PHP function substr() error

use this function, It worked for me

function substr_unicode($str, $s, $l = null) {
    return join("", array_slice(
        preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $s, $l));
}

Credits: http://php.net/manual/en/function.mb-substr.php#107698

Use mb_substr instead, it is able to deal with multiple encodings, not only single-byte strings as substr:

$articleText = mb_substr($articleText,0,500,'UTF-8');

substr is counting using bytes, and not characters.

greek probably means you are using some multi-byte encoding, like UTF-8 -- and counting per bytes is not quite good for those.

Maybe using mb_substr could help, here : the mb_* functions have been created specifically for multi-byte encodings.

Looks like you're slicing a unicode character in half there. Use mb_substr instead for unicode-safe string slicing.

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