How to Convert an Integer to an Array in PHP

How to convert an integer to an array in PHP?

You can use str_split and intval:

$number = 2468;

    $array  = array_map('intval', str_split($number));

var_dump($array);

Which will give the following output:

array(4) {
  [0] => int(2)
  [1] => int(4)
  [2] => int(6)
  [3] => int(8)
}

Demo

How to create integer out of array?

Simple use implode as

$array = array(7,4,7,2);
echo (int)implode("",$array);// 7472

Convert a comma-delimited string into array of integers?

You can achieve this by following code,

$integerIDs = array_map('intval', explode(',', $string));

Converting array of string to array of integers in PHP

You should use array_map instead of array_walk:

$numArray = array_map('intval', $numArray);

If you still want to use array_walk - refer to a manual which says:

If callback needs to be working with the actual values of the array, specify the first parameter of callback as a reference. Then, any changes made to those elements will be made in the original array itself.

As intval function doesn't work with references you need to wrap it in some other logics, something like:

array_walk($numArray, function(&$v){ $v = intval($v); });
// which is the same as @BizzyBob solution)))

Converting integer to array of strings

Simply use the string split function and reverse it.

$num = 321;
$array = str_split(strrev($num));

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

How to Convert Range of Integers into PHP Array

simple explode call:

$array=explode(',',$groups);

How to cast variable to array

You can cast a variable to an array by using:

    $var = (array)$arr;

convert string array to integer array in php

You can use array_map

$TaxIds = array_map(function($value) {
    return intval($value);
}, $TaxIds);

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