pre_post_(field) │ filter-hook │ WP 1.0

Usage

add_filter( 'pre_post_(field)', 'wp_kama_pre_post_field_filter' );

/**
 * Function for `pre_post_(field)` filter-hook.
 * 
 * @param  $value 
 *
 * @return 
 */
function wp_kama_pre_post_field_filter( $value ){

	// filter...
	return $value;
}

$value

-

Where the hook is called

$value = apply_filters( "pre_post_{$field}", $value );

Where the hook is used in WordPress

add_filter( 'pre_post_mime_type', 'sanitize_mime_type' );