Why is it important to use mb_ functions when working with UTF-8 encoded strings in PHP?

When working with UTF-8 encoded strings in PHP, it is important to use mb_ functions because they provide multi-byte aware string functions that can properly handle characters that are encoded using multiple bytes. Using regular string functions can lead to incorrect results or unexpected behavior when working with UTF-8 strings due to the variable length of multi-byte characters. 

// Example of using mb_strlen() to get the length of a UTF-8 string
$utf8String = "Hello, 你好";
$length = mb_strlen($utf8String, 'UTF-8');
echo $length; // Output: 9

Keywords

mb_strlen mb_substr mb_convert_encoding UTF-8 multibyte strings

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