How to accurately convert PHP string to ASCII code

《How to accurately convert PHP strings to ASCII codes requires specific code examples》

In the field of programming, ASCII (American Standard Code for Information Interchange) codes are A standard encoding system used to represent characters in computer systems. In PHP, we often need to convert strings into ASCII codes for some operations or processing. The following will introduce how to accurately convert strings to ASCII codes in PHP and give specific code examples.

First of all, the PHP built-in function ord() can be used to obtain the ASCII code value of a certain character in a string. The following is a simple sample code:

$string = "Hello World";
$asciiArray = [];
for ($i = 0; $i < strlen($string); $i++) {
    $asciiValue = ord($string[$i]);
    $asciiArray[] = $asciiValue;
}

echo "字符串 '{$string}' 转换为ASCII码为：";
foreach ($asciiArray as $ascii) {
    echo $ascii . " ";
}

The above code first defines a string $string, and then loops through each character in the string, using ord( )The function gets the ASCII code value of each character, stores it in an array, and finally prints out the converted ASCII code value.

In addition to the ord() function, PHP also provides the chr() function, which can be used to convert the ASCII code value back to the corresponding character. The following is a sample code:

$asciiCode = 65;
$character = chr($asciiCode);

echo "ASCII码 {$asciiCode} 对应的字符为：{$character}";

In the above code, an integer $asciiCode is defined, and then the chr() function is used to convert the ASCII code value to the corresponding characters and print the result.

In summary, PHP provides convenient built-in functions ord() and chr() to realize the mutual conversion between strings and ASCII codes. Through these functions , we can easily perform conversion operations between characters and ASCII codes. In actual development, these functions are very practical and can help us better process string data.

I hope the above specific code examples about converting PHP strings to ASCII codes can help you. Happy programming!

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