How to convert numbers to uppercase English letters in php

In PHP, you can use the chr() function to convert numbers into uppercase English letters. This function can convert decimal ASCII values ​​into corresponding characters. The syntax is "chr($num)"; parameter " The value range of $num" is 65 to 90 (including 65 and 90), corresponding to 26 uppercase English letters.

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php converts numbers Method to convert uppercase English letters

In PHP, you can use the chr() function to convert numbers to uppercase English letters.

chr($num)

chr() function can convert the specified ASCII value into the corresponding character.

ASCII values ​​can be specified as decimal, octal, or hexadecimal values. Octal values ​​are defined with leading 0 and hexadecimal values ​​are defined with leading 0x.

The ASCII value range between 65 and 90 corresponds to 26 uppercase English letters; therefore, if you want to convert numbers to uppercase English letters, you need to ensure that the specified number is greater than 64 and less than 91.

Example:

<?php 
$num=72;
if($num>64&&$num<91){
	echo chr($num);
}else{
	echo "指定数字无法转为大写英文字母";
}

?>

If we set $num to 104 (corresponding to h characters), it is not in the range of 65 to 90 time, so the output is:

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