- end: documentation ( source)
- explode: documentation ( source)
- current: documentation ( source)
<?php
$a=array('0.txt','1.txt','2.txt','3.txt');
$n=(int)current(explode('.',end($a)));
echo $n+=1;
$a[]=$n.txt;
$n=(int)current(explode('.',end($a)));
echo $n+=1;
$a[]=$n.txt;
$n=(int)current(explode('.',end($a)));
echo $n+=1;
$a[]=$n.txt;
?>