php сравнить ключи массива

array_diff_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

array_diff_assoc — Вычисляет расхождение массивов с дополнительной проверкой индекса

Описание

Список параметров

Массивы для сравнения

Возвращаемые значения

Примеры

Пример #1 Пример использования array_diff_assoc()

Результат выполнения данного примера:

Пример #2 Пример использования array_diff_assoc()

Результат выполнения данного примера:

Примечания

Замечание: Убедитесь, что передаёте аргументы в правильном порядке, когда сравниваете схожие массивы с большим количеством ключей. Новый массив должен быть первым.

Смотрите также

User Contributed Notes 18 notes

Works more like the original function:

an earlier post for recursive array_diff_assoc failed because isset returned false on an array element containing a null value. I updated the code so it compares null values too.

If you’re looking for a true array_diff_assoc, comparing arrays to determine the difference between two, finding missing values from both, you can use this along with array_merge.

print_r(array_diff_assoc($b,$a));
// returns
array
(
[d] => 4
)

print_r(array_merge(array_diff_assoc($a,$b),array_diff_assoc($b,$a)));
// returns
array
(
[c] => 3
[d] => 4
)

The following will recursively do an array_diff_assoc, which will calculate differences on a multi-dimensional level. This not display any notices if a key don’t exist and if error_reporting is set to E_ALL:

The direction of the arguments does actually make a difference:

To diff between n-dimensional array, juste use this :

To unset elements in an array if you know the keys but not the values, you can do:

array_diff_assoc can also be used to find the duplicates in an array

NOTE: the diff_array also removes all the duplicate values that match to the values in the second array:

// yields: array(«b»,»c») the duplicate «a» values are removed
?>

Recursive implementation accepting multiple n-level-arrays as parameters:

For recursive diff of multiple arrays, exending solution provided by Gosh.

Yet another recursive implementation, without if-else hell and with multiple parameters just like the original.

Источник

array_diff

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

array_diff — Вычислить расхождение массивов

Описание

Список параметров

Массивы, с которыми идёт сравнение

Возвращаемые значения

Примеры

Пример #1 Пример использования array_diff()

Пример #2 Пример использования array_diff() с несовпадающими типами

$source = [new S ( ‘a’ ), new S ( ‘b’ ), new S ( ‘c’ )];
$filter = [new S ( ‘b’ ), new S ( ‘c’ ), new S ( ‘d’ )];

Примечания

Смотрите также

User Contributed Notes 27 notes

array_diff(A,B) returns all elements from A, which are not elements of B (= A without B).

You should include this in the documentation more precisely, I think.

array_diff provides a handy way of deleting array elements by their value, without having to unset it by key, through a lengthy foreach loop and then having to rekey the array.

If you want a simple way to show values that are in either array, but not both, you can use this:

I´ve been looking for a array_diff that works with recursive arrays, I´ve tried the ottodenn at gmail dot com function but to my case it doesn´t worked as expected, so I made my own. I´ve haven´t tested this extensively, but I´ll explain my scenario, and this works great at that case 😀

We got 2 arrays like these:

I realy hopes that this could help some1 as I´ve been helped a lot with some users experiences. (Just please double check if it would work for your case, as I sad I just tested to a scenario like the one I exposed)

I just came upon a really good use for array_diff(). When reading a dir(opendir;readdir), I _rarely_ want «.» or «..» to be in the array of files I’m creating. Here’s a simple way to remove them:

If you just need to know if two arrays’ values are exactly the same (regardless of keys and order), then instead of using array_diff, this is a simple method:

?>

The function returns true only if the two arrays contain the same number of values and each value in one array has an exact duplicate in the other array. Everything else will return false.

my alternative method for evaluating if two arrays contain (all) identical values:

?>

may be slightly faster (10-20%) than this array_diff method:

?>

but only when the two arrays contain the same number of values and then only in some cases. Otherwise the latter method will be radically faster due to the use of a count() test before the array_diff().

Also, if the two arrays contain a different number of values, then which method is faster will depend on whether both arrays need to be sorted or not. Two times sort() is a bit slower than one time array_diff(), but if one of the arrays have already been sorted, then you only have to sort the other array and this will be almost twice as fast as array_diff().

