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PHP: array_filter - Manual

array_reduce() - Iteratively reduce the array to a single value using a callback function · Learn How To Improve This Page • Submit a Pull Request • Report a Bug ... If you like me have some trouble understanding example #1 due to the bitwise operator (&) used, here is an explanation.

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PHP array_filter() Function

Arrays Indexed Arrays Associative ... Arrays Array Functions PHP Superglobals · Superglobals $GLOBALS $_SERVER $_REQUEST $_POST $_GET PHP RegEx PHP RegEx Functions · PHP Form Handling PHP Form Validation PHP Form Required PHP Form URL/E-mail PHP Form Complete · PHP Date and Time PHP Include PHP File Handling PHP File Open/Read PHP File Create/Write PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP Filters ...

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People also ask

How to use php array_filter with a callback function?

$result = array_filter($data, function($value) {
    return $value > 1;
});

This code returns values greater than 3 from the array. The callback decides which items remain.

flatcoding.com › home › php array_filter: how to filter array values with examples

PHP array_filter: How to Filter Array Values with Examples - ...

How to preserve array keys in php array_filter?

$data = ["a" => 1, "b" => 2, "c" => 3]; 
$result = array_filter($data, function($value) {
    return $value > 3;
});
print_r($result);

php array_filter keeps the original array keys by default when filtering values.

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PHP array_filter: How to Filter Array Values with Examples - ...

Can array_filter work without a callback?

$data = [0, 1, false, 2, '', 3];
$result = array_filter($data, function($value) {
    return $value > 3;
});
print_r($result);

Without a callback, php array_filter removes false, null, 0, empty strings, and false values from the array.

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PHP array_filter: How to Filter Array Values with Examples - ...

medium.com › @hbahonar › php-array-filter-function-with-practical-examples-a89b8f2be7c9

PHP array_filter() Function With Practical Examples | by H Bahonar | Medium

May 24, 2023 - $cars = array(1 => 'Ferrari', 2 => 2, 3 => 'BMW'); function findString($value) { return is_string($value); } var_dump(array_filter($cars, 'findString')); ... PHP 5.6 introduced the third parameter to array_filter() called flag, which you could ...

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PHP array_filter Function

April 6, 2025 - To pass both the key and value of the element to the callback function, you pass the ARRAY_FILTER_USE_BOTH value as the third argument of the array_filter() function. For example: <?php $inputs = [ 'first' => 'John', 'last' => 'Doe', 'password' => 'secret', 'email' => '' ]; $filtered = array_filter( $inputs, fn ($value, $key) => $value !== '' && $key !== 'password', ARRAY_FILTER_USE_BOTH ); print_r($filtered);Code language: PHP (php)

w3resource.com › php › function-reference › array_filter.php

PHP : array_filter() function - w3resource

Value Type: Array · Example: <?php ... true; } return false; } $item_list=array("Item1" => 100, "Item2" => 200, "Item3" => 125, "Item4" => 100); print_r(array_filter($item_list,"my_function")); ?> Output: Array ( [Item2] => ...

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PHP array_filter() Function - GeeksforGeeks

June 20, 2023 - array array_filter($array, $callback_function, $flag) Parameters: The function takes three parameters, out of which one is mandatory and the other two are optional.

reintech.io › blog › mastering-php-array-filter-function-for-filtering-arrays

Mastering PHP's `array_filter()` Function for Filtering Arrays | Reintech media

April 14, 2023 - In this tutorial, learn how to master PHP's array_filter() function for filtering arrays. Understand its basic usage, implement custom callback functions, filter arrays by keys, and combine it with other array functions for more complex operations

onlinephp.io › array-filter › manual

array_filter - OnlinePHP.io Example

If no callback is supplied, all empty entries of array will be removed. See empty for how PHP defines empty in this case. ... ARRAY_FILTER_USE_BOTH - pass both value and key as arguments to callback instead of the value Default is 0 which will pass value as the only argument to callback instead.

