Convert php array value to integer

In PHP, array is a very common data structure that allows us to combine multiple variables together for easier management and use. Sometimes we need to convert the values ​​in an array into integers in order to perform numerical calculations or comparison operations. This article introduces several common methods of converting PHP array values ​​into integers.

1. Use forced type conversion

There are many types of type conversion methods in PHP, among which the simplest and most commonly used is to use forced type conversion. Wrapping the variable with the (int), (integer) or intval() function can force it to be converted to an integer type.

The following is a sample code that uses forced type conversion to convert the values ​​in the PHP array into integers:

<?php
$arr = array("1", "2", "3", "4");
foreach ($arr as $value) {
    $value = (int)$value;
    // 或者 $value = intval($value);
    // 或者 $value = (integer)$value;
    echo $value;
}
?>

The output result is:

1234

Use forced type conversion to convert the values ​​in the array into The method of converting a string type number into an integer type is suitable for simple conversion operations.

2. Use the array_map() function

The array_map() function in PHP can pass each element of one or more arrays to the callback function for processing and return a new array. We can use the array_map() function to convert each element in the array to an integer type.

The following is a sample code that uses the array_map() function to convert the values ​​in a PHP array into integers:

<?php
$arr = array("1", "2", "3", "4");
$arr = array_map('intval', $arr);
print_r($arr);
?>

The output result is:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

Use the array_map() function to convert The method of converting values ​​in an array to an integer type is suitable for situations where each element in the array needs to be processed.

3. Use the array_walk() function

The array_walk() function in PHP can apply a user-defined function to each element in the array. We can use the array_walk() function to convert each element in the array to an integer type.

The following is a sample code that uses the array_walk() function to convert the values ​​in a PHP array into integers:

<?php
$arr = array("1", "2", "3", "4");
array_walk($arr, function(&$value) {
    $value = (int)$value;
});
print_r($arr);
?>

The output result is:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

Use the array_walk() function to convert The method of converting the values ​​in the array into an integer type is suitable for situations where each element in the array needs to be processed and the callback function is relatively complex.

4. Use type declarations

PHP 7 has begun to support type declarations for function parameters and return values, including integer, floating point, Boolean, string types, arrays, and Call types and objects. We can use type declarations in functions to convert parameters into specified data types.

The following is a sample code that uses type declarations to convert array elements into integer types:

<?php
function convertToInt(int ...$arr) : array {
    return $arr;
}
$result = convertToInt("1", "2", "3", "4");
print_r($result);
?>

The output result is:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

Use type declarations to convert the values ​​in the array into Integer type methods are suitable for situations where each value in an array needs to be processed.

Summary

This article introduces several methods to convert PHP array values ​​into integers, including using cast, array_map() function, array_walk() function and type declaration. In actual development, the most appropriate method can be selected based on the required functions and usage scenarios.

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