php array remove elements from array
PHP Remove Elements or Values from Array PHP – array_pop
PHP remove element, value from array in PHP. In this tutorial, we will learn how to remove elements/values, array from array in PHP with example.
Here we will learn, how to remove array inside array PHP, remove an element from array PHP, remove the key from associative array PHP, remove array from multidimensional array PHP, how to remove the particular key from an array in PHP, remove array inside array PHP.
To Remove elements,values, and array from array PHP
To remove elements from types of array in PHP:
You can use PHP array_pop() function to removes/deletes the last elements of the end of an array.
Let’s know about the PHP array_pop() function, like array_pop function definition, syntax, and examples:
PHP array_pop() function
The PHP array_pop() function is used to removes/deletes elements to the end of an array.
Syntax
PHP Remove element from array
In this example, we have one array “array(“PHP”, “laravel”, “codeigniter”,”bootstrap”)”, it contains value like (“PHP”, “laravel”, “codeigniter”,” bootstrap “). If we want to remove/delete elements in the array. You can removes/deletes the elements/values into array see below examples:
Remove key from associative array php
Here we will remove/delete the elements/values in the array with the key without using array_pop function.
How to remove key from associative array PHP or how to remove the particular key from an array in PHP:
Remove array from multidimensional array PHP
If we want to remove/delete values/elements in a multi-dimensional array. Here we will take an example to remove/delete the values/elements in a multidimensional array.
If you have a multidimensional array like this:
And you want to remove/delete values/elements inside the array elements. You can use the below example for remove/delete the values/elements in the multidimensional array:
Remove array inside array PHP with key
If we want to remove/delete values/elements in a multi-dimensional array. Here we will take an example to remove/delete the values/elements in a multidimensional array.
If you have a multidimensional array like this:
And you want to remove/delete array inside the array with the key in PHP. You can use the below example for remove/delete array inside array with key:
Conclusion
remove/delete elements/values, array from array in PHP. Here you have learned how to remove array inside array PHP, remove an element from array PHP, remove the key from associative array PHP, remove array from multidimensional array PHP, how to remove the particular key from an array in PHP, remove array inside array PHP.
PHP Remove elements from associative array
I have an PHP array that looks something like this:
When I var_dump the array values i get this:
Is there a way to remove them by matching the value name instead of the key value?
9 Answers 9
Wouldn’t it be a lot easier if your array was declared like this :
That would allow you to use your values of key as indexes to access the array.
Instead, with your array that looks like this :
Why do not use array_diff?
Just note that your array would be reindexed.
/edit As mentioned by JohnP, this method only works for non-nested arrays.
I kinda disagree with the accepted answer. Sometimes an application architecture doesn’t want you to mess with the array id, or makes it inconvenient. For instance, I use CakePHP quite a lot, and a database query returns the primary key as a value in each record, very similar to the above.
Assuming the array is not stupidly large, I would use array_filter. This will create a copy of the array, minus the records you want to remove, which you can assign back to the original array variable.
Although this may seem inefficient it’s actually very much in vogue these days to have variables be immutable, and the fact that most php array functions return a new array rather than futzing with the original implies that PHP kinda wants you to do this too. And the more you work with arrays, and realize how difficult and annoying the unset() function is, this approach makes a lot of sense.
You can use whatever inclusion logic (eg. your id field) in the embedded function that you want.
Remove empty array elements
Some elements in my array are empty strings based on what the user has submitted. I need to remove those elements. I have this:
27 Answers 27
You can use array_filter to remove empty elements:
If you have (int) 0 in your array, you may use the following:
EDIT: Maybe your elements are not empty per se but contain one or more spaces. You can use the following before using array_filter
The most popular answer on this topic is absolutely INCORRECT.
Consider the following PHP script:
Why is this? Because a string containing a single ‘0’ character also evaluates to boolean false, so even though it’s not an empty string, it will still get filtered. That would be a bug.
Passing the built-in strlen function as the filtering function will work, because it returns a non-zero integer for a non-empty string, and a zero integer for an empty string. Non-zero integers always evaluate to true when converted to boolean, while zero integers always evaluate to false when converted to boolean.
So, the absolute, definitive, correct answer is:
array_filter: «If no callback is supplied, all entries of input equal to FALSE will be removed.» This means that elements with values NULL, 0, ‘0’, », FALSE, array() will be removed too.
