Example:

<?php
$daysarr1 = array( 0=>"Sunday",1=>"Monday",2=>"Tuesday",3=>"Wednesday" ); 

print_r(array_slice($daysarr1,1,2));
$daysarr2 = array( 0=>"Sunday",1=>"Monday",2=>"Tuesday",3=>"Wednesday" );
echo "using negative start parameter";
print_r(array_slice($daysarr2,-2,1)); 
$daysarr3 = array( 0=>"Sunday",1=>"Monday",2=>"Tuesday",3=>"Wednesday" );
echo "using preserve parameter set to true"; 
print_r(array_slice($daysarr3,1,2,true));
print_r($daysarr3); 
$daysarr4 = array( "a"=>"Sunday","b"=>"Monday","c"=>"Tuesday","d"=>"Wednesday" );
echo "using string keys";
print_r(array_slice($daysarr4,1,2));
?>

O/P:

Array ( 
          [0] => Monday 
          [1] => Tuesday 
         )
using negative start parameter
Array (
         [0] => Tuesday
        )
using preserve parameter set to true
Array ( 
          [1] => Monday
          [2] => Tuesday
        )
using string keys
Array (
          [b] => Monday 
          [c] => Tuesday
        )