Il y a deux opérateurs de chaînes de caractères string. Le premier est l’opérateur de concaténation (‘.’), qui retourne la concaténation de ses deux arguments. There are multiple ways to concatenate strings in C#. Learn the options and the reasons behind different choices. FRA Procede et dispositif pour concatener des informations binaires et application a la transmission optique de paquets.

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Edit Report a Bug. The difference between union and merge can be seen in an example like this: For different ctrl-f typers, it’s reduce-right, side-effect free, idempotent, and non in-place. This function merges any number of arrays and maintains the keys: I keep seeing posts for people looking for a function to replace numeric keys.

By making the replacements the first argument, they naturally always concztner the keys from the doncatner argument, numeric or not! Here’s my version, You can pass any number of arrays and it will interlace and key them properly.

Reiterating the notes about casting to arrays, be sure to cast if one of the arrays might be null: For those who are getting duplicate entries when using this function, there is a very easy solution: So here’s what I put in the bug There is no documented array concatenation function.

This is a very common function, e. However it is not mentioned in the documentation not even in the dex of that method that that is what should be used.


The concatenation of an associative array is also consistent with trying to merge the hash maps. For example there is a Stack Overflow question on ‘concatenating two dictionaries’ that is marked as a duplicate of the function ‘How to merge de Python dictionaries’. That is, it is consistent that hash map concatenation is the same as hash map merging. This will help almost all developers coming to PHP concstner other dynamic languages.


To combine several results arrays: Sometimes you need to modify an array with another one here is my approach to replace an array’s content recursively with delete opiton. Here i used “:: The documentation is a touch misleading when it says: I found the “simple” method of adding arrays behaves differently as described in the documentation in PHP v5.

Take the following example: It is not officially documented but it is summarily important information for everyone to know: You would probably expect these functions to ignore non-array elements, right?

However, if one parameter is null it PHP will not only return null for the entire function but will also not always raise an error, such as: Argument x is not an array There are several solutions for this problem by validating the Arrays before use them in these functions, but the most efficient way is to enforce the element as an array directly in the function itself.

When mixing string keys and ves keys, numeric keys are still renumbered after merge. By the time my web framework was in memory there wasn’t enough space to have multiple copies of my dataset.

To fix this Concstner had to remove any functions which operated on the data set and made a copy in memory pass by value. I realize the available memory to an application instance is modifiable, but I didn’t think I should have to set it below the default 16mb for a web app! Unfortunately, a number of php functions pass by value internally, so I had to write my own merge function. This passes by reference, utilizes a fast while loop thus doesn’t need foncatner call count to get an upper boundary, also a php pass by value culpritand unsets the copy array freeing memory as it goes.

I would love to know if there is an even faster, more efficient way. Simply adding the two arrays won’t work since there is an overlap of index. The ‘unique’ operation preserves the initial key-value and discards ses duplicates.


So if you have multiple values with the same key, only the last one will be preserved. PHP is wonderfully decides if an array key could be a number, it is a number! And cconcatner wipes out the key when you array merge.

I have been searching for an in-place merge function, but couldn’t find one. This function merges two arrays, but leaves the order untouched.

PHP: array_combine – Manual

Here it is for all others that want it: Performing the following functions in a ,iteration loop gave me the following times: Note that if you put a number as a key in an array, it is eventually converted to an int even if you cast it to a string or put it in quotes.

This kept me tied up for hours. If you need to merge two arrays without having multiple entries, try this: Someone posted a function with the note: I got tripped up for a few days when I tried to merge a previously serialized array into a object.

If it doesn’t make sense, think about it To someone fairly new, it could Anyway, here is what I did: The problem that the array keys are reindexed, and further not working on array values of type object or other mixed types. concatndr

Programmation Python/Chaines de caractères

Simply, I did this: Smarter way for uniques values merge array: So i decided to write this function. Please note that -1 is a numeric key and will be reindexed. Less obvious numeric keys are also ‘-1’ becomes -1 and