前端开发人员试图理解Wordpress / PHP代码中的奇怪语法

Question

I'm a front end designer starting to dabble in backend stuff.

I am starting to create a wordpress site for a side business of mine and am using a couple of different plugins. In order for me to successfully use this plugin, I have to edit one of the plugins template files. When I use a certain option in the plugin (Pulling a image down from amazon, tumblr, ebay, instagram, etc...), it pulls down the correct image but inserts a hard coded width and height in the html.

This is great for rendering of the page quick, but I want to change the width and height of the image in the html.

Here's the kicker. In the php, there is a template file in the plugin where i see it pulls this from. It's 50% regular html code and 50% php in the template file.

(So in the plugin settings, if you choose this option, it pulls from that image template.)

In the template, there is a section for the image tag. Which places the <img xxxxxx src=xxxx width=xxxxx height=xxxxx alt=xxxxxx> code into the html.

Here is how the code reads.

    <?php
/*
 * Template:    Image and Prices
 * Stylesheets: basic.css, image.css
 * Scripts:     popover.js
 */
?>

<?php
$price_l = isset($item['attributes']['ListPrice']) ? $item['attributes']['ListPrice'] : false;
$price_c = isset($item['offer']) && isset($item['offer']['price']) ? $item['offer']['price'] : false;
$price_l_numeric = floatval(preg_replace('#[^\d.]#', '', $price_l));
$price_c_numeric = floatval(preg_replace('#[^\d.]#', '', $price_c));
?>

<div class="easyazon-block-information">
    <?php if($image_atts) { ?>
    <div class="easyazon-block-image-container">
        <?php printf('<a %s><img %s /></a>', easyazon_collapse_attributes($link_atts), easyazon_collapse_attributes($image_atts)); ?>
    </div>
    <?php } ?>

    <div class="easyazon-block-information-title"><?php printf('<a %s>%s</a>', easyazon_collapse_attributes($link_atts), esc_html($item['title'])); ?></div>

    <div class="easyazon-block-information-prices">
        <?php if($price_l && (false === $price_c || $price_l_numeric >= $price_c_numeric)) { ?>
        <div class="easyazon-block-information-price"><?php printf('<td class="easyazon-block-information-price-label">%s:</td> <td class="easyazon-block-information-price-value"><a %s>%s</a></td>', __('List Price'), easyazon_collapse_attributes($link_atts), esc_html($price_l)); ?></div>
        <?php } ?>

        <?php if($price_c && 'N/A' !== $price_c) { ?>
        <div class="easyazon-block-information-price"><?php printf('<td class="easyazon-block-information-price-label">%s:</td> <td class="easyazon-block-information-price-value"><a %s>%s</a></td>', __('Price'), easyazon_collapse_attributes($link_atts), esc_html($price_c)); ?></div>
        <?php } ?>

        <?php if($item['offer'] && $item['offer']['saved'] && 'N/A' !== $item['offer']['saved']) { ?>
        <div class="easyazon-block-information-price"><?php printf('<td class="easyazon-block-information-price-label">%s:</td> <td class="easyazon-block-information-price-value"><a %s>%s</a></td>', __('You Save'), easyazon_collapse_attributes($link_atts), esc_html($item['offer']['saved'])); ?></div>
        <?php } ?>
    </div>

    <?php if($cta_atts) { ?>
    <div class="easyazon-block-information-cta">
        <?php $cta_atts['class'][] = 'easyazon-block-cta'; ?>
        <?php printf('<a %s><img %s /></a>', easyazon_collapse_attributes($link_atts), easyazon_collapse_attributes($cta_atts)); ?>
    </div>
    <?php } ?>

    <div class="easyazon-block-information-price-disclaimer">
        <small class="easyazon-price-disclaimer" data-content="<?php printf(__('Prices are accurate as of %1$s. Product prices and availability are subject to change. Any price and availablility information displayed on Amazon at the time of purchase will apply to the purchase of any products.'), date('F j, Y \a\t g:i A', $item['fetched'] + get_option('gmt_offset') * HOUR_IN_SECONDS)); ?>"><?php _e('Price Disclaimer'); ?></small>
    </div>
</div>

What does the s% mean? How does this code pull in all this information for the image. Is it located somewhere else in the plugin? There's lots of other folder. I couldn't personally find it, maybe I didn't look hard enough?

Answer 1

The %s is a type specifier which means it will treat it as a string. It uses the format argument with these specifies that act as slots that the following arguments will be slotted into.

$format = 'some digit %d and some string %s'; echo sprintf($format, $digit, $string);