The other option is doing
which will remove elements with values NULL, » and FALSE.
UPDATE
Here is an example.
Another one liner to remove empty («» empty string) elements from your array.
Or maybe you want to trim your array elements first:
Note: This code also removes null and false elements.
In short:
This is my suggested code:
Explanation:
array_map is for trimming, array_filter is for remove empty values, strlen is for keep 0 value, and array_values is for re indexing if you needed.
Samples:
Results:
Online Test:
If you are working with a numerical array and need to re-index the array after removing empty elements, use the array_values function:
The most voted answer is wrong or at least not completely true as the OP is talking about blank strings only. Here’s a thorough explanation:
What does empty mean?
First of all, we must agree on what empty means. Do you mean to filter out:
How do you filter out the values
To filter out empty strings only:
To only filter out strictly false values, you must use a callback function:
Third and fourth case are (for our purposes at last) equivalent, and for that all you have to use is the default:
For multidimensional array
I had to do this in order to keep an array value of (string) 0
I use the following script to remove empty elements from an array
Just want to contribute an alternative to loops. also addressing gaps in keys.
In my case I wanted to keep sequential array keys when the operation was complete (not just odd numbers, which is what I was staring at. Setting up code to look just for odd keys seemed fragile to me and not future-friendly.)
The combination of array_filter and array_slice does the trick.
No idea on efficiencies or benchmarks but it works.
Just one line : Update (thanks to @suther):
output
use array_filter function to remove empty values:
Remove empty array elements
I think array_walk is much more suitable here
Output:
We made sure that empty values are removed even if the user adds more than one space
We also trimmed empty spaces from the valid values
Finally, only (null), (Boolean False) and (») will be considered empty strings
As for False it’s ok to remove it, because AFAIK the user can’t submit boolean values.
As per your method, you can just catch those elements in an another array and use that one like follows,
try this ** **Example
With these types of things, it’s much better to be explicit about what you want and do not want.
It will help the next guy to not get caught by surprise at the behaviour of array_filter() without a callback. For example, I ended up on this question because I forgot if array_filter() removes NULL or not. I wasted time when I could have just used the solution below and had my answer.
Also, the logic is language angnostic in the sense that the code can be copied into another language without having to under stand the behaviour of a php function like array_filter when no callback is passed.
In my solution, it is clear at glance as to what is happening. Remove a conditional to keep something or add a new condition to filter additional values.
Another benefit of this approach is that you can break apart the filtering predicates into an abstract function that filters a single value per array and build up to a composable solution.
See this example and the inline comments for the output.
Now you can dynamically create a function called filterer() using pipe() that will apply these partially applied functions for you.
How do you remove an array element in a foreach loop?
I want to loop through an array with foreach to check if a value exists. If the value does exist, I want to delete the element which contains it.
I have the following code:
I don’t know how to delete the element once the value is found. How do I delete it?
7 Answers 7
If you also get the key, you can delete that item like this:
A better solution is to use the array_filter function:
As foreach relies on the internal array pointer in PHP 5, changing it within the loop may lead to unexpected behavior.
In PHP 7, foreach does not use the internal array pointer.
Instead of doing foreach() loop on the array, it would be faster to use array_search() to find the proper key. On small arrays, I would go with foreach for better readibility, but for bigger arrays, or often executed code, this should be a bit more optimal:
if you have scenario in which you have to remove more then one values from the foreach array in this case you have to pass value by reference in for each: I try to explain this scenario:
in second loop you want to unset first loops entries dont come again in the iteration for performance purpose or else then unset from memory as well because in memory they present and will come in iterations.
There are already answers which are giving light on how to unset. Rather than repeating code in all your classes make function like below and use it in code whenever required. In business logic, sometimes you don’t want to expose some properties. Please see below one liner call to remove
How can I remove a key and its value from an associative array?
Given an associative array:
How would I go about removing a certain key-value pair, given the key?
7 Answers 7
Example:
Output:
Use this function to remove specific arrays of keys without modifying the original array:
First param pass all array, second param set array of keys to remove.
Consider this array:
To remove an element using the array key :
To remove element by value :
To remove an element by using index :
You may need two or more loops depending on your array:
you can do it using Laravel helpers:
first helper, method Arr::except:
second helper: method Arr::pull
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