How to make an array display only numeric values ​​in php

In PHP, array is a very useful data type. Usually, we need to store and operate a series of data through these arrays. In PHP, arrays can store different types of data, including strings, numbers, Boolean types, etc. In the process of processing arrays, we may need to display the numeric values ​​​​in the array without displaying other types of data. At this time, we can use some special PHP functions to achieve this function.

1. Use the print_r function

The print_r function is a very commonly used function in PHP. It can display a variable as an easy-to-understand string. When working with arrays, the print_r function can be used to display the numeric values ​​in the array.

Example:

<?php
$arr = [&#39;name&#39; => 'Tom', 'age' => 18, 'score' => 98];
print_r($arr['score']); 
?>

In the above example, we defined an array $arr to save various information of a student. The print_r function is used to display the value corresponding to the score key in the $arr array, which is the student's score.

2. Use foreach loop

In addition to using the print_r function, we can also use foreach loop to traverse the entire array and display the numerical values ​​​​in the array.

Example:

<?php
$arr = [&#39;name&#39; => 'Tom', 'age' => 18, 'score' => 98];
foreach ($arr as $key => $value) {
    if (is_numeric($value)) {
        echo $value . ' ';
    }
}
?>

In the above example, we use a foreach loop to traverse each element in the $arr array and assign it to the $value variable. In each loop, we check whether the data type of $value is a numeric type (using the is_numeric function to determine), and if it is a numeric type, display it.

3. Use the array_filter function

PHP provides a very powerful array function array_filter, which allows us to filter the elements in the array and can easily filter the numeric values ​​in the array. of filtering.

Example:

<?php
$arr = [&#39;name&#39; => 'Tom', 'age' => 18, 'score' => 98];
$nums = array_filter($arr, 'is_numeric');
print_r($nums);
?>

In the above example, we use the array_filter function to filter the elements in the array $arr. The second parameter of the function is the callback function of the filter. The is_numeric function is used here to determine whether the element is of numeric type. Finally, only elements of numeric type are saved to the new array $nums, and the numbers in the $nums array can be output through the print_r function.

The above are some common methods for processing array numeric values ​​in PHP. For different scenarios and needs, you can choose the most suitable method for processing. Consolidating these knowledge points can enable us to operate PHP arrays more skillfully.

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