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  1. <?php
  2.  
  3. // your code goes here
  4. $arr = [
  5.     [0, 1, 0, 1, 0],
  6.     [1, 0, 1, 1, 1],
  7.     [0, 1, 0, 1, 0],
  8.     [0, 0, 1, 0, 0],
  9. ];
  10.  
  11. //echo '<pre>';
  12. echo "Before:\n\n";
  13. echo implode(
  14. 	"\n",
  15. 	array_map(
  16. 		function ($a) { return implode('', $a); },
  17. 		$arr
  18. 	)
  19. );
  20.  
  21. foreach ($arr as $i => &$a) {
  22.     foreach ($a as $j => $v) {
  23.     	if ($v !== 0) {
  24.     		continue;
  25.     	}
  26.  
  27.         if (!array_key_exists($i-1, $arr) || $arr[$i-1][$j] !== 1) {
  28.         	continue;
  29.         }
  30.  
  31.         if (!array_key_exists($j+1, $a) || $a[$j+1] !== 1) {
  32.             continue;
  33.         }
  34.  
  35.         if (!array_key_exists($i+1, $arr) || $arr[$i+1][$j] !== 1) {
  36.             continue;
  37.         }
  38.  
  39.         if (!array_key_exists($j-1, $a) || $a[$j-1] !== 1) {
  40.             continue;
  41.         }
  42.  
  43.         $arr[$i][$j] = 'X';
  44.     }
  45. }
  46. unset($a);
  47.  
  48. echo
  49. 	"\n\nAfter:\n\n",
  50. 	implode(
  51. 		"\n",
  52. 		array_map(
  53. 			function ($a) { return implode('', $a); },
  54. 			$arr
  55. 		)
  56. 	);
  57.  
Success #stdin #stdout 0.02s 23996KB
comments (?)
stdin
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Standard input is empty
stdout
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Before:

01010
10111
01010
00100

After:

01010
1X111
01X10
00100
https://ideone.com/cbm1Db
language:
PHP (php 7.3.5)
created:
3 years ago
visibility:
public

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