File lib/core/post.php

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<?php

/**
 * Get post or page id from a object.
 *
 * @param  mixed $post_id
 *
 * @return int
 */
function papi_get_post_id( $post_id = null ) {
    if ( is_object( $post_id ) && isset( $post_id->ID ) ) {
        return $post_id->ID;
    }

    if ( is_numeric( $post_id ) && is_string( $post_id ) && $post_id !== '0' ) {
        return intval( $post_id );
    }

    if ( is_null( $post_id ) || intval( $post_id ) === 0 ) {
        if ( isset( $_POST['action'] ) ) {
            if ( $_POST['action'] === 'query-attachments' && isset( $_POST['query']['item'] ) ) {
                return intval( $_POST['query']['item'] );
            }
        }

        if ( get_post() ) {
            return get_the_ID();
        }

        if ( $value = papi_get_qs( 'post' ) ) {
            return is_array( $value ) ? 0 : intval( $value );
        }

        if ( $value = papi_get_qs( 'page_id' ) ) {
            return intval( $value );
        }

        return intval( $post_id );
    }

    return intval( $post_id );
}

/**
 * Get post parent id.
 *
 * @return int
 */
function papi_get_parent_post_id() {
    return intval( papi_get_qs( 'post_parent' ) );
}

/**
 * Get WordPress post type in various ways
 *
 * @param  int $post_id
 *
 * @return string
 */
function papi_get_post_type( $post_id = null ) {
    if ( $post_type = papi_get_or_post( 'post_type' ) ) {
        return $post_type;
    }

    $post_id = papi_get_post_id( $post_id );

    if ( $post_id !== 0 ) {
        return strtolower( get_post_type( $post_id ) );
    }

    $page = papi_get_qs( 'page' );

    if ( is_string( $page ) && strpos( strtolower( $page ), 'papi-add-new-page,' ) !== false ) {
        $exploded = explode( ',', $page );

        if ( empty( $exploded[1] ) ) {
            return '';
        }

        return $exploded[1];
    }

    // If only `post-new.php` without any querystrings
    // it would be the post post type.
    $req_uri  = $_SERVER['REQUEST_URI'];
    $exploded = explode( '/', $req_uri );
    $last     = end( $exploded );

    if ( $last === 'post-new.php' ) {
        return 'post';
    }

    return '';
}

/**
 * Get post type label.
 *
 * @param  string $post_type
 * @param  string $label
 * @param  string $default
 *
 * @return string
 */
function papi_get_post_type_label( $post_type, $label, $default = '' ) {
    if ( ! post_type_exists( $post_type ) ) {
        return $default;
    }

    return get_post_type_object( $post_type )->labels->$label;
}

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Functions