[WP] Parse content for shortcode, extract & show it somewhere else, delete it from content

wp_extract_slider_from_post.php

<?php
	
	/* Example with Visual Composer and an add-on for Slides
	|
	| We want to remove the slider from the post content,
	| while keeping it in the backend post editor VC content, 
	| then place it somewhere else, like the header.
	|
	| In our case, the slider always sits at the top of the
	| post content editor, as first item, in its own row.
	|_____________________________________________________________*/
	
	// in header.php
	
	global $post;
	setup_postdata( $post );
	$fullstring = get_the_content($post->ID);
	$arr = array_map('trim',array_filter(explode('[/vc_row]',$fullstring),'strlen'));
	if(strpos( $arr[0], 's_slider' ) !== false ) {
		echo '<div class="container slider_extracted">';
		echo do_shortcode('[vc_row]'.$arr[0].'[/vc_row]');
		echo '</div>';
	}
	
	// in single.php
	
	$fullstring = get_the_content($post->ID);
	$arr = array_map('trim',array_filter(explode('[/vc_row]',$fullstring),'strlen'));
	if(strpos( $arr[0], 's_slider' ) !== false ) {
		$remove_slider = $arr[0].'[/vc_row]';
		$new_content = str_ireplace($remove_slider, '', $fullstring);
	}
	
	if(strpos( $arr[0], 's_slider' ) !== false ) {
		echo wpautop(do_shortcode($new_content));
	} else {
		the_content();
	}
	
?>