Intercepting file extensions in five different ways-PHP source code

Truncate the file suffix in five different ways

/*** Write five methods to get the file suffix name, a very easy exam question */$ filename = 'www character substr (strrchr ($ filename ,'. '), 1); // Intercept first. and then use substr to capture the string starting from 1. then, you can use the pathinfo function to arrange the array $ arr = pathinfo ($ filename ); echo $ arr ['extension']; // method 3 use the strrpos function to find the last one. and then use substr to capture the length of echo substr ($ filename, (strrpos ($ filename ,'. ') + 1); // use arrays to obtain $ ar = explode ('. ', $ filename); echo arra Y_pop ($ ar); // you can use the regular expression echo (preg_replace ('/. *. (. * [^.]. *) */iU ',' \ 1', $ filename); // This function is very useful. For more information, see.