How to access OOP plugin function inside themes or other plugin

No. You always have to refer to the instance of the class.

Related Posts:

  1. Where do I put the code snippets I found here or somewhere else on the web?
  2. Namespaces in WordPress – How do I initiate the main class?
  3. Customizing subject in comment notification e-mails
  4. Common functionality between my own plugins
  5. How to Loop Plugin Option Field Set?
  6. How to handel multiple checkbox field in the admin settings page with Settings API
  7. wp_insert_user – how to send verification email before logging in
  8. Editor access to plugin settings
  9. Saving Plugin settings to the database
  10. Shortcode display outside the div
  11. Execute a function using ajax
  12. Use functionality of 2 wordpress plugins
  13. What is the function to get plugin base url in multisite?
  14. Fatal error: Class not found in
  15. Extend Elementor Archive Posts widget with a custom skin in order to show multiple badges
  16. HELP: Integrating WP with raw PHP code once published button is hit
  17. How to include and use custom class files in plugin?
  18. Override the core function locate_template
  19. Can wp_script_is used in pluginA check if a script is being enqueued/registered from pluginB?
  20. Current user in plugin returns NULL
  21. Scope for PHP Variables Assigned in functions.php or a plugin
  22. The Point of Using apply_filters()
  23. How to get variables from fucntion.php to my plugin files
  24. How to include code into functions.php file via a plugin
  25. WordPress Plugin Page is Loading in Admin Content Container Instead of Separate Page
  26. plugin development: problem with functions
  27. wordpress plugin is not activating from widget
  28. Edit Yoast SEO breadcrumbs output [closed]
  29. Display post lists in 2nd paragraph
  30. Using a post-signup hook to get user details
  31. creating html reusable blocks via shortcodes
  32. Conditional attributes and logic per product category
  33. WordPress get_avatar function not correct working
  34. Which file of wordpress manage plugins functionalities?
  35. List the authors that have written posts in a category
  36. Check if variable is set in filter
  37. Why is my custom post type not being activated on plug-in activation?
  38. execute function after one completed
  39. WordPress checkbox and Illegal string offset
  40. plugins_url() works everywhere but wp_reqister_script()
  41. Shortcode Attributes to Return different $_POST
  42. Plugin onclick button activate other plugin
  43. get_option / wp_localize_script Not Working in OOP Plug In
  44. Built a second plugin but it overwrote the first one
  45. WordPress Object Oriented plugin development [closed]
  46. My widget won’t update its values when save is clicked
  47. Different registration form for different roles
  48. How can i list random author?
  49. More gentle way to hook WordPress custom url
  50. auto activate plugin when theme is active
  51. How to upload large media file in chunks, without any plugin?
  52. WordPress Custom Hook with Class method
  53. Error using wordpress functions inside a plugin class
  54. Allow a particular user to access a particular plugin?
  55. How to copy the all WordPress media items to another custom plugin folder?
  56. Cookie value changes back to previous value after changing
  57. FPDF for creating pdf diplomas
  58. Is there any way to sync Facebook Comments and with comments on WordPress website?
  59. Fatal error “Call to undefined function is_plugin_active” each time the plugin is activated
  60. Custom Plugin: How to Include Install Buttons of other 3rd Party Plugins?
  61. The function called on the wp head hook becomes null
  62. adding dynamic/multiple slug values in ‘option_none_value’
  63. working code, not working – Plugin Dev
  64. how override a define
  65. WordPress plugin blog creation
  66. Get post content inside plugin class method
  67. register_activation_hook doesn’t fire at all
  68. My ajax request don´t work and return 0
  69. WordPress environment not loading properly
  70. WordPress Add advertising ads befor and after content with periority [closed]
  71. plugin not hooking to my custom hook
  72. Populate select option with JSON file
  73. Can plugin automatically update if i hide the update notification?
  74. Why isn’t my plugin seeing other classes?
  75. how to create table during plugin installation in side a class
  76. Hook into install email
  77. Autoloading a PHP class – working outside, but not inside WordPress plugin
  78. How to add submenu to WordPress plugin in the same Directory of main Plugin?
  79. Saving an array to get_options
  80. Saving plugin data returns “You do not have sufficient permissions to access this page.”
  81. Why function hooked using object are executing at all time?
  82. How to Overwrite validate_plugin function
  83. Can anyone tell me why I can’t edit a plugin when it is installed without having to re-install?
  84. How do add_action and WP_Query
  85. Call current post parameters inside a plugin
  86. How to list posts that appear in two categories
  87. Pass strings to plugin function [closed]
  88. How use Dynamic hyperlink on each wordpress post?
  89. Send email notification when meet the condition
  90. Create WordPress category dynamically
  91. Function not being called on form submit, only blank admin-post.php page
  92. How can I save the selected page in the dropdown after anyone clicks on Save Changes?
  93. Gravity Forms and Gravity View Permissions
  94. How can I save the selected page in the dropdown after anyone clicks on Save Changes?
  95. wp_enqueue_script doesn’t load JS in plugin
  96. Shortcode cannot parse attributes within double quotes. ” is becoming ” breaking my shortcode
  97. Mixed results with is_page() WordPress function, when using $this, or self
  98. Read page- or post-content across different builder-plugins
  99. Is it possible to use Classes between WordPress plugins with separate namespaces?
  100. How to get next day date of a specific day