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PHP array_merge replacing existing array values


PHP array_merge replacing existing array values

By : Dennis Gray
Date : November 17 2020, 04:28 AM
will help you I think it's because SeminarEvent created once and the used by pointer, so every time the same object is populated and every time the same link saved to array. So one possible solution here is to write $seminars[] = clone $seminar; instead of $seminars[] = $seminar;
code :


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Best way to add values to array (append an item or array_merge())

Best way to add values to array (append an item or array_merge())


By : user5213676
Date : March 29 2020, 07:55 AM
Does that help both are identical in this situation since you dont have any ordered or named keys to be concerned about. use whichever you prefer.
PHP array_merge that ignores key values that are not in the first/base array

PHP array_merge that ignores key values that are not in the first/base array


By : user3141598
Date : March 29 2020, 07:55 AM
around this issue The request "ignore any key value which is not contained with in the first/base array" calls for array_intersect_key()
code :
$array1 = array('a' => 1, 'b' => 2);
$array2 = array('b' => 3, 'c' => 4);
$result = array_merge($array1, array_intersect_key($array2, $array1));
PHP array_merge() with preference of first array and unique values only?

PHP array_merge() with preference of first array and unique values only?


By : Victoria Mueller
Date : March 29 2020, 07:55 AM
it should still fix some issue You're right to assume that using the array_merge, array_unique functions, and + operator would be slow. And I've written a bit of code to benchmark the speed of each combination...
Here is that code...
code :
<?php

class ArraySpeeds
{
    public $la = ['col1', 'col2_alias' => 'col2', 'col3'];
    public $a = ['col4', 'col5_alias' => 'col5', 'col6'];
    public $b = ['col7', 'col1', 'col5_alias' => 'col5', 'col2_alias' => 'col10'];
    public $c = [];

    public function executionTime ($callback)
    {
        $start = microtime (true);

        for ($i = 0; $i < 1000000; $i++) {
            $callback ();
        }

        return round ((microtime (true) - $start) * 1000) . '/ms' . PHP_EOL;
    }

    public function getTimes ()
    {
        $array_merge_time = $this->executionTime (function () {
            $this->c[0] = array_merge ($this->la, $this->a, $this->b);
        });

        $array_unique_time = $this->executionTime (function () {
            $merged = array_merge ($this->la, $this->a, $this->b);
            $this->c[1] = array_unique ($merged);
        });

        $addition_time = $this->executionTime (function () {
            $merged = array_merge ($this->la, $this->a, $this->b);
            $unique = array_unique ($merged);
            $this->c[2] = $this->la + $unique;
        });

        $array_diff_time = $this->executionTime (function () {
            $merged = array_merge ($this->a, $this->b);
            $diffed = array_diff ($merged, $this->la);

            $this->c[3] = array_merge ($diffed, $this->la);
        });

        echo print_r ($this->c[0], true), PHP_EOL;
        echo print_r ($this->c[1], true), PHP_EOL;
        echo print_r ($this->c[2], true), PHP_EOL;

        natsort ($this->c[3]);
        echo print_r ($this->c[3], true), PHP_EOL;

        echo 'array_merge: ', $array_merge_time;
        echo 'array_unique: ', $array_unique_time;
        echo 'addition: ', $addition_time;
        echo 'array_diff: ', $array_diff_time;
    }
}

$arrayspeeds = new ArraySpeeds ();
$arrayspeeds->getTimes ();
Array
(
    [0] => col1
    [col2_alias] => col10
    [1] => col3
    [2] => col4
    [col5_alias] => col5
    [3] => col6
    [4] => col7
    [5] => col1
)

Array
(
    [0] => col1
    [col2_alias] => col10
    [1] => col3
    [2] => col4
    [col5_alias] => col5
    [3] => col6
    [4] => col7
)

Array
(
    [0] => col1
    [col2_alias] => col2
    [1] => col3
    [2] => col4
    [col5_alias] => col5
    [3] => col6
    [4] => col7
)

Array
(
    [3] => col1
    [col2_alias] => col2
    [4] => col3
    [0] => col4
    [col5_alias] => col5
    [1] => col6
    [2] => col7
)

array_merge: 403/ms
array_unique: 1039/ms
addition: 1267/ms
array_diff: 993/ms
function foo (...$params)
{
    $a = [
        'col1',
        'col2_alias' => 'col2',
        'col3'
    ];

    $diff = array_diff (array_merge (...$params), $a);
    $merged = array_merge ($diff, $a);
    natsort ($merged);
    print_r ($merged);
}
adding up values in Firebase without replacing existing data into a textview using array

adding up values in Firebase without replacing existing data into a textview using array


By : Mark Schmidt
Date : March 29 2020, 07:55 AM
it helps some times I have a Firebase database. This is basically for a barber shop. So this is all the bookings which have been served (confirm). It currently holds the Uid of the user as a child. Within this child it has values other id's which each have the same value field names. , try this
code :
//declaration
float total = 0F;

 mRef.child("confirm").addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    for (DataSnapshot snapChild : snapshot.getChildren()) {
                        total += snapChild.child("totalCost").getValue(Float.class);
                    }
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }
array_merge is not replacing the matching $key

array_merge is not replacing the matching $key


By : user2628246
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further For numeric indices, array_merge will just append the new items to the end of the first array. This works well for string index, as the values gets overwritten. If you want to merge them for numeric indices, use "+" operator.
Check out this comment: https://www.php.net/manual/en/function.array-merge.php#92602
code :
Array
(
    [3] => Array
        (
            [a] => Location 3 new
            [b] => loc06
            [c] => Array
                (
                    [publisher] => publisher
                )

        )

    [2] => Array
        (
            [a] => Location 2
            [b] => loc02
            [c] => Array
                (
                )

        )

)
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