How to call function from one function in WordPress plugin? - php

Question

How can I call specific function in plugin in admin page.
I am submitting a form in WordPress plugin. On submitting I want to check validity of key which is entered in the form. I have a function which checkes the validity of the key. I want to call that function from the function of the form.
I have tried few things but it gives me error of
Using $this when not in object context
Here is my code
class WP_Cms_Plugin{
function __construct() {
add_action( 'admin_menu', array( $this, 'cms_options_panel' ));
}
function cms_options_panel() {
add_menu_page('CMS', 'Cms', 'manage_options', 'cms-dashboard', array(__CLASS__,'cms_setting_form'), 'dashicons-building');
}
function cms_setting_form()
{
if(isset($_POST['btn_submit']))
{
$secret_key = $_POST['project_secret_key'];
if($secret_key=='' || empty($secret_key))
{
$error['project_secret_key'] = 'Please enter Secret Key.';
}
if(empty($error)){
call to cms_check_key();
echo "Key validated successfully";
}
else
{
echo "Please use proper Key";
}
}
?>
<form method="post">
<div>Secret Key</div>
<input type="text" name="project_secret_key" value="<?php echo esc_attr( get_option('cms_secret_key') ); ?>" required/>
<?php submit_button('Submit','primary','btn_submit'); ?>
</form>
<?php
}
function cms_check_key($secret_key)
{
code to check validity
}
}
$cmsservice = new WP_Cms_Plugin();

Answer 1

The issue is your callable specifies using the WP_Cms_Plugin class and not an instance of it (object).
Either change your cms_options_panel function to:
add_menu_page('CMS', 'Cms', 'manage_options', 'cms-dashboard', array($this,'cms_setting_form'), 'dashicons-building');
(replace __CLASS__ with $this)
Or try a static function
static function cms_check_key($secret_key)
and then call WP_Cms_Plugin::cms_check_key($secret_key) from the form.
PHP Static Keyword