PHP string length

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    2024-01-11T18:05:19+00:00

    This question is about how to determine the length of a string in PHP.

    In PHP, the length of a string can be determined using the strlen() function. This function returns the number of bytes in a given string. It's important to note that strlen() returns the number of bytes rather than the number of characters in a string, which can be different if the string contains multi-byte characters (such as characters in UTF-8 encoding).

    Here's a basic example of how to use strlen():

    $string = "Hello, world!";
    $length = strlen($string);
    echo "The length of the string is: $length";
    

    This code will output the length of the string "Hello, world!", which is 13 characters long.

    For strings containing multi-byte characters, it's more appropriate to use the mb_strlen() function, which is part of PHP's multibyte string extension. This function correctly counts the number of characters in a string, even if it contains multi-byte characters.

    Example using mb_strlen():

    $string = "こんにちは"; // Japanese characters
    $length = mb_strlen($string);
    echo "The length of the string is: $length";
    

    This code will output the length of the Japanese string, which is 5 characters long.

    In summary, for most uses, strlen() is sufficient to get the length of a string in PHP. However, for strings with multi-byte characters (like UTF-8 encoded strings), mb_strlen() is the better choice to accurately count the number of characters.

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