How to remove only one element from array in multiple duplicates in php

Question

I am writing code for add and remove array in php. The arrays are pushing succesfully according to my requirement. Now I want to remove the array element. But Here is the condition. I have duplicate values in this array. So I just want to remove only one element of duplicate values not all

Here is the code

<?php
session_start();
$id = $_POST['value'];

$_SESSION['id'] = $id ;

if(!isset($_SESSION['cart']))
{
$_SESSION['cart'] = array();
}
array_push($_SESSION['cart'], $id);


echo true;



?>

Here is the array I am getting

Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 0 [4] => 1 [5] => 1 [6] => 6 [7] => 0 [8] => 0 [9] => 2 [10] => 0 [11] => 0 [12] => 5 [13] => 1 [14] => 1 )

For example. I have multiple elements of 0 in this array. So I want to remove only one element not all.

Thanks

You want to remove only one element from those which have same value, but which one? You should tell us that, but also you should try to do it yourself first instead of asking us to do it for you. There are tons of easy docs on the web about php arrays — Kaddath
– Kaddath, Commented Aug 23, 2017 at 14:13
I try before upload that please provide me that doc if you have that .. and in my question everything is clearly mention @Kaddath — Azad Chouhan
– Azad Chouhan, Commented Aug 23, 2017 at 14:14

Momo Kebab · Accepted Answer · 2017-08-23 14:24:11Z

1

Try this :

$newarray = array();
$alreadydeleted = array();
foreach ($oldarray AS $key => $value)
{
    if (!in_array($value, $newarray) || in_array($value, $alreadydeleted))
        $newarray[$key] = $value;
    else
        $alreadydeleted[$key] = $value;
}

And you should have your new array with one duplicate removed

edited Aug 23, 2017 at 14:24

answered Aug 23, 2017 at 14:17

Momo Kebab

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5 Comments

Azad Chouhan Over a year ago

I want to remove one value from the array how can I do that? For example In my array you see there are multiple 0 values. and I want to remove only one

Momo Kebab Over a year ago

I edited the answer this should remove only one duplicate

Martijn Over a year ago

A foreach and two in_array make this a costly operation :)

Kaddath Over a year ago

@Martijn if he wants to remove one duplicate for each value, he will need a loop even with Don't Panic's solution. Not saying this answer is better, but you're not right if you think array_search is less costly than in_array. By the way, if he doesn't want to remove all duplicates, Don't Panic's solution would also need to track elements removed in some way or another

Martijn Over a year ago

It still is constly. But that is because of the structure of his data, it's not really doable in an efficient way

Martijn · Accepted Answer · 2017-08-23 14:27:17Z

1

You should not continue as you are, but take time to reformat. You are a cart, this can be done easier and more future-proof. When this project increases in size and complexity, this will come back to haunt you (building 5 [small] shops taught me this).

Instead of adding a value which is the ID of a product, add a key which is the ID of the product, with an array of information about it, like quantity.

$_SESSION['cart'] = array();

// to add a product:
$_SESSION['cart'][ $product_id ] = array('quantity'=>5);

// To remove from your array:
unset($_SESSION['cart'][ $product_id ]);

// To change the amount
$_SESSION['cart'][ $product_id ]['quantity'] = $newValue;
// Or, alternatively:
$_SESSION['cart'][ $product_id ]['quantity'] += 1; // add one.

edited Aug 23, 2017 at 14:27

answered Aug 23, 2017 at 14:23

Martijn

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2 Comments

Don't Panic Over a year ago

I agree with this approach in general, but I think the OP is asking about reducing the quantity of one item by one, not removing the item altogether.

Martijn Over a year ago

Added that demo as well :)

Don't Panic · Accepted Answer · 2017-08-23 14:26:03Z

0

To remove one instance of an ID from $_SESSION['cart'], you can use array_search to look for the posted value in that array and return its key if it's found.

$key = array_search($_POST['value'], $_SESSION['cart']);

array_search will return the first matching key, (so the key for just one item).

If a key is found, unset that key, and you'll remove only one of the corresponding value.

if ($key !== false) unset($_SESSION['cart'][$key]);

answered Aug 23, 2017 at 14:26

Don't Panic

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2 Comments

Azad Chouhan Over a year ago

Thank you its working. This is what I am looking for

Don't Panic Over a year ago

You're welcome. The answer by @Martijn does contain some good advice, though, if this is for a sort of shopping cart app. Using the item id as the key may be easier to work with.

Keyur Padalia · Accepted Answer · 2017-08-23 14:19:03Z

0

<?php
session_start();
$id = $_POST['value'];

$_SESSION['id'] = $id ;

if(!isset($_SESSION['cart']))
{
$_SESSION['cart'] = array();
}

//You can try this
if(!array_search($id,$_SESSION['cart'],TRUE))
{
    array_push($_SESSION['cart'], $id);
}

//OR can do this after array_push
$new_unique_array = array_unique($_SESSION['cart']);


echo true;



?>

answered Aug 23, 2017 at 14:19

Keyur Padalia

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Comments

Minas Jean · Accepted Answer · 2017-08-23 14:25:50Z

0

if (($key = array_search(0, $array)) !== false) {
    unset($array[$key]);
}

So first occurring value 0 will delete . Try this

answered Aug 23, 2017 at 14:25

Minas Jean

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