PHP code should be secure, structured, normalized, and adaptive _php tutorials

Good PHP code should be structured.
Good PHP code should be normalized.
Good PHP code should be self-adapting.
Good PHP code should be safe.

Where are the advantages and disadvantages of PHP code?

Copy to ClipboardWhat to refer to: [www.bkjia.com]1. Non-optimized PHP code
Echo ("

Search results for query: ".
$_get[' query ']. “.

”);
?>
2. Simple and optimized code
Echo ("

Search results for query: ".
Htmlspecialchars ($_get[' query '). “.

”);
?>
3. Reasonably optimized code
if (isset ($_get[' query '))
{
Echo '

Search results for query: ',
Htmlspecialchars ($_get[' query '], ent_quotes), '.

’;
}
?>

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