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PHP array merging: Analysis of the differences between + operator, array_merge, and array_merge_recursive

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WBOYOriginal
2016-07-25 08:58:531372browse
  2. $a = array(
  3. 'a',
  4. );
  5. $b = array(
  6. 'u',
  7. );
  8. $c = $a + $b;
  9. var_dump($c);
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Output:

  2. $a = array(
  3. 66=>'a',
  4. );
  5. $b = array(
  6. 60=>'u',
  7. 66=>'c'
  8. );
  9. $c = $a + $b;
  10. var_dump($c);
Copy code

Output:

  2. $a = array(
  3. 1=>'a',
  4. 2=>'b',
  5. 'c'=>'c',
  6. 'd'= >'d',
  7. );
  8. $b = array(
  9. 1=>'u',
  10. 3=>'v',
  11. 'c'=>'w',
  12. 'd'=> ;'x',
  13. 'y'=>'y',
  14. 60=>'z',
  15. );
  16. $c = $a + $b;
  17. var_dump($c);
  18. ?>
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Output:

  2. $a = array(
  3. 'a',
  4. );
  5. $b = array(
  6. 'u',
  7. );
  8. $c = array_merge($a, $b);
  9. var_dump($ c);
Copy code

Output:

  2. $a = array(
  3. 66=>'a',
  4. );
  5. $b = array(
  6. 60=>'u',
  7. 66=>'c'
  8. );
  9. $c = array_merge($a, $b);
  10. var_dump($c);
Copy code

Output:

  2. $a = array(
  3. 1=>'a',
  4. 2=>'b',
  5. 'c'=>'c',
  6. 'd'=>'d' ,
  7. );
  8. $b = array(
  9. 1=>'u',
  10. 3=>'v',
  11. 'c'=>'w',
  12. 'd'=>'x',
  13. 'y'=>'y',
  14. 60=>'z',
  15. );
  16. $c = array_merge($a, $b);
  17. var_dump($c);
Copy code

Output:

  2. $a = array(
  3. 'a',
  4. );
  5. $b = array(
  6. 'u',
  7. );
  8. $c = array_merge_recursive($a, $b);
  9. var_dump($ c);
Copy code

Output:

  2. $a = array(
  3. 'a',
  4. );
  5. $b = array(
  6. 'u',
  7. );
  8. $c = array_merge_recursive($a, $b);
  9. var_dump($ c);
Copy code

Output:

  2. $a = array(
  3. 1=>'a',
  4. 2=>'b',
  5. 'c'=>'c',
  6. 'd'=>'d' ,
  7. );
  8. $b = array(
  9. 1=>'u',
  10. 3=>'v',
  11. 'c'=>'w',
  12. 'd'=>'x',
  13. 'y'=>'y',
  14. 60=>'z',
  15. );
  16. $c = array_merge_recursive($a, $b);
  17. var_dump($c);
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Output:

array(8) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> array(2) { [0]=> string(1) "c" [1]=> string(1) "w" } ["d"]=> array(2) { [0]=> string(1) "d" [1]=> string(1) "x" } [2]=> string(1) "u" [3]=> string(1) "v" ["y"]=> string(1) "y" [4]=> string(1) "z" }


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