Sample Coding in Magento 1.9. I type a good naming conversion for classes and IDs. I add the comments to the end of every closed tags. Simple and neat formatting for PHP if else conditions / for each loop, etc. I type coding the way for easy reading for designers/developers

SampleCode.php

<?php 
/*
@Orginal Author: Ravi Panghat
@Orginal Update Date: 12/01/2014
@Orginal Description: Setup the Product Page, layout, Product Image, Tabs
@Last Author: Ravi Panghat
@Last Update Date: 20/03/2016
@Last Update Description: The client Richard requests to add the product's brand logo image. Implemented the brand logos. 
*/ ?>

<?php $_helper = $this->helper('catalog/output'); ?>
<?php $_product = $this->getProduct(); ?>
<script type="text/javascript">
    var optionsPrice = new Product.OptionsPrice(<?php echo $this->getJsonConfig() ?>);
</script>

<div id="messages_product_view"><?php echo $this->getMessagesBlock()->toHtml() ?></div><!-- /.messages_product_view-->

<div class="product-view" itemscope itemtype="http://schema.org/Product">

    <div class="product-essential clearfix">
            <div class="row">

            <form action="<?php echo $this->getSubmitUrl($_product, array('_secure' => $this->_isSecure())) ?>" method="post" id="product_addtocart_form"<?php if($_product->getOptions()): ?> enctype="multipart/form-data"<?php endif; ?>>
                <?php echo $this->getBlockHtml('formkey') ?>
                
                <input type="hidden" name="product" value="<?php echo $_product->getId() ?>" />
                <input type="hidden" name="related_product" id="related-products-field" value="" />

                <div class="product-img-box column-xs-12 column-sm-6 column-md-8">
                    <div class="product-name">
                        <h1><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></h1>
                    </div><!-- /.product-name-->
                    <?php echo $this->getChildHtml('media') ?>
                </div><!-- /.product-img-box-->
                
                <div class="column-xs-12 column-sm-6 column-md-4">
                <?php 
                    $brandImage = Mage::helper('bubble_aop')->getAttributeOptionAdditionalImage($_product->getOwBrand());
                    $images = Mage::helper('bubble_aop')->getAttributeOptionAdditional2Images();
                    $imageOrLink = array_key_exists($_product->getOwBrand(), $images) ? $images[$_product->getOwBrand()] : '';
                ?>
                        <?php if ( $_product->getOwBrand() && $brandImage )) : ?>
                        <div class="product-brand clearfix">
                            <?php if (!is_array(getimagesize($imageOrLink))): ?>
                                <a href="<?php echo Mage::getUrl($imageOrLink) ?>">
                            <?php endif ?>
                                <img class="img-responsive" src="<?php echo $brandImage ?>">
                            <?php if (!is_array(getimagesize($imageOrLink))): ?>
                                </a>
                            <?php endif ?>
                        </div><!-- /.product-brand -->
                    <?php endif; ?>
                    <div class="product-shop clearfix">
                        
                        <div class="product-name mobile-hidden clearfix">
                            <span class="h1" itemprop="name"><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></span>
                        </div><!-- /.product-name -->

                        <meta itemprop="url" content="<?php echo $_product->getUrlModel()->getUrl($_product, array('_ignore_category'=>true)); ?>" />
                        <meta itemprop="image" content="<?php echo $_product->getImageUrl(); ?>" />
                        <meta itemprop="sku" content="<?php echo $this->htmlEscape($_product->getSku()); ?>"/>
                        <meta itemprop="description" content="<?php echo strip_tags($_product->getDescription()); ?>" />
                        <link itemprop="itemCondition" href="http://schema.org/NewCondition"/>

                        <div class="price-info clearfix">
                            <?php echo $this->getPriceHtml($_product); ?>
                            <?php echo $this->getChildHtml('bundle_prices') ?>
                            <?php echo $this->getTierPriceHtml() ?>
                        </div><!-- /.price-info -->

                        <div class="extra-info clearfix">
                            <?php echo $this->getReviewsSummaryHtml($_product, 'default', false)?>
                            <?php echo $this->getChildHtml('product_type_availability'); ?>
                        </div><!-- /.extra-info -->

                        <div class="product-info-links clearfix">
                            <a class="anchor-link" href="#product-description"><?php echo  $this->__('Description'); ?></a>
                            <a class="anchor-link" href="#product-frame-details"><?php echo  $this->__('Frame Details'); ?></a>
                            <a class="anchor-link" href="#product-delivery-returns"><?php echo  $this->__('Delivery & Returns'); ?></a>
                        </div><!-- /.product-info-links -->

                        <?php echo $this->getChildHtml('alert_urls') ?>
                        <?php echo $this->getChildHtml('other');?>

                        <?php if ($_product->isSaleable() && $this->hasOptions()):?>
                            <?php echo $this->getChildChildHtml('container1', '', true, true) ?>
                        <?php endif;?>

                        <div class="add-to-cart-wrapper clearfix">
                            <?php echo $this->getChildHtml('product_type_data') ?>
                            <?php echo $this->getChildHtml('extrahint') ?>

