The ord() function

The ord() function returns the ASCII value of the first character of the string.

Syntax: ord(string);

string – the input string

Example input:

echo ord("Hello");

Example output:

72

The chr() function

chr() returns the character corresponding to an ASCII value

Example inputs:

echo chr(100);
echo "
";
echo chr(101);
echo "
";
echo chr(0101);
echo "
";
echo chr(0XFF);