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  1. <?php
  2. switch ($_GET['lang']) {
  3. 	case 'ru':
  4. 		$lang = 'en';
  5. 		break;
  6. 	case 'en':
  7. 		$lang = 'ru';
  8. 		break;
  9. 	default:
  10. 		$lang = 'en';
  11. 		break;}
  12. ?>
  13.  
  14. <!DOCTYPE html>
  15. <html lang="en">
  16. <head>
  17. 	<meta charset="UTF-8">
  18. 	<title>Document</title>
  19. </head>
  20. <body>
  21. 	<a href="/?lang=<?=$lang?>"><?=$lang?></a>
  22. </body>
  23. </html>
Success #stdin #stdout #stderr 0.02s 24400KB
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stdin
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Standard input is empty
stdout
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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<a href="/?lang=en">en</a>
</body>
</html>
stderr
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PHP Notice:  Undefined index: lang in /home/ftvHiY/prog.php on line 2
https://ideone.com/TASKvy
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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