An error is always reported When PHP code is embedded in the Smarty template. how can this problem be solved?

The PHP code embedded in the Smarty template always reports an error. I want to teach you the Smarty experts. I directly embed the PHP code in the Smarty template. When an error is reported, I also set $ php_handling to promised, urgent, and urgent, hope you can give me some advice! & Nbsp;, {php} echo & nbsp; $ a; {/php} or the PHP code embedded in the Smarty template always reports an error
I want to teach you how to use Smarty. I directly embed PHP code in Smarty. I also set $ php_handling as promised when I reported an error. it's urgent and urgent. hope you can give me some advice!
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{Php}
Echo $;
{/Php}

Or

Echo $;
?>

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Using smarty3 to directly support PHP functions
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Error message
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The reply was deleted by the moderator at 10:59:12, January 16 ,.