How does child theme functions.php work with parent theme functions.php? Is it like CSS? [duplicate]

The comparison of CSS and functions.php files is pretty flawed. PHP doesn’t “cascade”.

To answer your question, both files are loaded, child theme functions.php first then the parent’s.

What happens if you want to have the function in the child theme
override a function in the parent theme and the parent theme is not
using if statements like the codex recommends?

You mean, if the parent function is not wrapped in function_exists conditional? Then you can’t override the function. That is basic PHP. Try to re-declare a function and you will get an error. You can’t get around that. The best you can do is hope for a filter that will let you do what you need, and contact the parent theme developer.

This answer might be of interest.
Or this one

Related Posts:

  1. remove_action on after_setup_theme not working from child theme
  2. How to load scripts/styles specific for a page
  3. Is there any global functions.php file which works for any theme?
  4. Child theme – Overriding ‘require_once’ in functions.php
  5. Display random categories on the front page (Finding and Editing Theme Functions)
  6. Issue with get_theme_mod returning a blank value instead of the saved value
  7. Hourly Routine Not Firing ( wp_schedule_event() )
  8. which is the function that removes accented vowels?
  9. Theme Demo in live Site
  10. Customising widget titles/headings in WP 5.8
  11. Child Theme Not Overriding Parent Theme
  12. Where does function_exists() look to decide whether a function exists? [closed]
  13. Theme-Config tab in admin Pannel?
  14. Is It wrong to use oop approach on functions.php?
  15. PHP files included in functions.php don’t seem to work
  16. How to remove howdy dropdown menu content
  17. Hook specific functions if on a specific admin page
  18. How can I change the do_action function in footer (copyright area)
  19. functions.php mistakenly deleted
  20. Echo tags used to describe the theme
  21. is_customize_preview() like function to check if Customizer “Live Preview” in JavaScript
  22. changing behaviour of get_search_form
  23. Child Theme files – what is needed?
  24. How to load jQuery in the footer – nothing works for me
  25. Problem only while using require_once() within functions.php
  26. Translation of theme using child theme
  27. How to stop twenty fifteen theme from cropping featured images?
  28. Theme functions.php file auto delete everyday [closed]
  29. How to remove style attribute in WordPress RSS output?
  30. WordPress website Rs changed to currency symbol
  31. Is there an alternative to get_template_directory_uri()?
  32. create filter in functions.php
  33. Add Custom Background Properties to Customizer
  34. Functions in custom theme
  35. Parse error after modifying the template menu [closed]
  36. WordPress PHP Conflicting User Sessions
  37. Function that outputs second theme url
  38. Not all CSS elements transferring via parent to child?
  39. unnecessary request call for js and css after calling wp_dequeue_script
  40. Some questions about how proper add 2 CSS file in a WordPress theme?
  41. Turn get_posts as string into an array for use in theme admin options
  42. Filter nav menu items HTML tags and wrap inner text with span
  43. Can’t switch to a child theme using filters template, option_template and option_stylesheet
  44. Redirect website domain (including all pages) to external URL after Popup message (few seconds)
  45. Getting the teaser text without overriding global variables
  46. Default Nav Highlight
  47. “options.php” not found
  48. How to override this theme function in child theme
  49. get_template_directory() – references parent theme directory
  50. Why a SlideShow (made using JQuery FlexSlider) can’t work if I load it form functions.php but work if I load it from my footer.php file? [closed]
  51. Why I can’t load my JavaScripts using an hook inside my functions.php file?
  52. How do I preserve changes to a theme’s functions.php across updates?
  53. What function actually renders the wp_admin_bar ? How can I call it?
  54. Astra theme – cannot set short product description under the product title (product name)
  55. Header menu aligned right on all pages except for single-post page [closed]
  56. Class parameter in get_avatar args doesn’t get added to output
  57. CSS style and app.js not loading
  58. Setting Up Child Theme To Take Priority
  59. Shortcode Initialization in a Custom Theme
  60. Getting back a blank WordPress site following functions code edit
  61. us states dropdown function and echo in theme template files
  62. How to pass a variable from a template page to the child theme functions.php
  63. Random text changing to weird icons in both admin & front end
  64. Register a widget area when a theme option has been saved?
  65. Additional Sidebar
  66. Add custom css to theme
  67. Which template file to edit to edit homepage in Mystile [closed]
  68. Adding function to function.php error 505 [closed]
  69. How to get postId from the argument $block when register_block_type()?
  70. My website is generating weired url parameters of paginated pages
  71. How to automatically load Google Fonts on pages only as they’re used?
  72. Issue with wp_get_attachment_image() and SVG file type
  73. deregister scripts on certain page
  74. How to create a widgetized sidebar for every category dynamically?
  75. Hide some items from Screen options in dashboard for products
  76. edit role display name and label name without plugins
  77. is_plugin_active() not properly returning true
  78. Converting html to wordpress images not showing
  79. Move Post to different category if post_meta field is 0 or is 2 days old?
  80. How would I go about replacing this function in my child theme located in inc/template-tags.php
  81. Condition OR for current user ID
  82. Retrieve a value from Yoast SEO to use to set a default twitter card image honoring overrides
  83. If user is logged-in display/hide something
  84. Visual Composer creating own shortcodes with vc_map() to return simple Image
  85. Adding javascript to functions.php causes problems with my template
  86. How to Extend login session times to a Month
  87. Prevent WordPress Automatic Logout
  88. How add body_class from wp_termmeta
  89. Modify function to only return values for the user that’s logged in
  90. WordPress performance – send all metaboxes to function or to call it again
  91. Display a list of random terms from custom taxonomy with shortcode
  92. remove_action from parent theme using child theme functions.php
  93. wp enqueue style on about us page
  94. CF7 select value get to function and reciept value from function
  95. Adding a class to the body of an inactive site using multisite
  96. Setting Active Nav item (of Pages) when you are on a Post with Category
  97. How to disable site title and description when custom header is uploaded on the customizer?
  98. Increase Comment Author Gravatar Size On WordPress Default Comment Function
  99. pluggable function in theme, to be overridden by plugin
  100. Hiding Google Analytics code based on theme options
error code: 523