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benjamincrozat.com › home › blog › php › understanding array_filter() in php

Understanding array_filter() in PHP

November 11, 2023 - array_filter() is a powerful function in PHP. It allows you to filter elements of an array using a callable (a closure for instance).

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PHP array_filter: How to Filter Array Values with Examples - FlatCoding

August 15, 2025 - php array_filter is used to filter array values based on a callback. Click here to learn syntax and usage with examples.

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PHP Array Filter Function

August 3, 2025 - The only note here is that the first parameter is the value, and the second parameter is the key. In this example, we use PHP array_filter() to extract only the even numbers from the $numbers array.

doc.bccnsoft.com › docs › php-docs-7-en › function.array-filter.html

Filters elements of an array using a callback function

<?php $arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4]; var_dump(array_filter($arr, function($k) { return $k == 'b'; }, ARRAY_FILTER_USE_KEY)); var_dump(array_filter($arr, function($v, $k) { return $k == 'b' || $v == 4; }, ARRAY_FILTER_USE_BOTH)); ?>

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PHP array_filter() Function - Scaler Topics

April 1, 2024 - The array_filter() function in PHP is used to iterate over an array and selectively filter its elements based on a callback function. A callback function is a function that is passed as an argument to another function.

Tutorial Republic

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PHP array_filter() Function - Tutorial Republic

Here're some more examples showing ... "b" using the flag parameter: ... <?php // Sample array $numbers = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5); // Filtering numbers array using key $result = array_filter($numbers, ...

stackoverflow.com › questions › 74740131 › array-filter-function-in-function

php - array_filter function in function - Stack Overflow

I would combine array_filter and array_map for this.

$data[] = array("id" => "1", "content" => "Hello");
$data[] = array("id" => "2", "content" => "World");

// filter the data
$data = array_filter($data, fn ($value) => $value['content'] === 'World');

// map the data
$data = array_map(fn ($value)  => ['content' => $value['content']], $data);

// reset indexes
$data = array_values($data);

print_r($data);

Example: https://phpize.online/s/9U

Everything seems to work fine.

<?php

$data = [];
$data[] = array("id" => "1", "content" => "Hello");
$data[] = array("id" => "2", "content" => "World");

$filtered_data = array_filter($data, function($value) {
  return $value['content'] == "World";
});

print_r($filtered_data);

The output is just like expected:

Array ( [1] => Array ( [id] => 2 [content] => World ) )

But if you want to leave only some fields in resulting array, array_filter will not help you (at least without a crutch).
You may want to iterate source array and filter it by yourself.

<?php

$data = [];
$data[] = array("id" => "1", "content" => "Hello");
$data[] = array("id" => "2", "content" => "World");

$filtered_data = [];
foreach($data as $v) {
  if($v['content'] == "World")
    $filtered_data[] = ["content" => $v['content']];
}

print_r($filtered_data);

The output then would be:

Array ( [0] => Array ( [content] => World ) )

tutorialspoint.com › php › php_function_array_filter.htm

PHP - Function array_filter()

... <?php function odd($var) { ... & 1)); } $input1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5); $input2 = array(6, 7, 8, 9, 10, 11, 12); echo "Odd Values:\n"; print_r(array_filter($input1, "odd")); echo "Even Values:\n"; print_r(array_filter($input2, "even")); ?>...

zetcode.com › php-array › array-filter

PHP array_filter - Array Filtering in PHP

This example filters out all odd numbers from an array, keeping only evens. ... <?php $numbers = [1, 2, 3, 4, 5, 6]; $evenNumbers = array_filter($numbers, function($n) { return $n % 2 === 0; }); print_r($evenNumbers);

codexworld.com › home › how to guides › how to filter array by value in php

How to Filter Array by Value in PHP - CodexWorld

January 4, 2023 - Here we’ll provide short PHP code snippets to filter elements of an array that contain a specific value. It will help you to filter an array based on the specific condition. The following example code will filter the elements of an array by value using array_filter() and strpos() functions in PHP.