{"id":473,"date":"2015-02-25T17:52:09","date_gmt":"2015-02-25T17:52:09","guid":{"rendered":"https:\/\/www.codexworld.com\/?p=473"},"modified":"2015-04-20T17:05:19","modified_gmt":"2015-04-20T17:05:19","slug":"wordpress-adding-custom-fields-to-the-post","status":"publish","type":"post","link":"https:\/\/www.codexworld.com\/wordpress-adding-custom-fields-to-the-post\/","title":{"rendered":"WordPress – Adding custom fields to the post"},"content":{"rendered":"

WordPress has a way where developers can create custom fields to the post. With this way we can extend WordPress functionality and fulfill our requirement. This extra custom fields data is known as meta-data. Meta data allow you to add some additional data to the post.<\/p>\n

In this tutorial we will discuss how to create WordPress custom fields and insert some additional data to the post. This step by step tutorial provides you an easy way to add custom post meta box in WordPress.<\/p>\n

Now we will add a custom meta box into post adding page. Through this custom meta box we will insert the author name of post. Also we will display the author name of respective post at the post listing page or post details page.<\/p>\n

All the meta box related working will be done in theme’s functions.php<\/code> file. So, open the functions.php<\/code> file of current active theme and follow the below steps.<\/p>\n

Step 1: Adding Custom Meta Box<\/h2>\n

add_meta_box()<\/code> function is used to add meta boxes to the administrative interface. The below code is used for add meta box to the post.<\/p>\n

\/*
* Add the Custom Meta Box
*\/

<\/span>function <\/span>add_custom_meta_box<\/span>() {
    <\/span>add_meta_box<\/span>(
        <\/span>'custom_meta_box'<\/span>, <\/span>\/\/ $id
        <\/span>'Custom Meta Box'<\/span>, <\/span>\/\/ $title 
        <\/span>'show_custom_meta_box'<\/span>, <\/span>\/\/ $callback
        <\/span>'post'<\/span>, <\/span>\/\/ $page
        <\/span>'normal'<\/span>, <\/span>\/\/ $context
        <\/span>'high' <\/span>\/\/ $priority
    <\/span>); 
}
<\/span>add_action<\/span>(<\/span>'add_meta_boxes'<\/span>, <\/span>'add_custom_meta_box'<\/span>);<\/span><\/span><\/pre>\n
Step 2: Rendering Custom Meta Box<\/h2>\n
In the following code, we have generated an array of custom meta fields. Now we have to define the callback function (show_custom_meta_box()<\/code>) and generate the view of the meta box into this function (show_custom_meta_box()<\/code>).<\/p>\n
\/\/ Custom meta fields array
<\/span>$prefix <\/span>= <\/span>'custom_'<\/span>;
<\/span>$custom_meta_fields <\/span>= array(
    array(
        <\/span>'label'<\/span>=> <\/span>'Author Name'<\/span>,
        <\/span>'desc'  <\/span>=> <\/span>'Enter post author name to be displayed'<\/span>,
        <\/span>'id'    <\/span>=> <\/span>$prefix<\/span>.<\/span>'author_name'<\/span>,
        <\/span>'type'  <\/span>=> <\/span>'text'
    <\/span>)
);

<\/span>\/\/ The callback function
<\/span>function <\/span>show_custom_meta_box<\/span>() {

    global <\/span>$custom_meta_fields<\/span>, <\/span>$post<\/span>;
    
    <\/span>\/\/ Use nonce for verification
    <\/span>echo <\/span>'<input type=\"hidden\" name=\"custom_meta_box_nonce\" value=\"'<\/span>.<\/span>wp_create_nonce<\/span>(<\/span>basename<\/span>(<\/span>__FILE__<\/span>)).<\/span>'\" \/>'<\/span>;
     
    <\/span>\/\/ Begin the field table and loop
    <\/span>echo <\/span>'<table class=\"form-table\">'<\/span>;
    
    foreach (<\/span>$custom_meta_fields <\/span>as <\/span>$field<\/span>) {
        <\/span>\/\/ get value of this field if it exists for this post
        <\/span>$meta <\/span>= <\/span>get_post_meta<\/span>(<\/span>$post<\/span>-><\/span>ID<\/span>, <\/span>$field<\/span>[<\/span>'id'<\/span>], <\/span>true<\/span>);
        <\/span>\/\/ begin a table row with
        <\/span>echo <\/span>'<tr>
                <th><label for=\"'<\/span>.<\/span>$field<\/span>[<\/span>'id'<\/span>].<\/span>'\">'<\/span>.<\/span>$field<\/span>[<\/span>'label'<\/span>].<\/span>'<\/label><\/th>
                <td>'<\/span>;
                switch(<\/span>$field<\/span>[<\/span>'type'<\/span>]) {
                    <\/span>\/\/ text field
                    <\/span>case <\/span>'text'<\/span>:
                        echo <\/span>'<input type=\"text\" name=\"'<\/span>.<\/span>$field<\/span>[<\/span>'id'<\/span>].<\/span>'\" id=\"'<\/span>.<\/span>$field<\/span>[<\/span>'id'<\/span>].<\/span>'\" value=\"'<\/span>.<\/span>$meta<\/span>.<\/span>'\" size=\"30\" \/>
                            <br \/><span class=\"description\">'<\/span>.<\/span>$field<\/span>[<\/span>'desc'<\/span>].<\/span>'<\/span>'<\/span>;
                    break;
nbsp;               }
        echo <\/span>'<\/td><\/tr>'<\/span>;
    }
    
    echo <\/span>'<\/table>'<\/span>;
    