Basically: 2 x sort() is slower than 1 x array_diff() is slower than 1 x sort().

It’s important to note that array_diff() is NOT a fast or memory-efficient function on larger arrays.

In my experience, when I find myself running array_diff() on larger arrays (50+ k/v/pairs) I almost always realize that I’m working the problem from the wrong angle.

Typically, when reworking the problem to not require array_diff(), especially on bigger datasets, I find significant performance improvements and optimizations.

If you’re not getting a count(array_diff($a1,$a2))>0 with something similar to the following arrays should use the php.net/array_diff_assoc function instead.

There is more fast implementation of array_diff, but with some limitations. If you need compare two arrays of integers or strings you can use such function:

10x faster than array_diff

Here is some code to take the difference of two arrays. It allows custom modifications like prefixing with a certain string (as shown) or custom compare functions.

I always wanted something like this to avoid listing all the files and folders you want to exclude in a project directory.

$relevantFiles = array_diff(scandir(‘somedir’), array(‘.’, ‘..’, ‘.idea’, ‘.project));

As touched on in kitchin’s comment of 19-Jun-2007 03:49 and nilsandre at gmx dot de’s comment of 17-Jul-2007 10:45, array_diff’s behavior may be counter-intuitive if you aren’t thinking in terms of set theory.

array_diff() returns a *mathematical* difference (a.k.a. subtraction) of elements in array A that are in array B and *not* what elements are different between the arrays (i.e. those that elements that are in either A or B but aren’t in both A and B).

Drawing one of those Ven diagrams or Euler diagrams may help with visualization.

As far as a function for returning what you may be expecting, here’s one:

Resubmitting. the update for takes into account comparison issues

Computes the difference of all the arrays

I’ve found a way to bypass that. I had 2 arrays made of arrays.
I wanted to extract from the first array all the arrays not found in the second array. So I used the serialize() function:

Yes you can get rid of gaps/missing keys by using:

Note that array_diff is not equivalent to

The difference is made only on the first level. If you want compare 2 arrays, you can use the code available at https://gist.github.com/wrey75/c631f6fe9c975354aec7 (including a class with an function to patch the array)

Here the basic function:

A simple multidimentional key aware array_diff function.

Based on one lad’s code, I created following function for creating something like HTML diff. I hope it will be useful.

Hi!
I tried hard to find a solution to a problem I’m going to explain here, and after have read all the array functions and possibilities, I had to create what I think should exist on next PHP releases.

What I needed, it’s some kind of Difference, but working with two arrays and modifying them at time, not returning an array as a result with the diference itself.

so basically, I wanted to delete coincidences on both arrays.

Now, I’ve some actions to do, and I know wich one I’ve to do with the values from one array or another.
With the normal DIFF I can’t, because if I’ve an array like C=1,4, I dont know if I’ve to do the Action_A with 1 or with 4, but I really know that everything in A, will go to the Action_A and everithing in B, will go to Action_B. So same happens with 4, don’t know wich action to apply.

So a call to this will be somethin’ like:

Now, why I use it precisely?

Imagine you’ve some «Events» and some users you select when create the event, can «see» this event you create. So you «share» the event with some users. Ok?

Imagine you created and Event_A, and shared with users 1,2,3.

Now you want to modify the event, and you decide to modify the users to share it. Imagine you change it to users 2,3,4.

(numbers are users ID).

So you can manage when you are going to modify, to have an array with the IDs in DDBB ($original), and then, have another array with ID’s corresponding to the users to share after modifying ($new). Wich ones you’ve to DELETE from DDBB, and wich ones do you’ve to INSERT?

If you do a simple difference or somehow, you get somethin’ like C=1,4.
You have no clue on wich one you’ve to insert or delete.

But on this way, you can know it, and that’s why:

I hope you find it useful, and I encourage PHP «makers», to add in a not distant future, somethin’ like this one natively, because I’m shure that I’m not the first one needing something like this.

Источник

Функции для работы с массивами

Содержание

User Contributed Notes 14 notes

A simple trick that can help you to guess what diff/intersect or sort function does by name.

Example: array_diff_assoc, array_intersect_assoc.

Example: array_diff_key, array_intersect_key.

Example: array_diff, array_intersect.

Example: array_udiff_uassoc, array_uintersect_assoc.

