How to get the length of a string in PHP?

In PHP, you can use the strlen() function to get the length of a string. This function returns the number of characters in the specified string, including spaces and special characters.

Here is an example:

$str = "Hello World!";
$length = strlen($str);
echo "字符串的长度为：" . $length;

Output:

字符串的长度为：12