How to modify URL (add GET values) after front end form submission?

try this : 

// constructing URL
$url = add_query_arg(["submission" => "success"]);

// redirection
wp_redirect($url);
exit();

Related Posts:

  1. How can I modify the permalink via a filter?
  2. Newbie question: no index.php? in my plain wordpress permalink
  3. Change links automatically to affiliate links
  4. Rewrite sub folder dynamically with country code in WordPress using PHP
  5. Use WordPress’ URL rewrite engine
  6. Rename “Portfolio” slug?
  7. How to rewrite URL with PHP variables with htaccess to a normal looking URL?
  8. Static variable and add_rewrite_rule?
  9. Nesting if statements to echo only one string based on what tag was filtered?
  10. How to change home or site url using action hooks or filter?
  11. Why do WordPress rewriites seem to work differently for posts vs pages?
  12. Performance impact of rewriting WordPress URLs
  13. Is sanitize_title_with_dashes formatting function too liberal (in terms of accepted characters)?
  14. Changes in permalink structure in WordPress and how to apply to in-site links
  15. WordPress Persistent connection rule does not work for “posts”
  16. Append query string to all URL’s
  17. custom rewrite rule help! Custom rewrite rules not applying to custom post type
  18. subdirectory index.php is not working
  19. Use URL Rewrite as well as $_GET parameters in URL?
  20. parts of url disappear when using # inside href=”” [closed]
  21. Create custom permalinks to show Custom Post Type’s relationship?
  22. Add .htm extention to a custom taxonomy
  23. Help with .htaccess and Login with Subfolders
  24. WordPress add_rewrite_rules for custom URLs ending in .html
  25. Rewrite with pagination /foo/page/2/ to posts of a given category, page 2
  26. Divi change project category slug
  27. How to add a rewrite endpoint to unattached media?
  28. How do i add slugs to a URL, but still redirecting to the same page
  29. Nginx WordPress and another Web app URL structure
  30. Custom post type url Rewrite (conflicting with page url)
  31. WordPress Rewrite Rule
  32. Why is home page content not displaying with this rewrite rule?
  33. Modifying WP URL handing code?
  34. How to deal with a GET variable of ‘name’?
  35. How to define a rule in functions.php that ONLY disables the default wp functionality that undesirably changes ‘&’ to ‘#038;’?
  36. How to pass username in affiliate link in wordpress website
  37. Test the existence of a page/article by its URL, taking in consideration the URL rewriting by filters
  38. url not using query string no longer working
  39. Current WordPress Page Title as Search Parameter into A Tag
  40. How does one make a URL return dynamic JSON with custom Content Type?
  41. URL rewrite rule
  42. How does WordPress rewrite URLS using its PHP scripts
  43. How can I turn a url with get method as a clean url with segment as the get method?
  44. WordPress Rewrite Issue
  45. How to print redirected query string variables to the page?
  46. Multiple URL from Custom post name
  47. Why isn’t my custom function kicking in from my functions.php file?
  48. Difference in Get Variable Location
  49. WordPress adding in site URL to header links
  50. Dynamically append custom post type to end of url
  51. WordPress add parameters with friendly url structure
  52. Custom taxonomy with page post type – WordPress
  53. Remove slug of multiple custom post types with and without hierarchical
  54. How to trigger WooCommerce order complete email?
  55. What is This esc_html_e() i wordpress php?
  56. Menu Items Disappearing
  57. Wrong UTC and local time only on wordpress
  58. Jquery ajax to custom php file: returning blank data
  59. admin-ajax.php returning error 400 namespaced callback
  60. Performance issues with large website [closed]
  61. wordpress the_post_thumbnail() not cropping properly
  62. How to display to visitor which site they came from?
  63. Changing custom logo link
  64. How to query for posts with a null or blank post_name?
  65. What is the correct way to write this conditional statement?
  66. Grab posts by multiple categories
  67. edit search.php to include subdomain posts
  68. Loading php file with AJAX in WordPress frontend
  69. Asynchronous multiple requests 401 Unauthorized
  70. WordPress archive page showing 404 Error [duplicate]
  71. Division by zero error in image.php
  72. How do I include SVG file used as featured image?
  73. WordPress loop by meta key that is an array? and how loop multiple arrays
  74. Adding regular php file to site
  75. Remove slugs from custom posts type
  76. Simple jQuery AJAX Request fails to run PHP Script
  77. Pass important values server-side when processing form
  78. Wp_editor doesn’t send the required data
  79. pass html code to worpdress
  80. Can ‘Custom Field’ data be inserted into this Short Code?
  81. Merge 2 product attribute terms
  82. global $product is empty string when passed into function
  83. How to update custom fields when post is published?
  84. wpdb->query returns different value to phpMyAdmin
  85. Trouble Accessing Gravity Forms API (GFAPI)
  86. Add a default style if no Featured image is selected
  87. setcookie() issues on running with HTTPS on WordPress
  88. Querying posts from wordpress with 2 or more conditionals
  89. Importing demo data in Multisite
  90. Posts with Custom Fields does not appear
  91. How to export database correctly for local to online
  92. Replace TinyMCE with Custom Built Editor
  93. Setting field not saving on front-end
  94. Getting custom field data from cart page to checkout page in woocomerce [closed]
  95. php grabbing every post made?
  96. How to cut a section of a URL from a string with a regular expression?
  97. Too few arguments at registering new templates in my plugin
  98. Limit a search box by CPT + taxonomies, in only one page
  99. How to edit a widget code?
  100. Help writing out comments and replies