- mb_substr: documentation ( source)
- trim: documentation ( source)
- mb_strrpos: documentation ( source)
<?php
$text ='12345 12345 12345 4';
$cut_text=trim(mb_substr($text,0,mb_strrpos(mb_substr($text,0,5,'utf-8'),' ',utf-8),'utf-8'), '\,');
echo $cut_text;