How to convert array values ​​into numbers in php

In PHP, array is a very important data structure, which can be used to store a set of related data. Usually, the values ​​in the array are strings or other data types, but sometimes, we need to convert the values ​​in the array into numbers. This article explains how to convert array values ​​into numbers.

Method 1: Use the intval() function

You can use the intval() function in PHP to convert a string into an integer. At the same time, when the string is not purely numeric, the function can also ignore non-numeric characters. Therefore, we can use this function to convert the string values ​​in the array into numbers.

The following is a sample code:

$arr = array('1', '2', '3', '4', '5');
foreach($arr as $key => $value){
  $arr[$key] = intval($value);
}
print_r($arr);

The output is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

In this example, we define an array containing string values. We then use a foreach loop to loop through the array and convert each string value to an integer using the intval() function. Finally, we use the print_r() function to output the converted array.

Method 2: Use type casting

In PHP, use the settype() function to force the type of a variable to a specified type. For example, we can convert a string variable to an integer variable. Similarly, we can also type cast the values ​​in the array.

The following is a sample code:

$arr = array('1', '2', '3', '4', '5');
foreach($arr as $key => $value){
  $arr[$key] = (int) $value;
}
print_r($arr);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

In this example, we also define an array containing string values. We then loop through the array using a foreach and convert each string value to an integer using a type cast. Finally, we use the print_r() function to output the converted array.

Method 3: Use the addition operator

In PHP, strings can be added to numbers. When a string contains only numeric characters, addition converts it to an integer. Therefore, we can use this feature to convert the string values ​​in the array into numbers.

The following is a sample code:

$arr = array('1', '2', '3', '4', '5');
foreach($arr as $key => $value){
  $arr[$key] = $value + 0;
}
print_r($arr);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

In this example, we also define an array containing string values. We then use a foreach loop to loop through the array and convert each string value to a number using addition. Note that the right hand side of the addition operator must be the number 0, otherwise the string value will be converted to a floating point number. Finally, we use the print_r() function to output the converted array.

Summary

This article introduces three methods to convert PHP array values ​​​​to numbers, namely using the intval() function, type casting and addition operations. These methods are very simple and easy to understand, and you can choose any one of them according to your preference. At the same time, in practical applications, these methods can also be mixed and used as needed.

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