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    <p>I came up with a way to specify alignment on a per-caption basis.</p> <p>Basically, I copied the caption shortcode from the media.php and made it into my own custom function which accepts a "captionalign" argument.</p> <p>To use, paste the below code into your theme's "function.php" file - this will allow you to specify an option in your caption tag named captionalign. By setting this to right, left, or center, you can specify a per-caption text alignment. Leaving out the attribute will have the caption default to whatever you have your default alignment as.</p> <p>An example of this in use:</p> <pre><code>[caption align="aligncenter" width="300" caption="My caption" captionalign="right"] &lt;a href="http://www.myawesomeblog.com/wp-content/uploads/2010/05/image.jpg"&gt; &lt;img title="My image" src="http://www.myawesomeblog.com/wp-content/uploads/2010/05/image.jpg-300x216.jpg" alt="My image" width="300" height="216" /&gt; &lt;/a&gt; [/caption] </code></pre> <p>And here is the function:</p> <pre><code>add_shortcode('wp_caption', 'custom_img_caption_shortcode'); add_shortcode('caption', 'custom_img_caption_shortcode'); /** * The Caption shortcode. * * Allows a plugin to replace the content that would otherwise be returned. The * filter is 'img_caption_shortcode' and passes an empty string, the attr * parameter and the content parameter values. * * The supported attributes for the shortcode are 'id', 'align', 'width', and * 'caption'. * * @since 2.6.0 * * @param array $attr Attributes attributed to the shortcode. * @param string $content Optional. Shortcode content. * @return string */ function custom_img_caption_shortcode($attr, $content = null) { // Allow plugins/themes to override the default caption template. $output = apply_filters('img_caption_shortcode', '', $attr, $content); if ( $output != '' ) return $output; extract(shortcode_atts(array( 'id' =&gt; '', 'align' =&gt; 'alignnone', 'width' =&gt; '', 'caption' =&gt; '', 'captionalign' =&gt; '' ), $attr)); if ( 1 &gt; (int) $width || empty($caption) ) return $content; if ( $id ) $id = 'id="' . esc_attr($id) . '" '; return '&lt;div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . (10 + (int) $width) . 'px"&gt;' . do_shortcode( $content ) . '&lt;p class="wp-caption-text" style="text-align:' . $captionalign . '"&gt;' . $caption . '&lt;/p&gt;&lt;/div&gt;'; } </code></pre> <p>Hope that helps someone!</p>
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    1. POWordpress: How to add a caption right-aligned to the edge of the image
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