Question

我有以下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

发布到以下PHP：

$plus = array(array("Name" => "", "Days" => "", "Age" => "","Conc" => ""));

    foreach($_POST['plusname'] as $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"; 
    }

我最终得到了：

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"
  }
}

有谁能告诉我为什么'Days'只在元素[1]和[2]上跳到了最后？＆gt;

Answer 1

这是因为你的循环。要获得相同的键顺序，您应该以相同的顺序设置值，如下所示：

$plus = array(array("Name" => "", "Days" => "", "Age" => "","Conc" => ""));

foreach($_POST['plusname'] as $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"; 
}

Answer 2

因为您在循环外声明了$plus[0]的顺序，所以当您运行第一个循环迭代时，您将替换$plus[0]中变量的值赋值。在后续迭代中，因为您尚未预先声明$plus[1]，$plus[2]等，所以您将全新的变量分配给 empty 数组。

如果您想保留订购，请尝试此操作：

$plus = array();

foreach($_POST['plusname'] as $k => $p)
{
    $plusChild = array("Name" => "", "Days" => "", "Age" => "","Conc" => "");
    $plusChild['Name'] = $p;
    $plusChild['Age'] = $_POST['plusage'][$k];
    $plusChild['Conc'] = $_POST['plusconc'][$k];
    $plusChild['Days'] = "X";
    if($_POST['plusfri'][$k]=="Fri") $plusChild['Days'] .= "1"; 
    if($_POST['plussat'][$k]=="Sat") $plusChild['Days'] .= "2"; 
    if($_POST['plussun'][$k]=="Sun") $plusChild['Days'] .= "3"; 
    if($_POST['plusmon'][$k]=="Mon") $plusChild['Days'] .= "4"; 
    $plus[$k] = $plusChild;
}

或者，您可以替换它：

$plus = array(array("Name" => "", "Days" => "", "Age" => "","Conc" => ""));

有了这个：

$plus = array(array("Name" => "", "Days" => "", "Age" => "","Conc" => ""),array("Name" => "", "Days" => "", "Age" => "","Conc" => ""),array("Name" => "", "Days" => "", "Age" => "","Conc" => ""));

但只有当你知道你总会有三次回报时，这才有效。

PHP数组和$ _POST表现奇怪

2 个答案: