浅析PHP substr,mb_substr以及mb_strcut的区别和用法

<?php
echo mb_substr('这样一来我的字符串就不会有乱码^_^', 0, 7, 'utf-8');
?>

<?php
echo mb_strcut('这样一来我的字符串就不会有乱码^_^', 0, 7, 'utf-8');
?>

mb_substr
mb_substr() returns the portion of str specified by the start and length parameters.
mb_substr() performs multi-byte safe substr() operation based on number of characters. Position is counted from the beginning of str. First character's position is 0. Second character position is 1, and so on.
mb_strcut
mb_strcut() returns the portion of str specified by the start and length parameters.
mb_strcut() performs equivalent operation as mb_substr() with different method. If start position is multi-byte character's second byte or larger, it starts from first byte of multi-byte character.
It subtracts string from str that is shorter than length AND character that is not part of multi-byte string or not being middle of shift sequence.

<?php
$str = '我是一串比较长的中文-.webjx.';
echo "mb_substr:" . mb_substr($str, 0, 6, 'utf-8');
echo "<br>";
echo "mb_strcut:" . mb_strcut($str, 0, 6, 'utf-8');
?>