No worries! You may do either a theme or plugin, depending on how you are adding this functionality. Let’s assume you are modifying a theme, in which case you could add the following to functions.php:
if( function_exists('acf_add_options_page') ) {
$option_page = acf_add_options_page(array(
'page_title' => 'Theme General Settings',
'menu_title' => 'Theme Settings',
'menu_slug' => 'theme-general-settings',
'capability' => 'manage_options',
'redirect' => false
));
}
Then you can setup a new field group in ACF, and select as a Rule to display the field group: Options Page is equal to <Your Options Page Name>.
In this field group you would add another image field, for the default image.
Finally, you may modify your code above as follows:
<?php
// First try the image you want
$image = get_field('photo102');
if( empty($image) ):
// If that doesn't work, try to get the Option Page setting
$image = get_field('photo_alternate', 'option');
endif;
// Now check for existence of either option having worked
if( !empty($image) ):
// vars
$url = $image['url'];
$title = $image['title'];
$alt = $image['alt'];
$caption = $image['caption'];
// thumbnail
$size = 'member-listing';
$thumb = $image['sizes'][ $size ];
$width = $image['sizes'][ $size . '-width' ];
$height = $image['sizes'][ $size . '-height' ];
if( $caption ): ?>
<div class="wp-caption">
<?php endif; ?>
<!-- see single-cdtxprofessional.php in this area for code for adding link to picture itself if you want that -->
<img src="<?php echo $thumb; ?>" alt="<?php echo $alt; ?>" width="<?php echo $width; ?>" height="<?php echo $height; ?>" />
</a>
<?php if( $caption ): ?>
<p class="wp-caption-text"><?php echo $caption; ?></p>
</div>
<?php endif; ?>
<?php endif; ?>
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