php - Stripos issues in php4 -

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please have following function contact form, shows following error "fatal error: call undefined function: stripos() in" how can fix it

function checkemail($vemail) {                         $invalidchars ="/:,;" ;                      if(strlen($vemail)<1) return false;                                         //invalid characters                     $atpos = stripos($vemail,"@",1);                                    //first position of @                     if ($atpos != false) $periodpos = stripos($vemail,".", $atpos);         //if @ not found null . position                     ($i=0; $i<strlen($invalidchars); $i++) {                            //check bad characters                          $badchar = substr($invalidchars,i,1);       //pick 1                         if(stripos($vemail,$badchar,0) != false)    //if found                             return false;                     }                     if ($atpos == false)                            //if @ not found                         return false;                            if ($periodpos == "")                           //if . null                         return false;                     if (stripos($vemail,"@@")!=false)               //if @@ found                         return false;                     if (stripos($vemail,"@.") != false)             //@.is found                         return false;                     if (stripos($vemail,".@") !=  false)            //.@ found                         return false;                      return true;                     }

as can see the documentation, stripos() exists in php5. anyways, code doesn't need chack case-insensitive because checks . @ / : , ; - can replace stripos() strpos().

you add own stripos() codebase, wich thoe following (using strtolower() , function_exists()):

if(!function_exists("stripos")){   function stripos($haystack, $needle, $offset = 0){     return strpos(strtolower($haystack), strtolower($needle), $offset)   } }

note basic replacemend , might not give same result real stripos() in each end every case. it's valid basic usage, havn't done broad tests.


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