How to identified modified elements in an array in php

Question

This is my first array

$old = array(
1,2,3,4,5
);

$new(
2,4,5,6
);

I can do by using foreach command and then compare with two arrays. But the problems is I have to separate with which numbers were newly added and which numbers were removed.

And both array can be changed dynamically

Edit:

I have created a function

function get_diff($old,$new){
$small_arr = $large_arr = array();

if( count($old) > count($new) ){
    $small_arr = $new;
    $large_arr = $old;
}else{
    $small_arr = $old;
    $large_arr = $new;
}

$arr = array_diff($large_arr, $small_arr);

return $arr;

}

Dino Babu · Accepted Answer · 2012-11-20 03:57:40Z

2

Try this :

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

Multiple occurrences in $array1 are all treated the same way. This will output :

Array
(
    [1] => blue
)

answered Nov 20, 2012 at 3:57

Dino Babu

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1 Comment

KKK Over a year ago

Thanks. But i have to find which elements were added, which are removed

xelber · Accepted Answer · 2012-11-20 04:10:52Z

1

$old = array(
1,2,3,4,5
);
print_r($old);

$new = array(
2,4,5,6
);
print_r($new);
$removed = array_diff($old, $new);
print_r($removed);

$added = array_diff($new,$old);
print_r($added);

Use array diff basically

answered Nov 20, 2012 at 4:10

xelber

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1 Comment

KKK Over a year ago

Wow... So simple, Working perfectly, Thanks xelbel :)

Dino Babu · Accepted Answer · 2012-11-20 04:04:53Z

0

Also check these functions :

http://www.php.net/manual/en/function.array-diff-assoc.php

http://www.php.net/manual/en/function.array-intersect.php

http://www.php.net/manual/en/function.array-intersect-assoc.php

answered Nov 20, 2012 at 4:04

Dino Babu

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Comments

Sibu · Accepted Answer · 2012-11-20 04:15:49Z

0

<?php

function get_diff($old,$new){
$small_arr = $large_arr = array();

if( count($old) > count($new) ){
    $small_arr = $new;
    $large_arr = $old;
}else{
    $small_arr = $old;
    $large_arr = $new;
}

    $arr = array_diff($large_arr, $small_arr);
    $values = "New values = ";
    foreach($arr as $arr_values){
        $values.=$arr_values.",";
    }
    $values.="<br/>";
    $same_arr = array_intersect($large_arr,$small_arr);
    $values.= "Earlier values = ";
    foreach($same_arr as $same_values){
        $values.=$same_values.",";
    }
return $values;

}
$old = array(1,2,3,4,5);

$new= array(2,4,5,6);
echo get_diff($old,$new);
?>

DEMO

answered Nov 20, 2012 at 4:15

Sibu

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