I am echoing the $indicator before $total using if else condition.
But I am getting php error
Notice: Undefined variable: indicator.
How I can achieve this without getting any error and get my result which will be yellow according to the if else condition. Is it possible?
<?php
$total=6;
echo $indicator;
echo $total;
if($total<5) {
$indicator="red";
} else if($total>7) {
$indicator="green";
} else {
$indicator="yellow";
}
?>
Why don't you try like this
UPDATE
<?php
echo myFun();
function myFun(){
$total=6;
if($total<5){
$indicator="red";
}elseif($total>7){
$indicator="green";
}else{
$indicator="yellow";
}
return $indicator = $indicator.$total;
}
Related
I am trying to add values (an input from the user) to an array in a while loop but it won't print it after the loop itself.
<?php
$x = 1;
while(!isset($_POST['stopButton'])) {
$countryArr[$x] = $searchCountry;
$message = "added!";
echo "<script>
alert('$message');
window.location.href='../html/choicePage.php';
</script>";
$x++;
}
foreach($countryArr as $country) {
echo $country;
}
?>
Please see the comments I added
<?php
$x = 1;
while(!isset($_POST['stopButton'])) { // this runs if no form post stopButton
$countryArr[$x] = $searchCountry; // $searchCountry is undefined
$message = "added!";
echo "<script>
alert('$message');
window.location.href='../html/choicePage.php';
</script>";
$x++;
} // it's still not posted, never will be in this request, so this will keep looping
foreach($countryArr as $country) { // you only an array of empty strings, but won't reach here
echo $country;
}
I have a simple PHP code, as below.
When I try the URL localhost/df.php?result1=bharat, I get the result Bharat, exactly as I want it. But when I try the URL localhost/df.php?result2=bharat, I get an error, meaning my result2 variable was not read like my result1 variable did.
Could you please correct my code so that it works?
<?php
if(isset($_GET['Result1']))
{
$file = $_GET['Result1'];
}
else
{
echo "Error"; exit;
}
echo "$result1";
?>
elseif(isset($_GET['Result2']))
{
$file = $_GET['Result2'];
}
else
{
echo "Error"; exit;
}
echo "$result2";
?>
You have way too many errors in your code. The following is the solution to your problem:
<?php
if(isset($_GET['result1']))
{
$result1 = $_GET['result1'];
echo $result1;
}
elseif(isset($_GET['result2']))
{
$result2 = $_GET['result2'];
echo $result2;
}
else
{
echo "Error";
exit();
}
?>
For the future, I would recommend you to learn PHP and be familiar with the basic syntax, at least, before posting questions about it here.
I'm making a mini shopping cart for my project. Im storing the number of items chosen by the user, I don't understand that when i add one to my session variable I always get this error on the first go
Undefined index: cart_1 in D:\wamp\www\MiniCart\cart.php on line 100
And when I add again or refresh the same page it works fine. Why could this error be coming up? I removed the +=1 from the statement and it worked fine, apparently there is no syntax error too.
Cart.php
<!DOCTYPE>
<html>
<head></head>
<body>
<?php
session_start();
//The page where to jump to after adding/editing cart.
$page = 'mini_cart_index.php';
$link = mysqli_connect("localhost","root","","cart");
if(mysqli_connect_errno())
{
echo "Error:".mysqli_connect_error();
echo "<br/>";
} else {
echo "Connected to SQL<br/>";
}
//==================================================
if(isset($_GET['add']))
{
$obt=$_GET['add'];
$quantity_limit = 'SELECT id,quantity FROM products WHERE id='.mysqli_real_escape_string($link,(int)$_GET['add']);
$quantity = mysqli_query($link,$quantity_limit);
while($quantity_row=mysqli_fetch_assoc($quantity))
{
if($quantity_row['quantity']!=$_SESSION['cart_'.$_GET['add']])
{
$_SESSION['cart_'.$_GET['add']]+='1';
}
}
/*
echo 'id='.$obt.' '.'next<br/>';
echo 'Now storing info into session variable and adding one<br/>';
echo $_SESSION['cart_'.$_GET['add']];
echo '<br/>';
echo 'info stored<br/>';
*/
}
//***************************************************
function products()
{
GLOBAL $link;
$get ="SELECT id,name,description,price FROM products
WHERE quantity > 0 ORDER by id ASC";
if($result=mysqli_query($link,$get))
{
echo "Data Selected to be displayed<br/>";
} else {
echo "Error:".mysqli_error($link);
}
if(mysqli_num_rows($result)==0)
{
echo "There are no products to display!<br/>";
} else {
while($get_row=mysqli_fetch_assoc($result))
{
echo '<hr/><br/>';
echo 'displaying data from database<br/>';
echo '==================================';
echo '<p>'.$get_row['name'].'<br/>'.
