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GET SUBSTRING OF STRING WITH POSITION

$filename = "abcd.mp4";

if (($pos = strpos($filename, ".")) !== FALSE) {
          $whatIWant = substr($filename, $pos);
echo $whatIWant; // .mp4      
 }

VICEVERSA
 $arr = explode(".", $filename, 2);      
 $first = $arr[0];

***************************************
if (($pos = strpos($filename, ".")) !== FALSE) {  
        
 $extension = substr($filename, $pos);   
    
}      

 if(($arr = explode(".", $filename, 2)) !== FALSE){
           $name = $arr[0];    
 }
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