mb_strcut

Here is an example with UTF8 characters, to see how the start and length arguments are working:  $str_utf8 = utf8_encode("Déjà_vu");  $str_utf8_0 = mb_strcut($str_utf8, 0, 4, "UTF-8"); // Déj  $str_utf8_1 = mb_strcut($str_utf8, 1, 4, "UTF-8"); // éj  $str_utf8_2 = mb_strcut($str_utf8, 2, 4, "UTF-8"); // éj  $str_utf8_3 = mb_strcut($str_utf8, 3, 4, "UTF-8"); // jà_  $str_utf8_4 = mb_strcut($str_utf8, 4, 4, "UTF-8"); // à_vThe string includes two special charaters, "é" and "à" internally coded with two bytes.Note that a multibyte character is removed rather than kept in half at the end of the output.Note also that the result is the same for a cut 1,4 and a cut 2,4 with this string.

What the manual and the first commenter are trying to say is that mb_strcut uses byte offsets, as opposed to mb_substr which uses character offsets. Both mb_strcut and mb_substr appear to treat negative and out-of-range offsets and lengths in the basically the same way as substr. An exception is that if start is too large, an empty string will be returned rather than FALSE. Testing indicates that mb_strcut first works out start and end byte offsets, then moves each offset left to the nearest character boundary.

This was driving me crazy, because mb_strcut() kept returning an empty string.  The $length parameter seems to have a max value of 2^32-1 (2147483647).Works:<?php  # output: Полуустав  echo mb_strcut('Полуустав', 0, pow(2,31)-1);?>Doesn't work:<?php  # nothing is output  echo mb_strcut('Полуустав', 0, pow(2,31));?>My PHP_INT_MAX value is much larger than 2^32-1, so I'm not sure why larger values for $length don't work. :(<?php  # output: 9223372036854775807  echo PHP_INT_MAX;?>

diffrence between mb_substr and mb_substrexample:mb_strcut('I_ROHA', 1, 2) returns 'I_'. Treated as byte stream.mb_substr('I_ROHA', 1, 2) returns 'ROHA' Treated as character stream.# 'I_' 'RO' 'HA' means multi-byte character