Wordpress - Write <?php ?> inside echo -html text box

Question

I need to retrieve the meta value from db to the custom meta box I've created.

Here is my code.

 function wpl_owt_book_function( $book ) {

    define("_FILE_", "_FILE_");

    wp_nonce_field( basename(_FILE_), "wp_owt_cpt_nonce");

    echo "<label for='txtPublisherName'>Publisher Name</label>";
    $publisher_name = get_post_meta($post->ID, "book_publisher_name" , true);
    echo "<input type ='text' name = 'txtPublisherName' value = '<?php $publisher_name; ?>' placeholder = 'Publisher Name' />";
}

The result output from the text box makes place holder as <?php and outside the text box ") placeholder = 'Publisher Name' />"

Can anyone look into this matter and give me a solution please!

Have a great day!

Your last echo won't echo what you expect. You can't have opening and closing PHP tags inside an echo (which already is inside php tags). To concatenate a variable in a string, use: echo "something " . $foo . " something";. — M. Eriksson
– M. Eriksson, Commented Dec 30, 2019 at 10:44
Hi Magnus, Thanks for your quick response. Do you have any solution for that? — Private the Penguin
– Private the Penguin, Commented Dec 30, 2019 at 10:45
I added an example to the comment. I would also recommend reading up about how to use strings. This is one of those "PHP 101" knowledge you need to know. — M. Eriksson
– M. Eriksson, Commented Dec 30, 2019 at 10:46

delboy1978uk · Accepted Answer · 2019-12-30 10:46:35Z

2

You are already in PHP, so change this:

echo "<input type ='text' name = 'txtPublisherName' value = '<?php $publisher_name; ?>' placeholder = 'Publisher Name' />";

To this! (removing PHP tags)

echo "<input type ='text' name = 'txtPublisherName' value = '" . $publisher_name . "' placeholder = 'Publisher Name' />";

answered Dec 30, 2019 at 10:46

delboy1978uk

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3 Comments

Private the Penguin Over a year ago

Hi Magnus. Thanks for your generous reply. I replaced it with your code. But the meta value hasn't retrieved to text box

delboy1978uk Over a year ago

Shouldn't $post->ID be $book->ID ? $post is not defined anywhere

Private the Penguin Over a year ago

Thanks Mate!. It worked. I changed $book into $post

Brijesh Dhanani · Accepted Answer · 2019-12-30 13:21:40Z

0

You need to replace $post->ID with get_the_ID(). so, replace

get_post_meta($post->ID, "book_publisher_name" , true);

with

get_post_meta(get_the_ID(), "book_publisher_name" , true);

and also replace

echo "<input type ='text' name = 'txtPublisherName' value = '<?php $publisher_name; ?>' placeholder = 'Publisher Name' />";

with

echo "<input type ='text' name = 'txtPublisherName' value = '".$publisher_name."' placeholder = 'Publisher Name' />";

answered Dec 30, 2019 at 13:21

Brijesh Dhanani

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