Insert two items after a particular index of a multidimensional PHP array and remove array at existing index

Question

I would like to insert two arrays after a particular index matches a condition in a multidimensional array while in a foreach loop and remove the existing array at that index

Sample array:

$array = array( 
  array( 1, 2, 3 ), 
  array( 4, 5, 6 ), 
  array( 7, 8, 9 ) 
);

After inserting and removing existing index array

$array = array( 
  array( 1, 2, 3 ), 
  array( 'new', 'array' ), 
  array( 'another', 'item' ), 
  array( 7, 8, 9 )
);

While in a loop when a condition is met so:

foreach ( $array as $index => $value ) :
    if ( $index % 2 == 0 ) :
    // insert two array elements in $array after index $index and remove $index
    endif;
endforeach;

Any help is appreciated.

UPDATE:

I've tried array_splice() but because it increases the length of the existing array on a match, it ends up doing overriding the new array elements in the loop as well.

php.net/manual/en/function.array-splice.php

AbraCadaver
– AbraCadaver

2017-04-03 21:14:02 +00:00
Commented Apr 3, 2017 at 21:14 — AbraCadaver
– AbraCadaver, Commented Apr 3, 2017 at 21:14

miken32 · Accepted Answer · 2017-04-03 22:00:12Z

2

Using a foreach loop for this would be wasteful. Just use array_splice() instead:

<?php
$array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
$replacement = [['new', 'array'], ['another', 'item']];
$target = 1;

array_splice($array, $target, 1, $replacement);
print_r($array);

Based on your edits you may want to try this:

<?php
$array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
$replacement = [['new', 'array'], ['another', 'item']];
$new = [];

foreach ($array as $k=>$v) {
    if ($k % 2 == 0) {
        foreach($replacement as $r) {
            $new[] = $r;
        }
    } else {
        $new[] = $v;
    }
}
print_r($new);

edited Apr 3, 2017 at 22:00

answered Apr 3, 2017 at 21:14

miken32

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5 Comments

Kamran Khan Over a year ago

The actual array has 100+ arrays and I'm only replacing indexes when a particular match is found. I tried to simplify the code for an answer without adding unnecessary complexity to the problem at hand.

miken32 Over a year ago

You said "a particular index" so that's what I answered for. If you'd like to revise your question, please do so. It might also help to show what attempts you've made to solve the problem and where they went wrong.

Kamran Khan Over a year ago

I also said "while in a loop"

Kamran Khan Over a year ago

I apologize. array_splice() doesn't work. I'll make the original question more thorough.

miken32 Over a year ago

You're going to have problems altering an array while you're iterating it, I do not advise it.

Kamran Khan · Accepted Answer · 2017-04-03 22:00:09Z

1

I got it work with the following changes:

$array = array( 
    array( 1, 2, 3 ), 
    array( 4, 5, 6 ), 
    array( 7, 8, 9 ) 
);

$new_array = array();

foreach ( $array as $index => $value ) {

    if ( $index % 2 == 0 ) {

        array_push( $new_array, array( 'new', 'array' ) );
        array_push( $new_array, array( 'another', 'array' ) );

        continue;

    }

    array_push( $new_array, $array[ $index ] );

}

$array = $new_array;

answered Apr 3, 2017 at 22:00

Kamran Khan

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