Help a newbie to understand the logic behind this

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clark_nt

help a newbie to understand the logic behind this

Posted: March 6th, 2009, 8:41 pm

Posts: 27

Hi, i have this script i found on some site:

<?php
if (is_array($_POST['options'])) { 
foreach ($_POST['options'] as $option) { 
echo $option.'<br />'; 
} }?>

<form action="evaluate.php" method="post" name="form">
<select  multiple name="options[]" size="5">
<option value="Cereal">Cereal
<option value="Juice">Juice
<option value="Bread">Bread
</select> 
<input type="submit">
</form>

It works well and i've seen something very similar used to evaluate checkboxes, but how? whats the logic behind that? I think is better if you teach me how to fish instead of only give me the fish, thanks

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bob

Re: help a newbie to understand the logic

Posted: March 6th, 2009, 9:03 pm

Posts: 61

clark_nt wrote:

<html><!--the form is going to be sent via POST to evaluate.php-->
<form action="evaluate.php" method="post" name="form">
<!--user can select more than one option and up to 5 items are going to be shown at a time-->
<!--each SELECTED option will be stored on an array called 'options' inside the $_POST array-->
<select  multiple name="options[]" size="5">
<!--each option value will be stored on the array 'options' ONLY if its selected-->
<!--these are called successful controls-->
<option value="Cereal">Cereal
<option value="Juice">Juice
<option value="Bread">Bread
</select> 
<input type="submit">
</form></html>

<?php
//this line is to make sure that the array 'options' exist on the array '$_POST'
//this is used to avoid errors
if (is_array($_POST['options'])) {
//now this loop is going to send -one at a time- the values of the array 'options' to a variable called $option
//note that the $option value will change each cycle
foreach ($_POST['options'] as $option) { 
echo $option.'<br />'; 
} }?>

was that your question? cheers

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