How to remove false from an array in php

With the development of open source technology, PHP, as a popular programming language, has received widespread attention and application. In the actual development process, arrays in PHP are one of the most common data types, and their powerful flexibility has won a wide range of users. However, sometimes false values ​​may appear in the arrays, and these false values ​​are not what we Required data, so how to remove the false value in the array? This article will use the relevant functions of PHP to explain this problem in detail.

1. array_filter() function

array_filter() is a very convenient function in PHP. Its function is to filter unnecessary data in the array. The use of this function is very simple. It only requires two parameters. The first parameter is the array that needs to be filtered. The second parameter is a callback function that can customize how to filter. The callback function must return a Boolean value, true means to retain the value, false means to filter the value.

The following is a simple example of using the array_filter() function to remove false values ​​in an array:

$arr = array('apple', 'orange', false, 'pear');
$new_arr = array_filter($arr, function($value) {
    return $value !== false;
});

print_r($new_arr);

The output result is:

Array
(
    [0] => apple
    [1] => orange
    [3] => pear
)

As can be seen from the output result, the original The false values ​​in the array $arr have been successfully filtered out.

2. foreach loop

In addition to using the array_filter() function, you can also use the foreach loop to manually traverse the array, and then filter out the false values. The following is a simple example:

$arr = array('apple', 'orange', false, 'pear');
$new_arr = array();
foreach ($arr as $key => $value) {
    if ($value !== false) {
        $new_arr[$key] = $value;
    }
}

print_r($new_arr);

The output result is also:

Array
(
    [0] => apple
    [1] => orange
    [3] => pear
)

It can be seen from the output result that the false value in the original array $arr has been successfully filtered out.

3. array_diff() function

array_diff() function can also be used to filter false values ​​​​in an array. Its function is to return the difference between two arrays, which is acceptable Multiple parameters. The following is an example of using the array_diff() function:

$arr = array('apple', 'orange', false, 'pear');
$falseArr = array(false);
$new_arr = array_diff($arr, $falseArr);

print_r($new_arr);

The output result is also:

Array
(
    [0] => apple
    [1] => orange
    [3] => pear
)

It can be seen from the output result that the false value in the original array $arr has been successfully filtered out .

To sum up, this article mainly introduces three methods of removing false values ​​from arrays in PHP: array_filter() function, foreach loop and array_diff() function. They can all help us quickly and easily remove false values ​​from arrays. The false value improves our development efficiency.

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