Need to turn this php into WP shortcode

Init your shortcode

add_shortcode('shortcode_ald_crp', 'myshortcode_echo_ald_crp');

The function what you want:

function myshortcode_echo_ald_crp() {
    ob_start(); 
    if ( function_exists( 'echo_ald_crp' ) ) echo_ald_crp();
    return ob_get_clean();
}

you call you shortcode in a post like this:

[shortcode_ald_crp]

Or into the php code:

echo do_shortcode('[shortcode_ald_crp]');

UPDATE

Change the function add_shortcode

shortcode_ald_crp for myshortcode_echo_ald_crp