


PHP function for intercepting strings of specific length_PHP tutorial
* PHP (as the current mainstream development language) function used to intercept strings of a specific length, while processing Chinese characters.
* Returns the intercepted string; if the string length is less than or If equal to parameter $str_len, the original string is returned.
*
* @access(favorite for small websites) public
* @param string $str The string that needs to be intercepted.
* @param integer $str_len The length of the intercepted string.
* @param string $str_append When the interception operation occurs, the string added at the end of the intercepted string. The default value is
function my_substr($str, $str_len, $str_append = ... ...)
{
if (strlen($str) > $str_len) {
$str_len -= strlen($str_append);
for ($i = $str_len, $j = 0; $i >= 0, ord($str[$i - 1]) > 128; $i--, $j++);;
$str = ($j % 2 != 0)
? substr($str, 0, $str_len - 1).
: substr($str, 0, $str_len); > } //end if
return $str;
} //end function
?>
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