This also works with array sort functions:

Example: arsort, asort.

Example: uksort, ksort.

Example: rsort, krsort.

Example: usort, uasort.

?>
Return:
Array ( [ 0 ] => Cero [ 1 ] => Uno [ 2 ] => Dos [ 3 ] => Cuatro [ 4 ] => Cinco [ 5 ] => Tres [ 6 ] => Seis [ 7 ] => Siete [ 8 ] => Ocho [ 9 ] => Nueve [ 10 ] => Diez )
Array ( [ 0 ] => Cero [ 1 ] => Uno [ 2 ] => Dos [ 3 ] => Tres [ 4 ] => Cuatro [ 5 ] => Cinco [ 6 ] => Seis [ 7 ] => Siete [ 8 ] => Ocho [ 9 ] => Nueve [ 10 ] => Diez )
?>

Updated code of ‘indioeuropeo’ with option to input string-based keys.

Here is a function to find out the maximum depth of a multidimensional array.

// return depth of given array
// if Array is a string ArrayDepth() will return 0
// usage: int ArrayDepth(array Array)

Short function for making a recursive array copy while cloning objects on the way.

If you need to flattern two-dismensional array with single values assoc subarrays, you could use this function:

to 2g4wx3:
i think better way for this is using JSON, if you have such module in your PHP. See json.org.

to convert JS array to JSON string: arr.toJSONString();
to convert JSON string to PHP array: json_decode($jsonString);

You can also stringify objects, numbers, etc.

Function to pretty print arrays and objects. Detects object recursion and allows setting a maximum depth. Based on arraytostring and u_print_r from the print_r function notes. Should be called like so:

I was looking for an array aggregation function here and ended up writing this one.

Note: This implementation assumes that none of the fields you’re aggregating on contain The ‘@’ symbol.

While PHP has well over three-score array functions, array_rotate is strangely missing as of PHP 5.3. Searching online offered several solutions, but the ones I found have defects such as inefficiently looping through the array or ignoring keys.

Источник

Сравнить ключи массивов

2 массив такого вида, но данные всегда разные

Помощь в написании контрольных, курсовых и дипломных работ здесь.

Ключи глобальных массивов в кавычках или без?
Доброго времени суток! Как правильно записывать ключи (правильно ли их называть ключами?) в.

Как сравнить значение и ключ двух массивов в PHP?
Всем привет! Начал изучать PHP, хочу написать скрипт, который через форму методом GET передает.

Сравнить несколько массивов
сравнить несколько массивов вывести тот в котором наибольшее количество совпадений.

Задача: Сравнить ячейки массивов
Прошу помочь сделать задачи! буду очень благодарен! Заранее огромное спасибо! 1. Сравнить ячейки.

У меня как-то вот так сработало

Azdeman, никогда не видел запись таким способом.
Как ее правильно читать?

Добавлено через 1 минуту
это эквивалент

Добавлено через 2 минуты
и еще просьба:
прокомментируйте, плз, мой чудо-код. бред или будет работать в данном случае.

Да и у у вас вариант годный, проверяем расхождение ключей в массивах. что еще сказать, сравнивает ключи первого массива с ключами 2-го. и на выходе ключи 1 массива которых нет в 2-м массиве.

Только как мне показало не по заданию совсем.. в задании же не расхождения узнать. а как раз таки узнать совпадения и добавить в новый массив ключи 2 го массива.

неправильно задачу поставила

здесь 8 и 9 элемент различаются, значит 9 ключ нужно тоже добавить в третий массив. но при этом возможет второй массив вида

здесь различаются 11 и 12 элемент, значит в третий массив нужно добавить 12 элемент.
при всем этом нужно сравнивать все это с первым массивом на соответствие ключей.

Добавлено через 5 минут
как вариант можно сначала пройтись по второму массиву, записать ключи, которые поменялись, потом сравнить их с ключами первого массива и записать в третий

Добавлено через 5 минут
т.е. ключи сходятся постоянно, значения расходятся. а схождение ключей нужно проверять у 1 и 2 массива

Источник

array_keys

(PHP 4, PHP 5, PHP 7, PHP 8)

array_keys — Возвращает все или некоторое подмножество ключей массива

Описание

Список параметров

Массив, содержащий возвращаемые ключи.

