Bad example of how things were done. Used in a blog post about using a framework.

bad_example.php

<?php
error_reporting (E_ALL ^ E_NOTICE);
session_start(); 
include "./includes/class.pageClass.php";
require "./includes/class.requiredField.php";
require "./includes/inc.functions.php";
require "./includes/inc.dbConnection.php";

$page = new Page;
$page->Debug();

$page->RequireLogin(); //redirects if your not logged in

Connect();

UpdateWorkersResponse($_GET['id'],$_GET['record'],$_GET['response']);

$page->SetTitle("Administration");
$page->SetScript("
function HideAll(){
if (document.getElementById('adminAll').style.display == 'none')
{
document.getElementById('adminAll').style.display = 'block'
document.getElementById('adminAllToggle').innerHTML = 'Hide'
} else {
document.getElementById('adminAll').style.display = 'none'
document.getElementById('adminAllToggle').innerHTML = 'Show'
}

}
");

if ($_COOKIE['whoAmI'] == "| Logged in as Naomi") {
$content = "
<div id='divGeneralContainer'> <h2 id='mainAdminLinks'><a href='javascript:doClick(1)'>Add Worker</a> | <a href='javascript:doClick(2)'>Remove Worker</a> | <a href='javascript:doClick(3)'>Assign Worker</a> | <a href='javascript:doClick(4)'>Requests</a></h2>
<div id='divAddWorker'>
                <form id='myvalid' action='' method='post' >
            <p>
                        <label for='txtFirstName' class='label-left'>First Name:</label><input class='required' id='txtFirstName' name='fname'  />
            </p>
            <p>
            <label for='txtLastName' class='label-left'>Last Name:</label><input class='required' id='txtLastName' name='lname'  />
            </p>
            <p>
            <label for='txtEmail' class='label-left'>Email:</label><input class='required email' id='txtEmail' name='email'  />
            </p>  
            <p> <label for='leader' class='label-left' >Leader:</label>". AdminSelect("leader", "leader") ."</p>
                                <p>
                                
                                        
                                                <label for='isLeader' class='label-left'>Is Leader:<input type='checkbox' name='isLeader' name='isleader' id='isLeader' value='yes'></label>
                                                <input id='addSubmit' type='submit' value='Add' id='btnSubmit' />
                        </p>
        
                </form>
    </div>
    
    <div id='divRemoveWorker' style='display:none;'>
                
                        <table>
                                <tr>
                                        <td id='tdRemoveWorkers'>" . WorkersSelect("selRemoveWorker", "selRemoveWorker") . "</td>
                                        <td>
                    <span class='messages' id='removeWorkerMessage'>Worker Removed</span>
                    </td>
                                </tr>
                                <tr>
                                        <td align='right'>
                        <input style='display:none;' id='confirmRemove' type='submit' value='Confirm' onClick='RemoveWorker(this);' />
                        <input type='submit' value='Remove' onClick='ConfirmRemoveWorker();' />
                    </td>

                                </tr>
                        </table>
                
    </div>
    
    <div id='divAssignWorkerLeader' style='display:none;'>
                
                        <table>
                                <tr><td>Assign:</td><td>". WorkersSelect("selAssignWorker", "selAssignWorker") ."<span id='assignVerify'>Worker Assigned</span></td></tr>
                                <tr><td>Leader:</td><td>" . AdminSelect("selAsignToAdmin", "selAsignToAdmin") . "</td></tr>
                                <tr><td><input type='submit' value='Assign' onClick='AssignWorker();'></td><td align='right'></td></tr>
                        </table>
                
    </div>
    
        <div id='divPrayerRequests' style='display:none'>
        
            <div class='requests'>
                <div class='requestText'>
                    ". GetPrayerRequests() ."
                    <br />
                    <br />
                    Request: <span id='requestnotify'>Request Updated</span> <br />
                    <textarea id='txtRequest' name='request' rows='5' cols='15' ></textarea>
                    <input type='submit' id='submitRequest' value='Update' onClick='SubmitRequest()'>
                </div>
                <img id='requestImg' class='requestImg' src='' width='150' />
                <input type='hidden' id='nope' />
            </div>
        
        <div style='clear: both'></div>
        </div>
        
</div>
";
} //end of tylers content
$content .="
<script language='JavaScript'>
". 
$sReqiredDeclarations 
."
var btnSubmit = document.getElementById('btnSubmit');
var divErrorMSG = document.getElementById('divErrorMSG');

var divContent = [0,
document.getElementById('divAddWorker'),
document.getElementById('divRemoveWorker'),
document.getElementById('divAssignWorkerLeader'),
document.getElementById('divPrayerRequests')
];

var currentDiv = 1;

".
$sRequiredDef
."

function ControlMayNotBeBlank(_ctl,_msg){
        this.control = _ctl; 
        if ('' == _msg){
                this.message = _ctl.name + ' may not be blank.';
        } else {
                this.message = _msg;
        }
        return this;
}

function doClick(num){
        if(currentDiv != 0)
        {
                divContent[currentDiv].style.display = 'none';
        }
        currentDiv = num;
        divContent[currentDiv].style.display = 'block';
}

ControlMayNotBeBlank.prototype.isValid = function () {
        return this.control.value != '';
}

 function CheckRequiredTextFields(listOfFields, divErrorMessage)
 {
        var k;
        divErrorMessage.innerHTML = '';
        var returnValue = true;
        
        for (k=0;k < listOfFields.length; ++k)
        {
           if(!listOfFields[k].isValid())
           {
             divErrorMessage.innerHTML =  divErrorMessage.innerHTML
                         + '<br />' + listOfFields[k].message;
             returnValue = false;
           }
        }
        
        return returnValue;
 }
 
 function CheckFields() {
        var okToSubmit = true;
        divErrorMSG.innerHTML = ''//reset the error block
        okToSubmit = CheckRequiredTextFields(requiredTextFields, divErrorMSG);
        btnSubmit.disabled = !okToSubmit;
 }

</script>
";

$page->SetContent($content .
"<h2>If you need to change a worker you do it here. <a href='javascript:HideAll()'><span id='adminAllToggle'>Hide</span></a></h2>" . AdminListAll());

$page->RenderPage();

?>