validate options[] with isset - php

Question

Hey i am having some trouble getting an options[] array to work, if anyone can help that will be great
Form
<form method="post" action="array2.php">
<select name="options[]">
<option value=""></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
<input name="submit" type="submit" value="submit">
</form>
The array2.php
<?php
session_start();
if(isset($_POST['submit'])){
if($_POST['options[]'] == "" ){
header("Location: error.html");
exit;
}else{
$checked = $_POST['options'];
$_SESSION['checked'] = $checked;
}
}
?>
Any help would be great, also what happens is even if it's an empty feild, the thing progress's to the rest of the script
rest of script
<?php
for($i=0; $i < count($checked); $i++){
echo "You have selected to recive " . $checked[$i] . " tickets<br/>";
}
for($i=0; $i < count($checked2); $i++){
echo "And you have selected to recive " . $checked2[$i] . " for accommodation are you sure? <br/>";
}
?>
Sorry I am unable to reply to people for now soon as I posted it a class came to the empty room so need to wait an hour :/

Answer 1

You need the change your options[] to option as it mean you are submitting multiple select with the same name
<form method="post" action="array2.php">
<select name="options">
<option value=""></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
<input name="submit" type="submit" value="submit">
</form>
in your array2.php file
<?php
session_start();
if(isset($_POST['submit'])){
if($_POST['options'] == "" ){
header("Location: error.html");
exit;
}else{
$checked = $_POST['options'];
$_SESSION['checked'] = $checked;
}
}
?>
if you really need to send options[]
<?php
session_start();
if(isset($_POST['submit'])){
if(is_array($_POST['options']){
if($_POST['options'][0] == "" ){
header("Location: error.html");
exit;
}else{
$checked = $_POST['options'][0];
$_SESSION['checked'] = $checked;
}
}else{
if($_POST['options'] == "" ){
header("Location: error.html");
exit;
}else{
$checked = $_POST['options'];
$_SESSION['checked'] = $checked;
}
}
}
?>
you can clean this if else as you like

Answer 2

You can use this example code
<?php
if($_POST) {
if(isset($_POST['state'])) {
if($_POST['state'] == 'NULL') {
echo '<p>Please select an option from the select box.</p>';
}
else {
echo '<p>You have selected: <strong>', $_POST['state'], '</strong>.</p>';
}
}
}
?>
and your html code
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<fieldset>
<legend>Please select a state</legend>
<select name="state">
<option value="NULL">-- Please select a state --</option>
<option value="AK">AK - Alaska</option>
<option value="AL">AL - Alabama</option>
<option value="WY">WY - Wyoming</option>
</select>
<input type="submit" name="submit">
</fieldset>
</form>

Answer 3

in your case options[] can be used for sending multiple fields as array, the index starts with 0, for example:
<input name="test[]"> : index 0
<input name="test[]"> : index 1
then, you can get these values in $_POST['test'] like this:
$input_one = $_POST['test'][0];
$input_one = $_POST['test'][1];
if you look at this inside $_POST it will be like this:
$_POST = array (
...,
'test' => array(0=> ..., 1 => ...)
)
for your form, if you only had one options[], then the value is the $_POST will be
if(isset($_POST['options'][0])){
}

Answer 4

So let's clean it up
<select name="options">
You do not need options[].
And then the result of $_POST['options'] will be the value of option. And add there <option value="0">Select</option> and then check whether the POSTed data is higher then 0

Answer 5

in html
<select name="options">
<option value="0"></option>
<option value="1">1</option>
.
.
in php
if(isset($_POST['options']) && !empty($_POST['options'])) {
$checked = $_POST['options'];
}