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  1. <?php
  2.  
  3. $array  = [ 1, 2, 6.1, 6.2, 6.3, 6.4, 6.5, 7, 8 ];
  4. $result = [ ];
  5. for( $i = 0, $size = count( $array ); $i < $size; $i ++ ) {
  6. 	$start = $array[ $i ];
  7. 	$end   = $start;
  8. 	while( isset( $array[ $i + 1 ] ) && ! bccomp( $array[ $i + 1 ] - $array[ $i ], 0.1, 1 ) ) {
  9. 		$end = $array[ ++ $i ];
  10. 	}
  11. 	$result[] = $start == $end ? $start : $start . '-' . $end;
  12. }
  13. print_r( $result );
Success #stdin #stdout 0.02s 24400KB
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stdin
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Standard input is empty
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Array
(
    [0] => 1
    [1] => 2
    [2] => 6.1-6.5
    [3] => 7
    [4] => 8
)
https://ideone.com/fNVwXm
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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