update featured image meta data information in wordpress

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I’m creating post in wordpress via external api from my php api. I’ve been able to create post and set feature image for it, but I need to know on how to update following information :

  • image alt text
  • image caption
  • image title

this question might sound stupid, but I didn’t find strong sample for the solution.

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  1. You can try this one:
    if you image file has the meta data, you can use the following function to generate the data automatically.

    // Define attachment metadata 
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );

    Find more about the variables the above function generates in the following link
    https://codex.wordpress.org/Function_Reference/wp_generate_attachment_metadata

    If the file does not have meta, You have form as an array manually like the following one. 

    $attach_data = array(); 
$attach_data["image_meta"]["caption"] ='';
$attach_data["image_meta"]["title"] ='';

    You can get an idea about an image’s metadata variables in the following link.
    https://codex.wordpress.org/Function_Reference/wp_read_image_metadata#Return_Values

    Finally update the values as metadata to that attachment.

    // Assign metadata to attachment
wp_update_attachment_metadata( $attachment_id, $attach_data );

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