Capture post view by capturing IP address using WordPress Function and ACF field [meta field]. Help full for creating any section for Popular Posts.

functions.php

//Create 2 custom meta field with the names: 'wpb_post_views_count' and 'user_ip'.
<?php
function wpb_set_post_views($postID) {
	$user_ip = $_SERVER['REMOTE_ADDR']; //retrieve the current IP address of the visitor
    $key = $user_ip . 'x' . $postID; //combine post ID & IP to form unique key
    $value = array($user_ip, $postID); // store post ID & IP as separate values (see note)
    $visited = get_transient($key); //get transient and store in variable

    //check to see if the Post ID/IP ($key) address is currently stored as a transient
    if ( false === ( $visited ) ) {
		$count_key = 'wpb_post_views_count';
		$ipField = 'user_ip';
		$count = get_post_meta($postID, $count_key, true);
		
		if ( get_post_meta( $postID, $user_ip, true ) != '' ) {
        	$ip = json_decode( get_post_meta( $postID, $user_ip, true ), true );
		} else {
			$ip = array(); 
		}

		for ( $i = 0; $i < count( $ip ); $i++ ) {
			if ( $ip[$i] == $user_ip )
				return false;
		}

		$ip[ count( $ip ) ] = $user_ip;
		$json_ip = json_encode( $ip );
		
		if($count==''){
			$count = 1;
			delete_post_meta($postID, $count_key);
			add_post_meta($postID, $count_key, '1');
		}else{
			$count++;
			update_post_meta($postID, $count_key, $count);
			//delete_post_meta($postID, $ipField);
			$olddata = get_field( 'user_ip' );
			$newdata = $json_ip;
			$margedData = $olddata . ',' . $newdata ;
			//update_post_meta($postID, $ipField, $margedData);
			update_post_meta($postID, $ipField, $newdata);
			
			if($olddata == '') {
				update_post_meta($postID, $ipField, $newdata);
			}
			else {
				$count++;
				$newstr = implode(',',array_unique(explode(',', $margedData)));
				delete_post_meta($postID, $ipField);
				add_post_meta($postID, $ipField, $newstr);
				
				$revisedIPs = get_field( 'user_ip' );
				$counter = explode(",",$revisedIPs);
				$views = count(explode(",",$revisedIPs));
				delete_post_meta($postID, $count_key);
				add_post_meta($postID, $count_key, $views);
			}
      //Above condition will check if any IP are accessing the any post multiple times, so will capture the IP for one time only.
		}
	}
}
//To keep the count accurate, lets get rid of prefetching
remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);

function for_single_post() {
	if ( is_single() && 'post' == get_post_type() ) {
		wpb_set_post_views(get_the_ID());
	}
}
add_action( 'wp_footer', 'for_single_post' );

?>