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. In this example, $filtered contains all elements of the $inputs array except for the element whose key is password. Print_r($filtered) Code language: HTML, XML ( xml ) In this case, you can pass ARRAY_FILTER_USE_KEY as the third argument of the array_filter() function. Sometimes, you want to pass the key, not value, to the callback function. ) Code language: PHP ( php ) Passing elements to the callback functionīy default, the array_filter() function passes the value of each array element to the callback function for filtering. Print_r($positives) Code language: HTML, XML ( xml ) $positives = array_filter($numbers, new Positive()) You can pass an instance of the Positive class to the array_filter() function for including only positive numbers in the result array. In this example, the Positive class has the _invoke() magic method that returns true if the argument is positive otherwise, it returns false. To filter out all the odd numbers in the $numbers array, you use the array_filter() function as follows: 0 Let’s take some examples to understand the array_filter() function better. If the callback function returns true, the array_filter() function includes the element in the result array. The array_filter() function iterates over the elements of the $array and passes each element to the $callback function. The following ilustrates the syntax of the array_filter() function: array_filter ( The array_filter() function allows you to filter elements of an array using a callback function. The array_filter() function makes the code less verbose and more expressive: $number % 2 = 1 The following example uses the foreach statement to iterate over the elements of the $numbers array and filter the odd numbers: 1 When you want to filter elements of an array, you often iterate over the elements and check whether the result array should include each element. Introduction to PHP array_filter() function Summary: in this tutorial, you’ll learn how to use the PHP array_filter() function to filter elements of an array using a callback function.
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