How to find missing number from an array without using function in php?

Question

I have two array i.e $arr1 and $arr2 where I want to find missing value of $arr1 which is not present in $arr2 without using function like array_diff(), count(), explode(), implode() etc. So, How can I do this? Please help me.

code:

<?php
    $arr1 = array('2','3','4','5');
    $arr2 = array('1','6','7','8');

    $array = array_diff($arr1,$arr2);
    print_r($arr2);
?>

I am simply use array_diff() function to find missing value of an array but I want to do without any function @AlivetoDie — omkara
– omkara, Commented Jul 6, 2019 at 5:42

Death-is-the-real-truth · Accepted Answer · 2019-07-06 05:59:27Z

1

First approach:-

$missingValuesArray = array();
    foreach($arr1 as $arr){
       if(!in_array($arr,$arr2)){
           $missingValuesArray[] = $arr;
       }
    }

    print_r($missingValuesArray);

Output:- https://3v4l.org/UBS9G

Second approach:-

 $missingValuesArray = array();
    foreach($arr1 as $arr){
        $counter = 0;
        foreach($arr2 as $ar){
           if($arr != $ar){
               $counter++;
           }
        }
        if($counter == sizeof($arr2)){
            $missingValuesArray[] = $arr;
        }
    }

    print_r($missingValuesArray);

Output:- https://3v4l.org/Uu6Ob

answered Jul 6, 2019 at 5:59

Death-is-the-real-truth

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3 Comments

Rajendra Singh Over a year ago

in the first approach, you are using an in_array() function.

Death-is-the-real-truth Over a year ago

@RajendraSingh i gave him all approaches what came into my mind apart from array_diff().It's up to him to select any one or discard all

Rajendra Singh Over a year ago

Yeah, I think Second approach suits user requirement. The first approach with in_array() is also good but it's same like user attempt with array_diff()

Sonam Tripathi · Accepted Answer · 2019-07-06 06:58:15Z

1

Requirement can be achieved by :

$arr1 = array('2','3','4','5');
$arr2 = array('1','6','7','8');

$diff = array();
$diff = $arr1;
$arrayDiff = array();

foreach($arr1 AS $value) {
    foreach($arr2 AS $val) {
        if ($value == $val) {
           $arrayDiff[] = $value;
           continue;
        }
    } 
}
foreach ($arrayDiff AS  $k=>$v) {
    if (($key = array_search($v, $diff)) !== false) {
        unset($diff[$key]);
    }
}
print_r($diff);

answered Jul 6, 2019 at 6:58

Sonam Tripathi

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1 Comment

Rajendra Singh Over a year ago

you are using array_search()

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