url - Php Redirect to a webpage (html) -

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i've seen use of header in php redirect page.

i've used method in code below , redirect error given below code.

i need know went wrong code.

here code (php) :

<?php /**  * created phpstorm.  * user: priyabrata  * date: 3/18/14  * time: 8:58 pm  */   function connect_to_db($uid, $pass){     $con=mysqli_connect("localhost", "root", "12345", "mydb");     if (mysqli_connect_errno()){         echo "failed establish link!!";     }else{         echo mysqli_connect_error();     }     $result=mysqli_query($con, "select `pwd` `login_table` `uid` = "."'".$uid."'");     if (!$result){         echo "error!!";         exit();     }     while($xx = mysqli_fetch_array($result)){         if ($xx['pwd'] == hash("md5", $pass)){             header("location:../html/login-existing-users1_success.htm");             exit();         }else{             echo "invalid login credentials!!";             exit();         }     }     mysqli_close($con); }  function validate_credentials(){     if ((isset($_post["username"]))&&(isset($_post["password"]))){         $uid = $_post["username"];         $pwd = $_post["password"];         if (($uid == "")||($pwd == "")){             echo "please enter user name , password";         }else{             //check user name , password             connect_to_db($uid, $pwd);         }     }else{         echo "please enter user name , password";     } }  validate_credentials();

here error get, instead of redirect when uploaded server:

warning: cannot modify header information - headers sent (output started @ /home/opticfhb/public_html/helpvssupport.net/login.php:19) in /home/opticfhb/public_html/helpvssupport.net/login.php on line 27

additional info : works in local machine , creates problem in server.

you can't call header() after you've echoed output. http requests contain header information , data. output part of data, , data comes after headers have been sent.

php has function called headers_sent check whether or not headers have been sent or not. might consider writing function issues location header if haven't been, or echo out simple redirect html if have -- perhaps including tag in <head>:

<meta http-equiv="refresh" content="0;http://www.website.com/redirect/url" />

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