- substr: documentation ( source)
- is_numeric: documentation ( source)
- explode: documentation ( source)
<?php
$string = "Course_13_Laravel_Batch_15_Day_22";
$dim = explode("_", $string);
$str = "";
foreach($dim as $item){
if(is_numeric( $item)){
$str = $str."-".substr($item, 0, 2);
}else{
$str = $str."-".substr($item, 0, 1);
}
}
$str = substr($str,1);
echo $str;