wordpress functions dosn't work -

i have form grabs data users , save blog post.

the form action goes page:

wp-content/plugins/formplugin/savepost.php 

but in page when try save post wp_insert_post($args), error happens:

"call undefined function wp_insert_post() in d:\easyphp-5.4.0rc4\www\wp2\wp-content\plugins\formplugin\savepost.php on line 18". 

is there missing?

if(isset($_post['send'])){      $args=array(         'post_name'      => $_post['postname'],         'post_title'     => $_post['postname'],         'post_status'    => 'publish',         'post_type'      => 'post',         'post_excerpt'   => $_post['postdesc']     );     wp_insert_post($args); } 

include wordpress in external files:

it looks using external file outside scope of wordpress. if file in plugins folder, doesn't mean wordpress knows it.

you can include wordpress external file adding this:

<?php  define( 'wp_use_themes', false ); require_once( '/path/to/your/wp-blog-header.php' ); 

at top of file. wp-blog-header.php should located in wordpress root folder.

alternative:

but since using wordpress, why not construct pretty url , use hook intercept form posting, instead of pointing external file?

things consider:

you should consider using filter_input instead of $_post.

i recommend using wordpress nonces.

it's rule validate , sanitize user input. here's starting point on matter.