(PHP 4, PHP 5, PHP 7)
array_splice — Remove a portion of the array and replace it with something else
&$input
   , int $offset
   [, int $length = 0
   [, mixed $replacement = array()
  ]] )
   Removes the elements designated by offset and
   length from the input array,
   and replaces them with the elements of the
   replacement array, if supplied.
  
   Note that numeric keys in input are not preserved.
  
Note: If
replacementis not an array, it will be typecast to one (i.e.(array) $parameter). This may result in unexpected behavior when using an object orNULLreplacement.
inputThe input array.
offset
       If offset is positive then the start of removed
       portion is at that offset from the beginning of the
       input array.  If offset
       is negative then it starts that far from the end of the
       input array.
      
length
       If length is omitted, removes everything
       from offset to the end of the array. If
       length is specified and is positive, then
       that many elements will be removed. If
       length is specified and is negative then
       the end of the removed portion will be that many elements from
       the end of the array. If length is
       specified and is zero, no elements will be removed.
       Tip: to remove everything from
       offset to the end of the array when
       replacement is also specified, use
       count($input) for
       length.
      
replacement
       If replacement array is specified, then the
       removed elements are replaced with elements from this array.
      
       If offset and length
       are such that nothing is removed, then the elements from the
       replacement array are inserted in the place
       specified by the offset. Note that keys in
       replacement array are not preserved.
      
       If replacement is just one element it is
       not necessary to put array()
       around it, unless the element is an array itself, an object or NULL.
      
Returns an array consisting of the extracted elements.
Example #1 array_splice() examples
<?php
$input = array("red", "green", "blue", "yellow");
array_splice($input, 2);
// $input is now array("red", "green")
$input = array("red", "green", "blue", "yellow");
array_splice($input, 1, -1);
// $input is now array("red", "yellow")
$input = array("red", "green", "blue", "yellow");
array_splice($input, 1, count($input), "orange");
// $input is now array("red", "orange")
$input = array("red", "green", "blue", "yellow");
array_splice($input, -1, 1, array("black", "maroon"));
// $input is now array("red", "green",
//          "blue", "black", "maroon")
$input = array("red", "green", "blue", "yellow");
array_splice($input, 3, 0, "purple");
// $input is now array("red", "green",
//          "blue", "purple", "yellow");
?>
Example #2 array_splice() examples
The following statements change the values of $input the same way:
<?php
array_push($input, $x, $y);
array_splice($input, count($input), 0, array($x, $y));
array_pop($input);
array_splice($input, -1);
array_shift($input);
array_splice($input, 0, 1);
array_unshift($input, $x, $y);
array_splice($input, 0, 0, array($x, $y));
$input[$x] = $y; // for arrays where key equals offset
array_splice($input, $x, 1, $y);
?>