php smarty truncate UTF8 Scrambling Problem Solution

It is estimated that many children who play with the smarty template have encountered the problem of cropping and scrambling.Especially UTF8 encoded.

The following code is saved as modifier.truncate2.php to the plugin directory under smarty libs

Then clip with $v- > content|truncate2:100

That's it.

If unusable may be due to caching, delete templates_quicklyCached files under c (This site encountered caching problems while running.)

<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */

 
/**
 * Smarty truncate modifier plugin
 *
 * Type:     modifier<br>
 * Name:     truncate<br>
 * Purpose:  Truncate a string to a certain length if necessary,
 *           optionally splitting in the middle of a word, and
 *           appending the $etc string or inserting $etc into the middle.
 * @link http://smarty.php.net/manual/en/language.modifier.truncate.php
 *          truncate (Smarty online manual)
 * @author   Monte Ohrt <monte at ohrt dot com>
 * @param string
 * @param integer
 * @param string
 * @param boolean
 * @param boolean
 * @return string
 */
function smarty_modifier_truncate2( $string,$length = 80,$etc='...',$count_words = true ) {
 return $returnstr =substr_utf8($string, 0, $length).$etc; 

}

function substr_utf8($str, $start=0, $length=-1, $return_ary=false) {
    $len = strlen($str);if ($length == -1) $length = $len;
    $r = array();
    $n = 0;
    $m = 0;

    for($i = 0; $i < $len; $i++) {
        $x = substr($str, $i, 1);
        $a = base_convert(ord($x), 10, 2);
        $a = substr('00000000'.$a, -8);
        if ($n < $start) {
            if (substr($a, 0, 1) == 0) {
            }elseif (substr($a, 0, 3) == 110) {
                $i += 1;
            }elseif (substr($a, 0, 4) == 1110) {
                $i += 2;
            }
            $n++;
        }else {
            if (substr($a, 0, 1) == 0) {
                $r[] = substr($str, $i, 1);
            }elseif (substr($a, 0, 3) == 110) {
                $r[] = substr($str, $i, 2);
                $i += 1;
            }elseif (substr($a, 0, 4) == 1110) {
                $r[] = substr($str, $i, 3);
                $i += 2;
            }else {
                $r[] = '';
            }
            if (++$m >= $length) {
                break;
            }
        }
    }

    return $return_ary ? $r : implode("",$r);
}
/* vim: set expandtab: */
?>

samrty's plug-in system is smart and easy to modify.