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I'm trying to display a custom field called 'my_custom_field' inside the loop:

$custom_array = get_post_custom( get_the_ID() );                    
echo $custom_array['my_custom_field'];

This code display "array". Should it not display the value of the custom field instead?

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up vote 3 down vote accepted

get_post_custom() will return an array of arrays. You need:

echo $custom_array['my_custom_field'][0];

Alternatively, you can use get_post_meta() with the $single flag as true:

echo get_post_meta( get_the_ID(), 'my_custom_field', true );
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