$get_row['description'].'<br/>'.
number_format($get_row['price'],2).
' Add'.'</p>';
echo '<hr/><br/>';
}
}
}
echo 'outside'.$_SESSION['cart_1'];
?>
</body>
</html>
Mini_cart_index.php
<?php require 'cart.php';?>
<!DOCTYPE>
<html>
<head>
</head>
<body>
<?php products() ?>
</body>
</html>
That code is filled with SQL injection vulnerabilities, you should use PDO and prepare your statements.
PHP is warning you because it has to read the current value and add to it, but the first time you try to access it doesn't exist.
You could suppress the warning with:
#$_SESSION['cart_'.$_GET['add']]+='1';
A better way to do it though would be checking if it exists first
$name = 'cart_'.$_GET['add'];
if(isset($_SESSION[$name]) {
$_SESSION[$name] = 1;
} else {
$_SESSION[$name] += 1;
}
The problem is caused by the fact that...
$var['abc'] += 1
...is the same as
$var['abc'] = $var['abc'] + 1
So if you've got a clean session and $var['abc'] doesn't exist, you're going to get a warning because you're trying to read a non-existant value in order to add 1 to it.
While it's true that 0 + 1 = 1
...what's actually happening here is undefined + 1 = 1 with a warning.
As other answers have mentioned - to fix the issue, you can explicitly check that the array index exists before trying to increment it.
I'd do that with the ternary operator like this:
$key = 'card_' . $_GET['add'];
$_SESSION[$key] = (isset($_SESSION[$key]) ? $_SESSION[$key] : 0) + 1;
This is effectively saying
$val = ($val if it exists, otherwise 0) + 1;
Change your if statement to check if it's empty too:
if (!isset($_SESSION['cart_'.$_GET['add']])) {
$_SESSION['cart_'.$_GET['add']] = 1;
} elseif ($quantity_row['quantity'] != $_SESSION['cart_'.$_GET['add']]) {
$_SESSION['cart_'.$_GET['add']] += 1;
}
i'm using JSON to get data and then PHP to display. so...
i'm showing everything available to a person and i want to echo a message when the loop is blank/empty that "there's nothing available" because right now it just shows a blank screen when there is no data... any ideas??
<?
foreach($json['available'] as $r) {
echo '<li>' .$r['item'].'</li>';
}}
?>
Just use an if statement and check if $json['available'] is empty with empty().
if( empty( $json['available'])) {
echo '<li>No items are available</li>';
} else {
foreach($json['available'] as $r) {
echo '<li>' .$r['item'].'</li>';
}
}
Use empty to check if $json contains something or not.
Assuming that $json['available'] is going to be an empty array at worst:
if (!$json['available']) {
echo "nothing to show!";
}
else {
// your current code
}
If it's possible that $json['available'] might not even exist, a more "heavy-handed" alternative is
if (empty($json['available'])) {
echo "nothing to show!";
}
for($c=1;$c<=$num;$c++)
{
$row=mysql_fetch_array(mysql_query("SELECT * FROM `$quiztitle` WHERE id=$c"));
if($row['answer']==$_POST['answer'][$c]) // NOT WORKING
{
echo "correct";
echo "<br>";
}
else
{
echo "incorrect";
echo "<br>";
}
}
on the line where it says "NOT WORKING",
the index [$c] does not get the value from the loop.
but when i specify it and change it to $_POST['answer1'], it is working.
what is the correct syntax for this?
Try this.
for($c=1;$c<=$num;$c++)
{
$row=mysql_fetch_array(mysql_query("SELECT * FROM `$quiztitle` WHERE id=$c"));
if($row['answer']==$_POST['answer'.$c]) // NOT WORKING
{
echo "correct";
echo "<br>";
}
else
{
echo "incorrect";
echo "<br>";
}
}
You're treating 'answer' as an array here, looking for an index within.
You want to concatenate the value.
if($row['answer']==$_POST["answer{$c}'])
Based on your note, it looks like you want:
$_POST["answer$c"]
Correct is:
if ($row['answer'] == $_POST['answer' . $c]) {
....
}