Add post title as alt tag for featured image

Question

How do I add post title as alt tag in a post? I tried using array(title => '.the_title.') but it didnt work. I think I am not suppose to use the_title. I tired using get_the_title as well.

Thanks

Answer 1

@its_me got it almost right. Those args must be 2nd resp. 3rd Parameter, not first:

$attr = array(
    'title' => 'howdy partner',
    'alt'   => 'a nice view of the ocean',
);

// pick one, note 2 or 3 arguments:
the_post_thumbnail( 'post-thumbnail', $attr );

echo("<a href='$p->permalink'>". // null for current $post->ID (use within loop)
    get_the_post_thumbnail( null, 'post-thumbnail', $attr ).
    "</a>");

Answer 2

Try using this <?php the_title(); ?>

Here is example -

<img src="http://link-to-image" title="Image title" alt="<?php the_title(); ?>"/>

Answer 3

What code does your theme use to show the featured image (aka post-thumbnail)? Most themes do it like this:

<?php the_post_thumbnail(); ?>

or like this (the right way to do it):

<?php 
    if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
        the_post_thumbnail();
    } 
?>

In that case, replace the code with this:

<?php 
    if ( has_post_thumbnail() ) { // check if the post has a Post Thumbnail assigned to it.
        the_post_thumbnail(
            array(
                'alt' => trim( strip_tags( $attachment->post_title ) ),
            );
        );
    } 
?>

...where, 'alt' => trim( strip_tags( $attachment->post_title ) ) tells the the_post_thumbnail function that it should use the post's title instead of image's alt text.

READ: WordPress Codex — Function Reference for the_post_thumbnail