Using php variables in sql from different php blocks (Undefined variable: xxxx) -


i following this tutorial on how modify sql database. seems fine in when run code below error saying undefined index in line 11 , 12 not defined. can point mistake? can use variable 1 block in another?(the guy in tutorial does)

<?php include '/connection.php'; if(!isset($_post['submit'])){ $query="select * shop id=$_get[id]"; $result=mysqli_query($conn,$query)or die(mysqli_error($conn)); $shop=mysqli_fetch_array($result); } ?> <form action="modify.php" method="post">     <input name="name" value="<?php echo $shop['name']; ?>">  //error here      <input name="city" value="<?php echo $shop['city']; ?>">  //and here     <input type="hidden" name="id"  value="<?php echo $_get['id']; ?>">     <input type="submit" name=submit value="modify"> </form> <?php  if(isset($_post['submit'])){ $q1="update shop set name='$_post[name]',city='$_post[city]' id=$_post[id]";    mysqli_query($conn,$q1)or die(mysqli_error($conn)); } ?>

try read , use parametrized queries (pdi or mysqli) these vulnerable sql injection.

you need define $shop=array("shop"=>"","city"=>""); on top of page: 

<?php     include '/connection.php';     $shop=array("shop"=>"","city"=>"");     if(!isset($_post['submit'])){     $query="select * shop id=$_get[id]";     $result=mysqli_query($conn,$query)or die(mysqli_error($conn));     $shop=mysqli_fetch_array($result);     }     ?>     <form action="modify.php" method="post">         <input name="name" value="<?php echo $shop['name']; ?>">  //error here          <input name="city" value="<?php echo $shop['city']; ?>">  //and here         <input type="hidden" name="id"  value="<?php echo $_get['id']; ?>">         <input type="submit" name=submit value="modify">     </form>     <?php      if(isset($_post['submit'])){     $q1="update shop set name='$_post[name]',city='$_post[city]' id=$_post[id]";        mysqli_query($conn,$q1)or die(mysqli_error($conn));     }     ?>

or can put isset this:

<?php     include '/connection.php';      if(!isset($_post['submit'])){     $query="select * shop id=$_get[id]";     $result=mysqli_query($conn,$query)or die(mysqli_error($conn));     $shop=mysqli_fetch_array($result);     }     ?>     <form action="modify.php" method="post">         <input name="name" value="<?php if(isset($shop['name'])) echo $shop['name']; ?>">  //error here          <input name="city" value="<?php if(isset($shop['city'])) echo $shop['city']; ?>">  //and here         <input type="hidden" name="id"  value="<?php echo $_get['id']; ?>">         <input type="submit" name=submit value="modify">     </form>     <?php      if(isset($_post['submit'])){     $q1="update shop set name='$_post[name]',city='$_post[city]' id=$_post[id]";        mysqli_query($conn,$q1)or die(mysqli_error($conn));     }     ?>

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