Если указано, будут возвращены только ключи у которых значения элементов массива совпадают с этим параметром.

Определяет использование строгой проверки на равенство (===) при поиске.

Возвращаемые значения

Примеры

Пример #1 Пример использования array_keys()

Результат выполнения данного примера:

Смотрите также

User Contributed Notes 28 notes

It’s worth noting that if you have keys that are long integer, such as ‘329462291595’, they will be considered as such on a 64bits system, but will be of type string on a 32 bits system.

?>

will return on a 64 bits system:

but on a 32 bits system:

I hope it will save someone the huge headache I had 🙂

Here’s how to get the first key, the last key, the first value or the last value of a (hash) array without explicitly copying nor altering the original array:

Since 5.4 STRICT standards dictate that you cannot wrap array_keys in a function like array_shift that attempts to reference the array.

Invalid:
echo array_shift( array_keys( array(‘a’ => ‘apple’) ) );

But Wait! Since PHP (currently) allows you to break a reference by wrapping a variable in parentheses, you can currently use:

echo array_shift( ( array_keys( array(‘a’ => ‘apple’) ) ) );

However I would expect in time the PHP team will modify the rules of parentheses.

There’s a lot of multidimensional array_keys function out there, but each of them only merges all the keys in one flat array.

Here’s a way to find all the keys from a multidimensional array while keeping the array structure. An optional MAXIMUM DEPTH parameter can be set for testing purpose in case of very large arrays.

NOTE: If the sub element isn’t an array, it will be ignore.

output:
array(
‘Player’ => array(),
‘LevelSimulation’ => array(
‘Level’ => array(
‘City’ => array()
)
),
‘User’ => array()
)

array (size=4)
0 => string ‘e’ (length=1)
1 => int 1
2 => int 2
3 => int 0

—-
expected to see:
dude dude dude

Sorry for my english.

I wrote a function to get keys of arrays recursivelly.

Here’s a function I needed to collapse an array, in my case from a database query. It takes an array that contains key-value pairs and returns an array where they are actually the key and value.

?>

Example usage (pseudo-database code):

= db_query ( ‘SELECT name, value FROM properties’ );

/* This will return an array like so:

/* Now this array looks like:

?>

I found this handy for using with json_encode and am using it for my project http://squidby.com

This function will print all the keys of a multidimensional array in html tables.
It will help to debug when you don?t have control of depths.

An alternative to RQuadling at GMail dot com’s array_remove() function:

The position of an element.

One can apply array_keys twice to get the position of an element from its key. (This is the reverse of the function by cristianDOTzuddas.) E.g., the following may output «yes, we have bananas at position 0».

Hope this helps someone.

# array_keys() also return the key if it’s boolean but the boolean will return as 1 or 0. It will return empty if get NULL value as key. Consider the following array:

Array
(
[ 0 ] => first_index
[ 1 ] => 1
[ 2 ] => 0
[ 3 ] => 4
[ 4 ] => 08
[ 5 ] => 8
[ 6 ] =>
)

This function will extract keys from a multidimensional array

Array
(
[color] => Array
(
[1stcolor] => blue
[2ndcolor] => red
[3rdcolor] => green
)

[size] => Array
(
[0] => small
[1] => medium
[2] => large
)

Array
(
[0] => color
[1] => 1stcolor
[2] => 2ndcolor
[3] => 3rdcolor
[4] => size
[5] => 0
[6] => 1
[7] => 2
)

All the cool notes are gone from the site.

Here’s an example of how to get all the variables passed to your program using the method on this page. This prints them out so you can see what you are doing.

Simple ways to prefixing arrays;

[1] => Array
(
[product_id] => 2
[product_name] => Bar
)

I was looking for a function that deletes either integer keys or string keys (needed for my caching).
As I didn’t find a function I came up with my own solution.
I didn’t find the propiest function to post to so I will post it here, hope you find it useful.

?>

You can of course define constants to have a nicer look, I have chosen these: EXTR_INT = 1; EXTR_STRING = 2
EXTR_INT will return an array where keys are only integer while
EXTR_STRING will return an array where keys are only string

A needed a function to find the keys which contain part of a string, not equalling a string.

Источник