What is the difference between ASCII and Unicode in PHP?

ASCII is a character encoding standard that uses 7 bits to represent characters, allowing for a total of 128 different characters. Unicode, on the other hand, is a character encoding standard that uses variable bit lengths to represent characters, allowing for a much larger range of characters (over 143,000 in the latest version). In PHP, when working with strings that may contain characters outside of the ASCII range, it is important to use Unicode encoding to ensure proper representation of all characters. 

// Convert a string from ASCII to Unicode in PHP
$asciiString = "Hello, 你好";
$unicodeString = mb_convert_encoding($asciiString, 'UTF-8', 'ASCII');
echo $unicodeString;

Keywords

ASCII Unicode character encoding PHP differences

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