As @karpstrucking mentioned in the comments, the problem was in the end with my function: my_string_manipulation_function() I was using preg_replace() to process the string of native language character, but I didn’t used the /u flag modifier to specify that I’m working with unicode characters. Adding this flag fixed all weird behaviour.
Sanitize html, where to sanitize
Well, I never got any input on this and ended up going with the function sanitize_title which is more restrictive than I want (processes the title to be used in a URL — essentially returns a slug for the post), but it’s the best solution I’ve been able to find. By running both the 3rd-party … Read more
The more elaborate data is, the harder it is to both formulate and implement sanitization process. For a number this might be as simple as “integer” and (int)$number. For HTML this is highly not trivial with different possibilities of desired scope (no HTML tags? some blacklisted tags? some whitelisted tags? what about embedded scripts? CSS?) … Read more
You need to escape data while displaying also. Use esc_attr in your case. Try this: <input type=”text” name=”field_name” value=”<?php echo (!empty($field)) ? esc_attr( $field ) : ”; ?>” /> Check this for full documentation – https://codex.wordpress.org/Data_Validation
I’m not sure if this is a bug, but it need further investigation. I’ve run a few quick tests on the name field in a tax_query, and whenever a term name has got a special character or have more than one word, the tax_query is excluded from the SQL query TEST 1 I have use … Read more
Escaping and sanitization
I’m not sure if this is a bug, but it need further investigation. I’ve run a few quick tests on the name field in a tax_query, and whenever a term name has got a special character or have more than one word, the tax_query is excluded from the SQL query TEST 1 I have use … Read more
I belive all your numbers are saved as array to your option. So get_option($this->plugin_name.’cc’) should give you an array $options. While adding get this array first, insert a new element to the array $options[] = ‘new element’ ; . Now save this array to your option again with modified $options.
Yes, you can validate data using jquery before submitting form. There is a way custom way to do that by checking the fields value length `$(document).ready(function(){ $(“#form”).submit(function(){ var field_value = $(‘input[name=”some_name”]’).val(); if(field_value.length>0){ return true; } else{ return false; } }); });` Or you can use a jquery validation library. https://jqueryvalidation.org/