PHP Arrays and $_POST acting strange -

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i have following html:

<input type="checkbox" name="plusfri[]" value="fri"> friday  <input type="checkbox" name="plussat[]" value="sat"> saturday  <input type="checkbox" name="plussun[]" value="sun"> sunday <input type="checkbox" name="plusmon[]" value="mon"> monday

that posts following php:

$plus = array(array("name" => "", "days" => "", "age" => "","conc" => ""));      foreach($_post['plusname'] $k => $p)     {         $plus[$k]['name'] = $p;         $plus[$k]['age'] = $_post['plusage'][$k];         $plus[$k]['conc'] = $_post['plusconc'][$k];         $plus[$k]['days'] = "x";         if($_post['plusfri'][$k]=="fri") $plus[$k]['days'] .= "1";          if($_post['plussat'][$k]=="sat") $plus[$k]['days'] .= "2";          if($_post['plussun'][$k]=="sun") $plus[$k]['days'] .= "3";          if($_post['plusmon'][$k]=="mon") $plus[$k]['days'] .= "4";      }

and end with:

array(3) {   [0]=>   array(4) {     ["name"]=>     string(6) "frisat"     ["days"]=>     string(3) "x12"     ["age"]=>     string(1) "1"     ["conc"]=>     string(0) ""   }   [1]=>   array(4) {     ["name"]=>     string(6) "satsun"     ["age"]=>     string(1) "1"     ["conc"]=>     string(0) ""     ["days"]=>     string(3) "x23"   }   [2]=>   array(4) {     ["name"]=>     string(6) "sunmon"     ["age"]=>     string(1) "1"     ["conc"]=>     string(0) ""     ["days"]=>     string(3) "x34"   } }

can tell me why 'days' has jumped end on elements [1] , [2] ??>

it because of loop. same key order, should set value in same order too, : 

$plus = array(array("name" => "", "days" => "", "age" => "","conc" => ""));  foreach($_post['plusname'] $k => $p) {     $plus[$k]['name'] = $p;     $plus[$k]['days'] = "x"; // <-- see ?     $plus[$k]['age'] = $_post['plusage'][$k];     $plus[$k]['conc'] = $_post['plusconc'][$k];     if($_post['plusfri'][$k]=="fri") $plus[$k]['days'] .= "1";      if($_post['plussat'][$k]=="sat") $plus[$k]['days'] .= "2";      if($_post['plussun'][$k]=="sun") $plus[$k]['days'] .= "3";      if($_post['plusmon'][$k]=="mon") $plus[$k]['days'] .= "4";  }

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