Automatically Set the WordPress Image Alt-Text,Title & Other Meta

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When you upload a new image into the WordPress media library, it automatically generates a Title for your new image based on the underlying file name.

Detailed Instructions

Follow these steps:source https://brutalbusiness.com/list-of-brutally-great-wordpress-plugins/

  1. Rename your image files to a short, meaningful phrase.  Don’t worry about dashes, underscores or extra spaces, the code will clean those up.
  2. Copy the PHP code below and place it in your theme’s functions.php file
  3. Upload your image files into the WordPress media library.  The Edit Media screen will be automatically pre-populated as desired.
    /* Automatically set the image Title, Alt-Text, Caption & Description upon upload
    --------------------------------------------------------------------------------------*/
    add_action( 'add_attachment', 'my_set_image_meta_upon_image_upload' );
    function my_set_image_meta_upon_image_upload( $post_ID ) {
    
    	// Check if uploaded file is an image, else do nothing
    
    	if ( wp_attachment_is_image( $post_ID ) ) {
    
    		$my_image_title = get_post( $post_ID )->post_title;
    
    		// Sanitize the title:  remove hyphens, underscores & extra spaces:
    		$my_image_title = preg_replace( '%\s*[-_\s]+\s*%', ' ',  $my_image_title );
    
    		// Sanitize the title:  capitalize first letter of every word (other letters lower case):
    		$my_image_title = ucwords( strtolower( $my_image_title ) );
    
    		// Create an array with the image meta (Title, Caption, Description) to be updated
    		// Note:  comment out the Excerpt/Caption or Content/Description lines if not needed
    		$my_image_meta = array(
    			'ID'		=> $post_ID,			// Specify the image (ID) to be updated
    			'post_title'	=> $my_image_title,		// Set image Title to sanitized title
    			'post_excerpt'	=> $my_image_title,		// Set image Caption (Excerpt) to sanitized title
    			'post_content'	=> $my_image_title,		// Set image Description (Content) to sanitized title
    		);
    
    		// Set the image Alt-Text
    		update_post_meta( $post_ID, '_wp_attachment_image_alt', $my_image_title );
    
    		// Set the image meta (e.g. Title, Excerpt, Content)
    		wp_update_post( $my_image_meta );
    
    	} 
    }