What is PHP array_filter() and its use?
The array_filter() function in PHP is used to filter the elements of an array based on a certain condition or criteria. It applies a callback function to each element of the array, and any element for which the callback function returns true will be included in the filtered array.
The function takes two parameters: the array to be filtered, and the callback function. The callback function takes one argument, which is the current element of the array, and it should return a Boolean value (true or false) indicating whether the element should be included in the filtered array or not.
Here is an example of how array_filter() can be used:
$numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
$evenNumbers = array_filter($numbers, function($item) {
return $item % 2 == 0;
});
In this example, array_filter() is used to filter all even numbers from an array of integers, the callback function checks if the current element is divisible by 2, if it's the case it returns true, otherwise it returns false. As a result $evenNumbers contains [2, 4, 6, 8, 10].
Another example is filtering an array of strings where it will only return the strings that are longer than a specific number of characters
$words = ['Hello', 'world', '!', 'this', 'is', 'a', 'sentence'];
$longWords = array_filter($words, function($item) {
return strlen($item) > 3;
});
In this example, the callback function checks the length of the current element, if it's greater than 3 it returns true otherwise it returns false, as a result $longWords contains ['Hello', 'world', 'sentence']
array_filter() is particularly useful when you have a large array and want to extract a subset of
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