Can an AJAX callback function access a PHP variable which was defined during initial page load?

Based on comments in this thread, I think using a WordPress transient to store the value of $myvar is the best solution in my case. One reason is because in my case, the browser does not need to know the value of the variable.

Here is some more information to make an informed decision in your specific use case:

  • This separate Stack Exchange question has an answer which provides more information on all the ways to persist data in WordPress, including the use of transients.
  • This link has more info on specific options.
  • PHP sessions don’t seem to be suggested for WordPress uses (see the previous two links). But this link has more info on them.

Related Posts:

  1. username_exists() function can’t be access without logging in
  2. Can i check if user is doing any ajax request?
  3. How to add default images into theme customizer image control?
  4. Is the regular ajax request method safe or I should use admin-ajax.php?
  5. Validate a users email address when using gmail to register
  6. Click loads template via ajax
  7. How to speed up admin-ajax.php in wordpress
  8. get post based on category chosen in drop down – The ajax method
  9. How to store data from multiple forms using ajax and php
  10. PHP 8, AJAX mail form to function.php doesn’t work
  11. Ajax request not sending to server and returning – wp-admin/admin-ajax.php 400
  12. Why ajax doesn’t work on certain wordpress hooks?
  13. Is it possible to intercept all ajax requests and get the parameters and the returns?
  14. dynamic dependent select dropdown
  15. how to make custom ajax handler?
  16. How to disable controls in theme customizer?
  17. is_user_logged_in() not working in AJAX validation call
  18. Using data sent via AJAX in multiple functions on a WP plugin
  19. Function won’t run onclick using Ajax
  20. Simple AJAX notification when the new post is added to the database
  21. Why i can’t get custom fields value or post ID via Ajax?
  22. Post not populating for custom post type based on category selection
  23. How to get post category list as select in front-end?
  24. Is there a hack for using is_page() within the function.php file?
  25. Execute Jquery when a specific page in my plugin is loading
  26. AJAX function not working [closed]
  27. Disclaimer that will show every refresh of the page
  28. Database entry removed on browser refresh, Ajax PHP jQuery
  29. Store ajax data in PHP variable
  30. Multiple AJAX handler functions conflict in functions.php
  31. Ajax filter with loadmore button
  32. How to change this ajax function to submit to the default wordpress content area instead of the custom field ‘seller notes’?
  33. register_block_type is not working properly
  34. get_the_author_meta( ‘ID’ ) just return 1
  35. Update $wpdb query with AJAX
  36. WordPress Ajax filter: Create two loops for different output styles?
  37. Need help with AJAX login to call php in functions.php to handle redirects based on user cap (role)
  38. Offset with ajax load more posts duplicates
  39. ajaxurl usage for a custom function
  40. How to call a function from functions.php with ajax?
  41. Custom Post type Ajax search results
  42. Find the method which AJAX GET calls
  43. AJAX Returning Way Too Many Posts
  44. wordpress ajax return 0
  45. wp_delete_comment is doing nothing
  46. Modify category archive page loop on functions.php
  47. Registration form not registering First and Last name
  48. Modify php code to pass a page id as a parameter in order to create a breadcrumb
  49. ajax form function error
  50. AJAX: WordPress filters inside $html do not work as intended
  51. I got this error POST https://localhost/meraboilerwp/[object%20Object] 404 (Not Found)
  52. How can I display a Divi content inside a modal based on an AJAX request
  53. ajax, right way to do it and make it works?
  54. How to remove the cufon script from Dzonia Lite theme [closed]
  55. How to remove or change the “W” icon in “My Sites”?
  56. get a simple array of all of the term names that exist in all taxonomies
  57. Login/logout in header
  58. How to display posts by current user in a drop down
  59. Logged in user ID as post ID
  60. How does WordPress insert Paragraphs in posts
  61. WordPress Access allowed to fewer pages till user logs in
  62. Linking text within textarea of custom meta box
  63. Show css depending on activity type in BuddyPress activity-loop [closed]
  64. only show container with next/prev links if they exist?
  65. How to combine wordpress_logged_in cookies in one cookie?
  66. Populate dropdown with Child Pages based on Parent Page chosen
  67. How can I remove a function that has been added to wordpress with add_filter?
  68. Change the WP Video Shortcode Output
  69. Show categories then when clicked on a category list all sub category and when clicked show all posts in that sub category
  70. remove wp floating submenu in wp dashboard
  71. How to put “Read more” link in Custom Excerpt inside p tag?
  72. Two Different Links for Same Product – WooCommerce [closed]
  73. Ajax load more posts with multiple tax query
  74. Ajax call not working
  75. ACF: how do I get the fields and its values of a specific group?
  76. How to control WordPress image metadata (using Imagick)?
  77. WordPress Sending data to Ajax with select option
  78. How to add seperate classes to no-search-result and found-search-result pages on wordrpess search – is_search()
  79. Get value from shortcode to do something
  80. AJAX load more for different custom post type loops
  81. How do I add custom bulk actions to multiple custom post types?
  82. Error when adding excerpt to the content through functions.php
  83. Automatically adding new post categories to menu
  84. Add data attribute to each li in menu
  85. WordPress ajax doesn’t display object method on jQuery .change() function
  86. Get post id in a function when edit/add a post
  87. Making BuddyPress Activity Stream (Post Type) Featured Images Clickable [closed]
  88. How to check if a meta value has already been assigned to any user?
  89. Ajax loaded form replaces form action with Ajax url
  90. Ajax category filtering products default show all
  91. How to complete two other input fields, completed the first
  92. prevent default not stopping page refresh. Passing form information to and from php with ajax in a wordpress site
  93. Prev/Next child navigation for current page modifications?
  94. Adding rel tag to all external links
  95. Status 400 for AJAX POST Request with admin-ajax.php
  96. Problem with custom plugin using AJAX to pull info from php file
  97. How can I apply_filters from inside a function?
  98. function to assign user role based on a field from usermeta
  99. what is the best practice to add new field to an api route
  100. Gutenberg block – Save PHP function’s output as HTML?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)