How to create shortcode with php

// function that runs when shortcode is called
function wpb_demo_shortcode() { 
 
// Things that you want to do. 
$message = 'Hello world!'; 
 
// Output needs to be return
return $message;
} 
// register shortcode
add_shortcode('greeting', 'wpb_demo_shortcode');

Source: wpbeginner.com

with variable

$childrens = do_shortcode( '[products ids="'. $string . '"]' );

Source: wordpress.org

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