Php does not need form post data

How does php post data without a form? Define 1.php, 2. php page, when 1. when processing the php page, process the next segment of data and jump to 2. php page, I also want to pass some data to 2. php page, because the get method section data is displayed in the address bar in plain text, so you want to pass through post, but post is generally used in the form, how can I post data without using a form in php?
Define 1.php, 2. php page, when 1. when processing the php page, process the next segment of data and jump to 2. php page, I also want to pass some data to 2. php page, because the get method segment data is clearly displayed in the address bar, so I want to pass through post, but post is generally used in the form. how can I transfer the data to 2. php is not visible to users (except curl and socket );

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Curl