Questions about the ARRAY_DIFF_UASSOC

Source:

  
    $b)? 1:-1;  }  $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");  $array2 = array("a" => "green", "yellow", "red");  $result = array_diff_uassoc($array1, $array2, "key_compare_func");  print_r($result);

Results:

string(1) "b"string(1) "a"=====1string(1) "b"string(1) "c"=====2int(0)string(1) "b"=====3string(1) "a"int(0)=====4int(0)string(1) "a"=====5int(1)int(0)=====6string(1) "a"int(0)=====7string(1) "a"string(1) "a"=====8int(0)string(1) "a"=====8int(0)int(0)=====9string(1) "b"string(1) "a"=====9string(1) "b"int(0)=====10string(1) "b"int(1)=====11string(1) "c"string(1) "a"=====12string(1) "c"int(0)=====13string(1) "c"int(1)=====14Array(    [b] => brown    [c] => blue    [0] => red)

Excuse me:

对于这个函数，他的比较原理是什么？为什么要进行14次比较？

Reply content:

Source:

  
    $b)? 1:-1;  }  $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");  $array2 = array("a" => "green", "yellow", "red");  $result = array_diff_uassoc($array1, $array2, "key_compare_func");  print_r($result);

Results:

string(1) "b"string(1) "a"=====1string(1) "b"string(1) "c"=====2int(0)string(1) "b"=====3string(1) "a"int(0)=====4int(0)string(1) "a"=====5int(1)int(0)=====6string(1) "a"int(0)=====7string(1) "a"string(1) "a"=====8int(0)string(1) "a"=====8int(0)int(0)=====9string(1) "b"string(1) "a"=====9string(1) "b"int(0)=====10string(1) "b"int(1)=====11string(1) "c"string(1) "a"=====12string(1) "c"int(0)=====13string(1) "c"int(1)=====14Array(    [b] => brown    [c] => blue    [0] => red)

Excuse me:

对于这个函数，他的比较原理是什么？为什么要进行14次比较？

Check the source code, before the comparison, PHP also carried out a sort operation, sorting will also take the callback function, which is what you will see in the results b and c the two appear in the same array of keys to compare the records.

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