This question already has an answer here:
when I visit mainpage.php without going to settings, my page gives me the undefined variable error for all the variables, but when I input something in the settings and submit, it doesnt show anymore. Anyways, here's the code so far.
Mainpage.php
<html>
<head><title></title></head>
<body>
<a href="logout.php">Logout</a>
<a href="settings.php">Settings</a>
</form>
</body>
</html>
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$bio = $_POST['bio'];
$hobbies = $_POST['hobbies'];
$past = $_POST['past'];
$work = $_POST['work'];
echo $bio;
echo $email;
echo $name;
echo $hobbies;
echo $past;
echo $work;
?>
settings.php
<html>
<head><title></title></head>
<body>
<a href="logout.php">Logout</a>
<a href="mainpage.php">Main Page</a>
<form action="mainpage.php" method="post">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
Bio: <input type="text" name="bio"><br>
Hobbies: <input type="text" name="hobbies"><br>
Past School: <input type="text" name="past"><br>
Work History: <input type="text" name="work"><br>
<input type="submit">
</form>
<form action="upload_file.php" method="post"
enctype="multipart/form-data">
<label for="file">Choose Profile Picture:</label>
<input type="file" name="file" id="file">
<input type="submit" name="pic" value="Submit">
</form>
</body>
</html>
I can't seem to find out how to get rid of the undefined error. Someone suggested isset I believe.
</div>
Use check for empty $_POST
if (!empty($_POST)){
$name = $_POST['name'];
$email = $_POST['email'];
/* ... */
}
your $_POST is empty
mainpage.php - the file upload and the input fields belonged to two different forms and there were two submit buttons. the information would never be sent at the same time. I combined the forms into one form with just one submit button.
<html>
<head><title></title></head>
<body>
<a href="logout.php">Logout</a>
<a href="mainpage.php">Main Page</a>
<form action="upload_file.php" method="post" enctype="multipart/form-data">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
Bio: <input type="text" name="bio"><br>
Hobbies: <input type="text" name="hobbies"><br>
Past School: <input type="text" name="past"><br>
Work History: <input type="text" name="work"><br>
<!--input type="submit"-->
<!--/form-->
<!--form action="upload_file.php" method="post" enctype="multipart/form-data"-->
<label for="file">Choose Profile Picture:</label>
<input type="file" name="file" id="file">
<br/>
<input type="submit" name="pic" value="Submit">
</form>
</body>
</html>
upload_file.php - the file info and the input info belong to two different arrays.
<?php
// the reason we should check for each $_POST variable and not just
// if (!empty($_POST)) { ... }
// is because you will still get errors if one of those keys do not
// exist inside of $_POST... if you do $file = $_FILE['file'] there
// will be an error. however, $_POST is always going to exist, so
// we don't need to check it. the keys may or may not exist, though
$name = isset($_POST['name']) ? $_POST['name'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';
$bio = isset($_POST['bio']) ? $_POST['bio'] : '';
$hobbies = isset($_POST['hobbies']) ? $_POST['hobbies'] : '';
$past = isset($_POST['past']) ? $_POST['past'] : '';
$work = isset($_POST['work']) ? $_POST['work'] : '';
echo "bio: $bio<br/>";
echo "email: $email<br/>";
echo "name: $name<br/>";
echo "hobbies: $hobbies<br/>";
echo "past: $bio<br/>";
echo "work: $work<br/>";
print "<pre>";
if (isset($_POST))
{
print "this is the \$_POST information:
";
print_r($_POST);
}
else { print "no post information sent."; }
print "
";
if (isset($_FILES))
{
print "this is the \$_FILE information:
";
print_r($_FILES);
}
else { print "no file information sent."; }
print "</pre>";
?>
So... just a disclaimer, beware of SQL injection when working with $_POST values.
output will look like this... (so you can see the structure of $_POST $_FILE)
bio: three
email: two
name: one
hobbies: four
past: three
work:
this is the $_POST information:
Array
(
[name] => one
[email] => two
[bio] => three
[hobbies] => four
[past] =>
[work] =>
[pic] => Submit
)
this is the $_FILE information:
Array
(
[file] => Array
(
[name] => Capture.PNG
[type] => image/png
[tmp_name] => C:\wamp\tmp\php1D7E.tmp
[error] => 0
[size] => 12968
)
)
(also, note, I keep updating for future users who come across this question)