                            <?php if (!$this->hasOptions()): ?>
                                <div class="product-has-no-options add-to-box">
                                    <?php if($_product->isSaleable()): ?>
                                        <?php echo $this->getChildHtml('addtocart') ?>
                                        <?php if( $this->helper('wishlist')->isAllow() || $_compareUrl=$this->helper('catalog/product_compare')->getAddUrl($_product)): ?>
                                            <span class="or"><?php echo $this->__('OR') ?></span>
                                        <?php endif; ?>
                                    <?php endif; ?>
                                    <?php echo $this->getChildHtml('addto'); ?>
                                </div><!-- /.product-info-links -->
                                <?php echo $this->getChildHtml('extra_buttons'); ?>
                            <?php elseif (!$_product->isSaleable()): ?>
                                <div class="product-has-no-stock add-to-box">
                                    <?php echo $this->getChildHtml('addto'); ?>
                                    <?php //echo $this->getChildHtml('sharing') ?>
                                </div><!-- /.product-has-no-stock -->
                            <?php endif; ?>
                        </div><!-- /.add-to-cart-wrapper -->

                        <div class="product-has-options clearfix">
                            <?php if ($_product->isSaleable() && $this->hasOptions()):?>
                                <?php echo $this->getChildChildHtml('container2', '', true, true) ?>
                            <?php endif;?>
                        </div><!-- /.product-has-options -->
                    </div><!-- /.product-shop -->
               
                </div><!-- /.column-xs-12 -->

            </form>
        </div><!-- /.row -->
    </div><!-- /.product-essential -->

    <script type="text/javascript">
    //<![CDATA[
        var productAddToCartForm = new VarienForm('product_addtocart_form');
        productAddToCartForm.submit = function(button, url) {
            if (this.validator.validate()) {
                var form = this.form;
                var oldUrl = form.action;

                if (url) {
                   form.action = url;
                }
                var e = null;
                try {
                    this.form.submit();
                } catch (e) {
                }
                this.form.action = oldUrl;
                if (e) {
                    throw e;
                }

                if (button && button != 'undefined') {
                    button.disabled = true;
                }
            }
        }.bind(productAddToCartForm);

        productAddToCartForm.submitLight = function(button, url){
            if(this.validator) {
                var nv = Validation.methods;
                delete Validation.methods['required-entry'];
                delete Validation.methods['validate-one-required'];
                delete Validation.methods['validate-one-required-by-name'];
                // Remove custom datetime validators
                for (var methodName in Validation.methods) {
                    if (methodName.match(/^validate-datetime-.*/i)) {
                        delete Validation.methods[methodName];
                    }
                }

                if (this.validator.validate()) {
                    if (url) {
                        this.form.action = url;
                    }
                    this.form.submit();
                }
                Object.extend(Validation.methods, nv);
            }
        }.bind(productAddToCartForm);
    //]]>
    </script>
    
    <?php echo $this->getChildHtml('related_products'); ?>
    
    <?php $delivery_information = $this->getLayout()->createBlock('cms/block')->setBlockId('product_delivery_information')->toHtml(); ?>
    <?php $additional_attributes = $this->getChildHtml('additional') ?>
    
    <div class="product-info-box clearfix">
        <div class="row">
            <div class="column-xs-12 column-sm-8 column-md-8">
                
                <div class="product-description-box" id="product-description">
                    <h2 class="product-info-title">
                        <?php echo $this->__('Description'); ?>    
                    </h2>
                    <div class="product-info-content">
                        <?php if ($_product->getShortDescription()):?>
                            <div class="short-description">
                                <div class="std"><?php echo $_helper->productAttribute($_product, nl2br($_product->getShortDescription()), 'short_description') ?></div>
                            </div><!-- /.short-description -->
                        <?php endif;?>
                        <?php echo $_product->getDescription; ?>            
                    </div><!-- /.product-info-content -->
                </div><!-- /.product-description -->        

                <?php if ($delivery_information): ?>
                    <div class="product-delivery-info-box" id="product-delivery-returns">
                        <h2 class="product-info-title product-delivery-info-title">
                            <?php echo $this->__('Delivery & Returns'); ?>
                        </h2>
                        <div class="product-info-content product-delivery-content">
                            <?php echo $delivery_information; ?>
                        </div><!-- /.product-info-content -->
                    </div><!-- /.product-delivery-info-box -->
                <?php endif; ?>
            
                <?php echo $additional_attributes; ?>

            </div><!-- /.column-xs-12 -->
        </div><!-- /.row -->
    </div><!-- /.product-info-box -->
</div><!-- /.product-view -->

<?php echo $this->getChildHtml('upsell_products'); ?><?php echo $this->getChildHtml('product_additional_data') ?>

<?php /* TODO - Ravi Panghat
    <div class="product-collateral">
        <?php if ($detailedInfoGroup = $this->getChildGroup('detailed_info', 'getChildHtml')):?>
            <div class="collateral-tabs">
                <?php foreach ($detailedInfoGroup as $alias => $html):?>

                    <div class="tab"><span><?php echo $this->escapeHtml($this->getChildData($alias, 'title')) ?></span></div>
                    <div class="tab-container">
                        <div class="tab-content"><?php echo $html ?></div>
                    </div>
                <?php endforeach;?>
            </div>
        <?php endif; ?>
    </div>
*/ ?>