Move last array string to end of second last array string

Question

I have an array like this:

$array = array(
    0 => "a,b",
    1 => "c,d",
    2 => "e,f",
    3 => "g,h", 
);

I would like to merge the last two array elements (2 and 3) into a one like this:

$array = array(
    0 => "a,b",
    1 => "c,d",
    2 => "e,f,g,h", 
);

How can I do it using PHP?

Both answers contain solutions for the case that it is always the last two elements. — GrumpyCrouton, Sep 04 '19 at 13:43

splash58 · Accepted Answer · 2019-08-31T08:09:49.957

2

Remove tow last items by array_splice and add implode of them

$temp = array_splice($array,-2); 
$result = array_merge($array, (array) implode(',', $temp));

demo

As @Nick mentioned, you can do it by

$temp = array_splice($array,-2); 
$array[] = implode(',', $temp);

edited Aug 31 '19 at 08:09

answered Aug 30 '19 at 13:19

splash58

26,043
3
22
34

You already did change the source array with `array_splice`. That's why I made my suggestion... – Nick Aug 31 '19 at 00:19

score 1 · Answer 2 · answered Aug 30 '19 at 13:18

Simple, use array_pop() to remove the last 2 elements, then concatenate them, then add them back to the original array.

$array = array(
    0 => "a,b",
    1 => "c,d",
    2 => "e,f",
    3 => "g,h", 
);

$element3 = array_pop($array); //grab value of the last element, and remove it from the array.
$element2 = array_pop($array); 

$array[] = "$element2,$element3";

this will always work if it's always supposed to be the last 2 elements.

score 0 · Answer 3 · answered Jul 03 '22 at 09:50

This can be achieved with a one-liner that unconditionally pushes that joined strings of the last two elements after consuming them with array_splice(). In other words, the last two elements are removed, joined, then re-pushed into the array as a single element.

The $temp variable in @solash58's answer is not necessary -- the consumption of the last two elements will occur before the auto-incremented index is generated.

Code: (Demo)

$array = [
    0 => "a,b",
    1 => "c,d",
    2 => "e,f",
    3 => "g,h", 
];

$array[] = implode(",", array_splice($array, -2));
var_export($array);

Output:

array (
  0 => 'a,b',
  1 => 'c,d',
  2 => 'e,f,g,h',
)

Move last array string to end of second last array string

3 Answers3