I am trying to developing a WordPress theme. I am using a function that is declared in a WordPress plugin. I declared another function in my theme and I want to my theme function when the plugin is not active. So I write the following code:
<?php
if (function_exists(shaplatools_post_thumbnail_gallery())) {
shaplatools_post_thumbnail_gallery();
} else {
boishakhimela_post_thumbnail();
}
?>
But when the plugin is not activated it is showing the following error:
Fatal error: Call to undefined function shaplatools_post_thumbnail_gallery() in /var/www/wordpress/wp-content/themes/boishakhimela/content-page.php on line 11
the content of shaplatools_post_thumbnail_gallery() is as following:
function shaplatools_post_thumbnail_gallery() {
if ( post_password_required() || is_attachment() || ! has_post_thumbnail() ) {
return;
}
if ( is_singular() ) :
$image_gallery = get_post_meta( get_the_ID(), '_shaplatools_image_gallery', true );
if( ! empty( $image_gallery ) ) :
?>
<div class="post-thumbnail">
<?php
if( function_exists( 'shaplatools_image_gallery' ) ) {
echo shaplatools_image_gallery();
}
?>
</div>
<?php
else :
?>
<div class="post-thumbnail">
<?php
if ( has_post_thumbnail() ) {
the_post_thumbnail();
}
?>
</div><!-- .post-thumbnail -->
<?php
endif;
?>
<?php else : ?>
<a class="post-thumbnail" href="<?php the_permalink(); ?>" aria-hidden="true">
<?php
the_post_thumbnail( 'post-thumbnail', array( 'alt' => get_the_title() ) );
?>
</a>
<?php endif; // End is_singular()
}
So how can I fix this problem?
You should use:
function_exists("shaplatools_post_thumbnail_gallery")You need to pass the function name as a string, see http://php.net/function_exists which states
If you’d use
function_exists(shaplatools_post_thumbnail_gallery())then you are actually calling the functionshaplatools_post_thumbnail_gallery()and using it’s return value as argument offunction_exists()