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stackoverflow.com › questions › 5563152 › check-string-length-in-php

Try the common syntax instead:

if (strlen($message)<140) {
    echo "less than 140";
}
else
    if (strlen($message)>140) {
        echo "more than 140";
    }
    else {
        echo "exactly 140";
    }

Answer from nicola on Stack Overflow

PHP

php.net › manual › en › function.strlen.php

PHP: strlen - Manual

PHP's strlen function behaves differently than the C strlen function in terms of its handling of null bytes ('\0'). In PHP, a null byte in a string does NOT count as the end of the string, and any null bytes are included in the length of the string.

W3Schools

w3schools.com › pHP › func_string_strlen.asp

PHP strlen() Function

❮ PHP String Reference · Return the length of the string "Hello": <?php echo strlen("Hello"); ?> Try it Yourself » · Share Link Copied · The strlen() function returns the length of a string. strlen(string) Return the length of the string ...

Discussions

Check string length in PHP - Stack Overflow

I have a string that is 141 characters in length. Using the following code I have an if statement to return a message if the string is greater or less than 140. libxml_use_internal_errors(TRUE); $... More on stackoverflow.com

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PSA! strlen() does not get the length of the characters in a string, it gets the length of bytes in a string. You can use mb_strlen() in combination with a character encoding to get the character length.

Unfortunately, the mb_* functions don't consistently follow Unicode best practices when it comes to dealing with invalid byte sequences. Let's take the sequence "\xe8\x80\\" for example. This sequence is invalid, because the first byte indicates a three-byte sequence, but the third byte is an ASCII backslash instead of a continuation byte. When a UTF-8 parser reads the first byte, it thinks, "Okay, this'll be a three-byte sequence. Codepoint bits: 1000. Looks good so far." Then, it would read the second byte and think, "Okay, continuation byte. Additional codepoint bits: 000000. Looks good so far." It then reads the third byte and thinks, "Uh oh, this was supposed to be a continuation byte, but it isn't. This is invalid." At this point, a parser following best practices should take the first byte of the sequence, as well as any subsequent bytes that are "valid so far", and interpret that sequence as if it were a Unicode Replacement Character (U+FFFD, or �), and then behave as if the next byte begins a new sequence. In this case, the three-byte string above would be interpreted as a � followed by a backslash. Two characters long. PHP's mb_* functions don't do this consistently. The behavior seems to depend on which function you're using. For example, when mb_strlen() encounters an error anywhere in a three-byte sequence, it seems to behave as if all three bytes were replaced with a replacement character. So, mb_strlen() says the string is only one character long, because it wiped out the backslash. Similarly, mb_strlen("\xf0\xf0\xf0\xf0\xf0\xf0\xf0\xf0") returns 2, whereas a parser following best practices would return 8. There's a reason I used a backslash character in my first example: Carelessly wiping out bytes like this can have security ramifications. That's exactly why the best practices are defined as they are in the Unicode standard. And then there's this kind of inconsistent behavior: mb_strpos("a\xe8ab", 'b', 0, 'utf-8') === 3 mb_strpos("a\xe8\x80ab", 'b', 0, 'utf-8') === 3 mb_strpos("a\xe8\x80\x80ab", 'b', 0, 'utf-8') === 3 mb_strpos("a\xe8\x80\x80\x80ab", 'b', 0, 'utf-8') === 3 mb_strpos("a\xe8\x80\x80\x80\x80ab", 'b', 0, 'utf-8') === 3 mb_substr("a\xe8\x80\x80\x80\x80ab", 3, 1, 'utf-8') === "\x80" mb_substr("a\xe8\x80\x80\x80\x80ab", 5, 1, 'utf-8') === 'b' wat. It looks like mb_strpos() isn't even trying to parse the data. It's just counting the number of non-continuation bytes before the first match of the string. I'm sure that's more efficient, but I sure hope nobody is using this stuff on anything that hasn't already been properly scrubbed of invalid sequences in advance. More on reddit.com

r/PHP

104

September 18, 2018

How to find string length in php with out using strlen()? - Stack Overflow

How can you find the length of a string in php with out using strlen() ? More on stackoverflow.com

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What is the maximum length of a String in PHP? - Stack Overflow

So how big can a $variable in PHP get? I've tried to test this, but I'm not sure that I have enough system memory (~2gb). I figure there has to be some kind of limit. What happens when a string More on stackoverflow.com

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