wp_redirect() function is not working

I had same problems here, I just try any method like

add_action( 'init', 'my_function_name'); or add_action( 'wp_head', 'my_function_name'); but it's not working

finally i got hook that can work with perfectly redirect, below my full code in functions.php

function redirect_homepage(){
    ob_clean();
    ob_start();
    $args = array(
        'public'   => true,
        '_builtin' => false,
     );
    
     $output = 'names'; // names or objects, note names is the default
     $operator = 'and'; // 'and' or 'or'
    
     $post_types = get_post_types( $args, $output, $operator ); 
        if(is_singular($post_types)){

            $url = get_bloginfo('url');
            wp_redirect($url, '301');
            exit();
    }
}
add_action( 'template_redirect', 'redirect_homepage');

just use hook add_action( 'template_redirect', 'my_function_name');

Nb: i use child-theme

header already sent is main reason. As header already sent, so its unable to resend it and fails to redirect. Use before header like in init hook.

add_action('init', 'your_app_function');

if( is_page( ['wfp-dashboard', 'wfp-checkout'] ) ){
   if(!is_user_logged_in()){
      @ob_flush();
      @ob_end_flush();
      @ob_end_clean();
      wp_redirect( wp_login_url() );
      exit();
   }
}

Make sure you don't have: get_header(); or any wordpress function that potentially creates contents like header and footer in your template. Otherwise the redirection won't work.

Some developers try to clear the page by using ob_start(); but if you have content in your page even if you use ob_start(); the redirection won't work.

and then simply try this code:

wp_redirect(get_permalink($post->ID));
exit;

I have a simple solution, please read:

1. If you are using wp_redirect($url) in theme files, and it is not working add ob_clean() ob_start() in your function file on top.

2. If using in plugin add ob_clean() ob_start() in the main plugin file on top.

And make sure you have added exit() function after wp_redirect($url) Like this:

$url = 'http://example.com';
wp_redirect($url);
exit();

I am not sure if this will help... but I found that I had some code in a template and I was starting with get_header() in this way:

<?php
/**
 * .. Template comments
 */

 get_header();

 if(...) {
    ...
    if(...) {
      ...
      wp_redirect($url);
      exit();
    }
 }
 ?>

and was getting the same issue of header previously sent... What I did was just move get_header() to the end of the block and voila!!!

<?php
/**
 * .. Template comments
 */


 if(...) {
    ...
    if(...) {
      ...
      wp_redirect($url);
      exit();
    }
 }
 get_header();
 ?>

No plugin was disabled. and everything was ok... you may give a try if this works for you

Two things wrong here:

1. Don't use $post->guid as an url
2. You must exit() after using wp_redirect() (see the Codex)

   wp_redirect() does not exit automatically and should almost always be followed by exit.

To redirect to your new post's page:

//..... code as in question
$post_id = wp_insert_post($new_post);
$url = get_permalink( $post_id );
wp_redirect($url);
exit();

Never ever use the post GUID value, it does not have to match the real URL of the post.

http://codex.wordpress.org/Changing_The_Site_URL#Important_GUID_Note

wp_redirect( get_permalink( $post_id ) );
exit(); // always exit

Also, make sure wp_redirect is not plugged by something else which prevents it from doing its job correctly. Deactivate all plugins and revert to Twenty Ten/Eleven to check.