Php obtains the file extension three methods. Copy the code as follows :? Php Method 1: functionextend_1 ($ file_name) {$ retval; $ ptstrrpos ($ file_name ,.); if ($ pt) $ retvalsubstr ($ file_name, $ pt + 1, strlen ($ file_name)-$ pt );
The code is as follows:
// Method 1:
Function extend_1 ($ file_name)
{
$ Retval = "";
$ Pt = strrpos ($ file_name ,".");
If ($ pt) $ retval = substr ($ file_name, $ pt + 1, strlen ($ file_name)-$ pt );
Return ($ retval );
}
// Method 2
Function extend_2 ($ file_name)
{
$ Extend = pathinfo ($ file_name );
$ Extend = strtolower ($ extend ["extension"]);
Return $ extend;
}
// Method 3
Function extend_3 ($ file_name)
{
$ Extend = explode (".", $ file_name );
$ Va = count ($ extend)-1;
Return $ extend [$ va];
}
?>
The http://www.bkjia.com/PHPjc/317049.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/317049.htmlTechArticle code is as follows :? Php // Method 1: functionextend_1 ($ file_name) {$ retval = ""; $ pt = strrpos ($ file_name ,". "); if ($ pt) $ retval = substr ($ file_name, $ pt + 1, strlen ($ file_name)-$ pt );...