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I am new PHP learner and I wanted to call arrays order by id.But on the top of the page it shows
Notice: Undefined index: id in C:\xampp\htdocs\personal\post.php on line 9

What I have tried:


include "libs/db.php";
include "libs/config.php";
include "function.php";
$db = new database();
$id = $_GET['id'];
$query = "SELECT * from posts WHERE id = '$id'";
$posts = $db->select($query);

<!DOCTYPE html>
<title>W3.CSS Template</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="">
<link rel="stylesheet" href="">
    <link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
body,h1,h2,h3,h4,h5 {font-family: "Raleway", sans-serif}
<body class="w3-light-grey">

<!-- w3-content defines a container for fixed size centered content, 
and is wrapped around the whole page content, except for the footer in this example -->
<div class="w3-content" style="max-width:1400px">

<!-- Header -->
<header class="w3-container w3-center w3-padding-32"> 
  <a href="index.php?container.php"><h1>MY BLOG</h1></a>
  <p>Welcome to the blog of <span class="w3-tag">Programmer</span></p>
 <?php $row = $posts->fetch_array()  ;?>
<!-- Grid -->
<div class="w3-row">

<!-- Blog entries -->
<div class="w3-col l8 s12">
  <!-- Blog entry -->

  <div class="w3-card-4 w3-margin w3-white">
    <img src="images/<?php echo $row['image'];?>" alt="Nature" style="width:100%">
    <div class="w3-container">
      <h3><?php echo $row['title'];?></h3>
      <h5>Posted by Sulaymonov on <span class="w3-opacity"><?php echo formatDate($row['date']);?></span></h5>
    <div class="w3-container">
      <p><?php echo $row ['content'];?></p>
      <div class="w3-row">
        <div class="w3-col m8 s12">

        <div class="w3-col m4 w3-hide-small">
          <p><span class="w3-padding-large w3-right">Comments   <span class="w3-tag">0</span></span></p>

Updated 2-Dec-17 7:02am

1 solution

The culprit is this
$id = $_GET['id'];
and it happens when $_GET['id'] is null. Always validate user's input, for example:
$id = isset($_GET['id']) ? $_GET['id'] : '';
ALEX8998 2-Dec-17 12:29pm
Thanks brother! the problem with id has been fixed! But it still keeps a Fatal error: Call to a member function fetch_array() on a non-object in C:\xampp\htdocs\personal\post.php

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