is_plugin_active() not properly returning true

Per the WP Codex, you need to be sure you are passing the directory and file:

<?php
   If (is_plugin_active('plugin-directory/plugin-file.php')) {
     //plugin is activated
  }
?>

Related Posts:

  1. Import WordPress XML File from Within Functions.php
  2. How to manually activate user in dashboard only by admin
  3. What is the correct way of updating wordpress options
  4. register_activation_hook for multiple functions
  5. Adding a second email address to a completed order in WooCommerce [closed]
  6. Possible to search by author name with default WordPress search function?
  7. Advantages and disadvantages of using automatic-feed-links
  8. Breadcrumbs showing Parent and Child Pages
  9. Influence of WordPress functions on site speed
  10. Is it possible to override this function/class in a child theme?
  11. When new user register then add new user role
  12. Change meta tags programatically
  13. Convert hyphen to underscore in permalinks
  14. Remove bulk actions based on user role or capabilities
  15. Set first oembed in post to a global variable or function
  16. Adding extra SVGs to TwentyNineteen child theme using class TwentyNineteen_SVG_Icons
  17. Use a function to update post meta based on other post meta
  18. wp_delete_attachment
  19. Adding body class when post contains a specific shortcode
  20. Displaying Widgets
  21. WordPress registration and contact form 7 [closed]
  22. Display WooCommerce subscriptions for user [closed]
  23. How to preserve edits to Name or Slug of term when using wp_update_term on save?
  24. Woocommerce checkout field maxlength, make input number field only (postcode)
  25. My simple custom shortcode is not longer working (possibly due to upgrade to WordPress 4.4 ?)
  26. PHP files included in functions.php don’t seem to work
  27. how to add an image to the footer?
  28. How to properly add function called by action-hooked function to functions.php?
  29. Get Current User info using wp_localize_script, in functions.php
  30. How to add new embed handler not supported by oembed?
  31. How do I permanently Disable Attachment Post URL
  32. Need to add class=”lightbox” for every single post image
  33. Child Theme files – what is needed?
  34. How do I add Bootstrap and LESS to my migrated WordPress site?
  35. Stuck on maintenance mode
  36. Publish/Update post is changing image links from file url to post url
  37. How to display custom option field in woocommerce orders in admin panel?
  38. Best practices regarding the creation of custom widgets?
  39. Multiple Loops Meta Data
  40. Update user meta of author when post content is viewed
  41. Don’t display html if function returns nothing
  42. If ACF field is empty show different value [closed]
  43. What is the text that appears beside the page titles in the list of pages in the WP admin?
  44. How i can put $_GET codes in function.php?
  45. Is there a way to direct unregistered user to registration page when click a link?
  46. Auto log in hook is requiring a page refresh
  47. How to stop media_sideload_image from running when deleting a post?
  48. I want to display latest post in marquee [closed]
  49. Add php code to wp_print_scripts?
  50. How to get an attachment id from a filename
  51. how to get the post ID from wp_insert_post
  52. Remove ‘page-numbers’ class from prev and next tags
  53. Possible to merge these two functions?
  54. How can I set the SRC URL of the custom logo image?
  55. The Capability to choose post/page template
  56. The_content and Preg_replace in loaded Iframe [closed]
  57. dynamic site link for future migration in echo do_shortcode()
  58. How to make custom comment fields required
  59. Include Jquery libraries in wordpress theme?
  60. WooCommerce -> wc_enqueue_js not working [closed]
  61. Use existing image sizes for WooCommerce
  62. Add a mature content warning to first-time visitors
  63. Retrieve First Image Function
  64. User meta and public function security
  65. Show Featured Image in else statement
  66. Any adverse effects of adding apply_filters to a function?
  67. How can I remove page titles without removing the link in the navigation bar in twentyeleven?
  68. Simplest Way to Build Custom Archives Page?
  69. Filter for replacing the WP_query object for a given category
  70. Custom user role still showing up after deletion, ideas?
  71. How to get taxonomy tree ids without running expensive loops
  72. wordpress built-in Jalali date convertor
  73. Change WooCommerce Payment Options From Radio Buttons to Dropdown Menu
  74. WordPress Function Assistance with Loop
  75. Populate acf-field, depending on block name
  76. Add Change role button for list of user in an event
  77. Set URL Parameter Post Layout As Default
  78. Exclude admins from query get posts
  79. I am trying to set post terms to a custom taxonomy
  80. Classic TinyMCE messing up only Contributor’s HTML
  81. Reference multiple style sheets, clearing styles for permalink page, custom fields for css
  82. How to add publish/draft button in Admin Post Lists
  83. Add schema to Search result page’s body. Tried using is_search
  84. Show users last read posts for each user?
  85. Woocommerce – change order status from on-hold to pending payment
  86. Disable links to images only if link is an image
  87. Sending Messages Back to the Template After Processing?
  88. Shortcode to eliminate and replace with
  89. WordPress Javascript Widget jQuery Dependency Issue
  90. Allow tags and attributes in post and pages content
  91. using enqueue_script in a shortcode isn’t working
  92. Syntax for a function in order to get post’s title in JSON encoded response [closed]
  93. Comment Function
  94. Filter to strip unnecessary attributes
  95. Will my WordPress site become vulnerable after adding this functions which allows more HTML tags for subscribers?
  96. Add product to cart from functions.php
  97. get_post_class() not working well
  98. Get all users from role and add to dropdown (select) – wordpress, javascript
  99. Add functionality to block comment authors in the Comment edit pag
  100. WordPress enque the same script causes the setInterval not to work