WordPress | Check if parent page has child page of certain slug

check-if-child-pages-of-parent-has-certain-slug.php

<?php

function fs_sc_location_seo_iconbox( $atts ){ 
	// begin output buffering
	ob_start();
  
	global $post; // if outside the loop
  
  	$slug_to_check = 'seo';
  
	// get any child pages of this parent page
  	$child_pages = get_pages( array( 'child_of' => $post->ID ) );
  
	// go through each child page we found
	foreach( $child_pages as $child_page ) {		

		// get the slug of this child page we found
		$child_slug = $child_page->post_name;
	  
		// get the link of this child page we found
		$child_link = get_page_link( $child_page->ID );
	  
		// if the child page we found has the slug we want
	  	if($child_slug === $slug_to_check) {
		  
		  	// output the child page link
			echo '<a href="' . $child_link . '">Our SEO child page</a>';
		
		}  
	}	
  
	// end output buffering, grab the buffer contents, and empty the buffer
	return ob_get_clean();
}
add_shortcode( 'fs_location_seo_iconbox', 'fs_sc_location_seo_iconbox' );