How to convert ascii code to numerical value in php

php method to convert ascii to numerical value: 1. Create a php sample file; 2. Define an "ascii_to_number" method; 3. Convert characters into ASCII code through the "ord()" function in the method body , the code is such as "ord($string{$i)"; 4. Use a for loop to convert the ASCII code into a numerical value.

Operating system for this tutorial: Windows 10 system, PHP 8.1 version, Dell G3 computer

In PHP programming, ASCII code is a A very important encoding method. It is the standard encoding method used to represent characters in computer systems. When we need to process characters or operate strings in PHP, we must understand how to convert ASCII codes into numerical values ​​so that we can better complete our programming tasks.

The ASCII code table contains a total of 128 characters. These characters are represented by integers from 0 to 127. These integers are represented as a byte internally in the computer and can be read directly when using characters. Retrieval and processing. ASCII characters are used in PHP to complete many regular character processing tasks, such as string conversion, character replacement, etc. Numeric values ​​are needed to represent ASCII codes, so we need to understand how to convert ASCII codes into numerical values.

The following is the method of converting ASCII code to numerical value in PHP code:

function ascii_to_number($string)
{
    $length = strlen($string);
    $x = 0;
    for ($i = 0; $i < $length; $i++) {
        $x = ($x * 128) + ord($string{$i});
    }
    return $x;
}

First create a PHP sample file, then define an "ascii_to_number" method, and pass the "ord()" function in the method body Convert characters into ASCII codes. The code is such as "ord($string{$i)". Use a for loop to convert the ASCII codes into numerical values.

Then we can test the actual application effect of this function through the following code:

$string = "Hello World!";
$number = ascii_to_number($string);
echo "The ASCII number of '{$string}' is: {$number}";

In this test code, we use this function to convert the characters in the string "Hello World!" Convert to the corresponding ASCII code and calculate its value. Finally we use the echo statement to output the results to the screen.

Through the output of the above code, we can see that the function calculated the value corresponding to the string "Hello World!" and output it to the screen, which shows that the function successfully completed the ASCII The operation of converting code to numerical value.

Recommended study: "php video tutorial"

The above is the detailed content of How to convert ascii code to numerical value in php. For more information, please follow other related articles on the PHP Chinese website!