php - What's wrong with this line? Setting dynamic url background -

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i'm trying dinamically add background inside css using php, using wordpress post image.

background: <?php if(has_post_thumbnail()){                  $img = wp_get_attachment_image_src(get_post_thumbnail_id($post->id), 'destacados');                 echo 'url(".$img['0'].") no-repeat center'  } ?>; 

background: <?php if(has_post_thumbnail()){                  $img = wp_get_attachment_image_src(get_post_thumbnail_id($post->id), 'destacados');                 echo "url('".$img['0']."') no-repeat center";              } ?>;

the quotes wrong , semicolon missing.


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