Php code example of how to obtain the filename suffix

How to get the filename suffix in php sample code record several methods that are frequently used in php to get the filename suffix

 "; // Method 2 $ pics = explode ('.', $ pic); echo end ($ pics )."
"; // End () method to obtain the last unit value of the array // The third method $ info = pathinfo ($ pic); echo $ info ['extension']."
"; // Method 4 echo pathinfo ($ pic, PATHINFO_EXTENSION )."
"; // Method 5 $ offset = strrpos ($ pic ,'. '); // calculate the position of the last occurrence of the specified string in the target string echo substr ($ pic, $ offset + 1 );