Execute PHP Script using HTML Form -

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hello dear why fail learning php, grateful if can me. :'( followed step step here :

http://www.w3schools.com/php/php_mysql_insert.asp

but when click button submit query nothing happen, show blank white screen , dont see new data on database?

enter image description here

<html> <body>  <form action="insert.php" method="post"> firstname: <input type="text" name="firstname"> lastname: <input type="text" name="lastname"> age: <input type="text" name="age"> <input type="submit"> </form>  </body> </html>  
    <?php     $con=mysqli_connect("localhost","root","","garutexpress");     // check connection     if (mysqli_connect_errno())       {       echo "failed connect mysql: " . mysqli_connect_error();       }      $sql="insert persons (firstname, lastname, age)     values     ('$_post[firstname]','$_post[lastname]','$_post[age]')";      if (!mysqli_query($con,$sql))       {       die('error: ' . mysqli_error($con));       }     echo "1 record added";      mysqli_close($con);    ?>

if data successfull added should give echo "1 record added"; never see message.

your table name "persons", not "persons"

when make query, table name has same in database. if in phpmyadmin , table "persons" lowercase

edited according : @i can has cheezburger

please change name of table in code , make sure wrap quotes accordingly : 

  <?php     $con=mysqli_connect("example.com","peter","abc123","my_db");     // check connection     if (mysqli_connect_errno())       {       echo "failed connect mysql: " . mysqli_connect_error();       }        $sql='insert persons (firstname, lastname, age) values ("'.$_post['firstname'].'","'.$_post['lastname'].'","'.$_post['age'].'");      if (!mysqli_query($con,$sql))       {       die('error: ' . mysqli_error($con));       }     echo "1 record added";      mysqli_close($con);    ?>

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