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  1. <?php
  2.  
  3. $a = array(
  4. 	'a1' => 1,
  5. 	'b1' => 'a',
  6. 	'a2' => 2,
  7. 	'b2' => 'b',
  8. 	'a3' => 3,
  9. 	'b3' => 'c',
  10. );
  11.  
  12.  
  13. $x = preg_grep('/b[0-9]+/', array_keys($a));
  14. $y = array_intersect_key($a, array_flip($x));
  15.  
  16.  
  17. var_dump($y);
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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array(3) {
  ["b1"]=>
  string(1) "a"
  ["b2"]=>
  string(1) "b"
  ["b3"]=>
  string(1) "c"
}
https://ideone.com/a9AhL6
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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