}<\/span><\/span><\/pre>\n
<\/span> Go to the post adding page and you can see the custom meta box and custom post fields under the post content editor. Into this field you can add the custom author name of the post.<\/p>\n
\"wordpress-custom-meta-box-fields-to-post\"<\/div>\n
Step 3: Saving Custom Meta Data<\/h2>\n
Now it’s time to save the meta data. The below code is use to save the post meta data.<\/p>\n
\/\/ Save the custom meta data
<\/span>function <\/span>save_custom_meta<\/span>(<\/span>$post_id<\/span>) {

    global <\/span>$custom_meta_fields<\/span>;
     
    <\/span>\/\/ verify nonce
    <\/span>if (!<\/span>wp_verify_nonce<\/span>(<\/span>$_POST<\/span>[<\/span>'custom_meta_box_nonce'<\/span>], <\/span>basename<\/span>(<\/span>__FILE__<\/span>))) 
        return <\/span>$post_id<\/span>;
        
    <\/span>\/\/ check autosave
    <\/span>if (<\/span>defined<\/span>(<\/span>'DOING_AUTOSAVE'<\/span>) && <\/span>DOING_AUTOSAVE<\/span>)
        return <\/span>$post_id<\/span>;
        
    <\/span>\/\/ check permissions
    <\/span>if (<\/span>'page' <\/span>== <\/span>$_POST<\/span>[<\/span>'post_type'<\/span>]) {
        if (!<\/span>current_user_can<\/span>(<\/span>'edit_page'<\/span>, <\/span>$post_id<\/span>))
            return <\/span>$post_id<\/span>;
        } elseif (!<\/span>current_user_can<\/span>(<\/span>'edit_post'<\/span>, <\/span>$post_id<\/span>)) {
            return <\/span>$post_id<\/span>;
    }
     
    <\/span>\/\/ loop through fields and save the data
    <\/span>foreach (<\/span>$custom_meta_fields <\/span>as <\/span>$field<\/span>) {
        <\/span>$old <\/span>= <\/span>get_post_meta<\/span>(<\/span>$post_id<\/span>, <\/span>$field<\/span>[<\/span>'id'<\/span>], <\/span>true<\/span>);
        <\/span>$new <\/span>= <\/span>$_POST<\/span>[<\/span>$field<\/span>[<\/span>'id'<\/span>]];
        if (<\/span>$new <\/span>&& <\/span>$new <\/span>!= <\/span>$old<\/span>) {
            <\/span>update_post_meta<\/span>(<\/span>$post_id<\/span>, <\/span>$field<\/span>[<\/span>'id'<\/span>], <\/span>$new<\/span>);
        } elseif (<\/span>'' <\/span>== <\/span>$new <\/span>&& <\/span>$old<\/span>) {
            <\/span>delete_post_meta<\/span>(<\/span>$post_id<\/span>, <\/span>$field<\/span>[<\/span>'id'<\/span>], <\/span>$old<\/span>);
        }
    }
}
<\/span>add_action<\/span>(<\/span>'save_post'<\/span>, <\/span>'save_custom_meta'<\/span>);<\/span><\/span><\/pre>\n
Step 4: Get Meta Data and Display the Custom Field Value<\/h2>\n
get_post_meta()<\/code> function returns the values of the custom fields with the specified key from the specified post. We will get all the custom meta data and display custom field value from custom meta data array by specific meta key.<\/p>\n
<?php 
    <\/span>\/\/ Get the post meta data
    <\/span>$meta <\/span>= <\/span>get_post_meta<\/span>( <\/span>get_the_ID<\/span>() );
    
    <\/span>\/\/ Get custom meta value
    <\/span>$post_author_name <\/span>= <\/span>$meta<\/span>[<\/span>'custom_author_name'<\/span>][<\/span>0<\/span>];
    
    echo <\/span>'Author: '<\/span>.<\/span>$post_author_name<\/span>;
<\/span>?><\/span><\/span><\/pre>\n
\n<\/span> You can see the custom meta field value into the post display. The custom author name of the respective post would be displayed.<\/p>\n
\"display-custom-meta-value-wordpress\"<\/div>\n","protected":false},"excerpt":{"rendered":"
WordPress has a way where developers can create custom fields to the post. With this way we can extend WordPress functionality and fulfill our requirement. This extra custom fields data is known as meta-data. 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