How to convert numerical value to ascii in php

php method to convert numbers to ascii: 1. Create a PHP sample file; 2. Convert numbers to letters through the "function NumToASCII($num) {...}" method.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php convert numerical values ​​into ascii?

PHP Convert numbers to letters ASCII

PHP Convert numbers to letters through ASCII

/**
 * @param int $num
 * @return bool|int $ascii
 */
function NumToASCII($num) {
    if(!isset($num) || !$num || !is_numeric($num)) {
        return false;
    }
    $ascii = $num + 64;
    return chr($ascii);
}

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