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  1. <?php
  2. error_reporting(-1);
  3. mb_internal_encoding('utf-8');
  4. //проверка на палиндром
  5.  
  6. $text = "12133454321";
  7. $text = mb_strtolower($text);
  8. $text = str_replace(' ', '', $text);
  9.  
  10. $length = floor(mb_strlen($text)/2);
  11.  
  12. $answer = 'палиндром';
  13.  
  14. for ($i=0; $i<$length; $i++) {
  15. 	echo "итерация $i\n";
  16. 	$s = mb_substr($text, $i, 1);
  17. 	$f = mb_substr($text, -$i-1, 1);
  18. 	echo "$s - $f\n";
  19. 	if ($s != $f) {
  20. 		$answer = 'непалиндром';
  21. 		break;
  22. 	}
  23. }
  24.  
  25. echo $answer;
Success #stdin #stdout 0.02s 24448KB
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stdin
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Standard input is empty
stdout
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итерация 0
1 - 1
итерация 1
2 - 2
итерация 2
1 - 3
непалиндром
https://ideone.com/uBrPBQ
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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