CODEWITHSUNDEEP
phparraysdiff
Saeed Falsafin
Saeed Falsafin

Reputation: 558

Find removed and added items of modified array

How to find what items are removed from last state array list and what items a add to new one? My arrays:

$arrayOld = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"];
$arrayNew = ["Z", "B", "C", "D", "E", "F", "G", "H", "I", "J", "Y"];

Explanation: I have an array called $arrayOld, User do some modification on the list and post a new array to the server and i want to know what items are removed from first array and what items are new!

Thanks

Upvotes: 0

Views: 835

Answers (3)

Saeed Falsafin
Saeed Falsafin

Reputation: 558

You can simply find those using array_diff:

$arrayOld = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"];
$arrayNew = ["Z", "B", "C", "D", "E", "F", "G", "H", "I", "J", "Y"];

$removes = array_diff($arrOld, $arrNew);
print_r($removes); // A , K

$adds = array_diff($arrNew,$arrOld);
print_r($adds); // Z , Y

As per php.net docs:

array_diff — Computes the difference of arrays

Compares array1 against one or more other arrays and returns the values in array1 that are not present in any of the other arrays.

php.function.array-diff

Upvotes: 2

Abdallah Elsabeeh
Abdallah Elsabeeh

Reputation: 616

use the diff function it will show all the different with the index of the change items 

$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"black","g"=>"purple");
$a3=array("a"=>"red","b"=>"black","h"=>"yellow");


$result=array_diff($a1,$a2,$a3);
print_r($result);

the result will be :

Array ( [b] => green [c] => blue );

Upvotes: 0

Praveen
Praveen

Reputation: 642

array_diff would be a solution,

Get adds,

 $new_elements = array_diff($arrayNew, $arrayOld);
    print_r($new_elements); // first parameter should be new array 
and second one should be old

Get Removals,

    $old_elements = array_diff($arrayOld, $arrayNew);
    print_r($old_elements); // Here first parameter should be old array 
and second one should be new

Upvotes: 0

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