Briefly understand the usage of update_option() function in WordPress development_php skills

Function introduction

update_option() is used to update the option values ​​​​that exist in the data table. This function can replace add_option, but is not as flexible as add_option. update_option will check and determine whether the option already exists. If it does not exist, add the option using add_option ('option_name', 'option_value'). Unless the user needs to specify the option parameters of add_option, update_option() is a dual-purpose function that can add and update options at the same time.
Note: update_option() cannot update when wp_load_alloptions is about to load (or not load) an option. In this case, delete_option should be used after using the update_option() function.

Function usage

<&#63;php update_option( $option_name, $newvalue ); &#63;>

Function parameters

$option_name

(String) (Required) The name of the option that needs to be updated. Valid default options that can be upgraded are listed in the Option Reference.

Default value: None

$newvalue

(Mixed) (Required) The new value for the current option name. The new value can be a string, array, object, or serialized value.

Default value: None

Function instance

Updated the value of option name myhack_extraction_length to 255. If this option does not exist, use the add_option function and set the value of autoload to no.

<&#63;php
$option_name = 'myhack_extraction_length' ; 
$newvalue = '255' ;
 if ( get_option($option_name) ) {
  update_option($option_name, $newvalue);
 } else {
  $deprecated=' ';
  $autoload='no';
  add_option($option_name, $newvalue, $deprecated, $autoload);
 }
&#63;>

Source file

update_option() is located in wp-includes/option.php.