/**
Leaving only the first and last characters string *, * hiding place with intermediate (only when the first two characters)
* @Param string $ user_name Name
* After @return string formatted name
*/
function substr_cut($user_name){
$strlen = mb_strlen($user_name, 'utf-8');
$firstStr = mb_substr($user_name, 0, 1, 'utf-8');
$lastStr = mb_substr($user_name, -1, 1, 'utf-8');
if($strlen<2) {
return $user_name;
}
else {
return $strlen == 2 ? $firstStr . str_repeat('*', mb_strlen($user_name, 'utf-8') - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
}
}