Function to solve the problem of Chinese and English string length_PHP tutorial

function strSplit($s, $len) {
$end = '...';
$result = '';
$strLen = strlen($s);
if ($strLen <= $len) {
return $s;
}
$len -= 2;
for ($i=0; $i<$len && $i<$strLen; $i++) {
$c = $s[$i];
if (ord( $c) < 0x80) {
$result .= $c;
} elseif ($i+1<$len) {
$result .= $s[$i++] . $s[ $i];
}
}
return ($i < $strLen) ? ($result . $end) : $result;
}

echo strSplit(' 1234567', 10), '
';
echo strSplit('1234567890', 10), '
'; ), '
';
echo strSplit('All are in Chinese', 10), '
';
echo strSplit('All a and b are c d中文', 10), '
';

Output:
1234567
1234567890
1234 Chinese...
All are...
All a and all b...