A simple guide to converting ASCII values ​​in PHP

A simple guide to convert ASCII to numerical value in PHP

In the process of programming development, it often involves converting ASCII code into the corresponding numerical value. In PHP, it is not complicated to convert ASCII values. The following will introduce you to the specific steps and code examples.

Step 1: Understand the ASCII code

ASCII (American Standard Code for Information Interchange) is an encoding standard for displaying text, which maps each character to a specific integer value. In ASCII encoding, letters, numbers and symbols have corresponding numerical representations.

Step 2: How to convert ASCII to a numerical value

In PHP, you can use the ord() function to convert a character to its ASCII value. The syntax of the ord() function is as follows:

int ord ( string $string )

This function accepts a character as a parameter and returns the corresponding ASCII value. Next, we will use a simple example to demonstrate how to convert a character to its ASCII value.

<?php
$char = 'A';
$asciiValue = ord($char);
echo "字符 {$char} 的ASCII值是：{$asciiValue}";
?>

Running the above code will output:

字符 A 的ASCII值是：65

Through the above code example, it can be seen that converting a character to its ASCII value is very simple.

Step Three: Batch Convert Strings

In addition to the conversion of single characters, sometimes we need to batch convert all characters in a string. In this case, we can achieve batch conversion by looping through each character of the string.

The following is a sample code that demonstrates how to batch convert all characters in a string to their ASCII values:

<?php
$string = "Hello, World!";
$asciiString = "";
for($i = 0; $i < strlen($string); $i++){
    $asciiString .= ord($string[$i]) . " ";
}

echo "字符串 {$string} 的ASCII值分别为：{$asciiString}";
?>

Run the above code, it will output:

字符串 Hello, World! 的ASCII值分别为：72 101 108 108 111 44 32 87 111 114 108 100 33

Through the above example, you can convert all characters in a string to their ASCII values ​​and output them.

Summary:

Converting ASCII to numerical values ​​in PHP is a basic task, and this conversion process can be easily achieved using the ord() function. Through the sample code provided in this guide, you can become more familiar with and master the operation of converting ASCII values.

I hope this article is helpful to you, if you have any questions about this or need further information, please feel free to contact us.

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