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Server-Side Scripting/Introduction/PHP

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index.php

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<?php

// Displays 'Hello world!'
//
// References:
//  https://repl.it/languages/php7
//  https://www.php.net/manual/en/tutorial.firstpage.php

echo 'Hello world!';

?>

Try It

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Copy and paste the code above into the following free online development environment or use your own PHP compiler / interpreter / IDE.