get meta value from database by post id

Use the third parameter of the get_post_meta().
If the third parameter is set to true then the function will return a single result, as a string. If false, or not set, then the function returns an array of the custom fields

for example:–

$froms = get_post_meta( 139, 'from', true );
$tos = get_post_meta( 139, 'to', true );

For more details look into the Codex here

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