功能的函數錯誤

Question

function Sign1(){ 
    $check = array(
     '23-03-2014' => 'saturday 22 may', 
     '17-05-2014' => 'friday 16 may' 
    ); 
    Dateoption(); 
} 
function Sign2(){ 
    $check = array(
     '10-02-2014' => 'monday 10 feb', 
     '15-02-2014' => 'friday 15 feb', 
     '14-03-2014' => 'friday 14 march' 
    ); 
    Dateoption(); 
} 
function Dateoption(){ 
    $now = time(); 
    $result = array(); 
    foreach($check as $date => $text) { 
     if($now <= strtotime($date)) { 
      $result[] = $text; 
     } 
    } 
    $html = ''; 
    foreach($result as $v) { 
     $html .= '<option>'.$v.'</option>'; 
    } 
    return $html; 
} 
$Content= ' 
<div class="content"> 
    I am signing up for the following date:<br /> 
    <select name="date[0]"> 
     '. Sign1() .' 
    </select> 
    <select> 
     '. Sign2() .' 
    </select> 
</div> 
'; 
echo $Content; 

---

這是爲什麼不工作？這是錯誤的@ foreach（$檢查爲$日期=> $文本）{但我必須改變，讓這項工作。我這樣做所以我只需要鍵入一次函數，而不是複製粘貼到任何地方。

Answer 1

這是關於可變範圍。 Dateoption無法看到$ check變量。 php documentation描述爲：However, within user-defined functions a local function scope is introduced. Any variable used inside a function is by default limited to the local function scope.

您需要將$ check作爲參數傳遞給Dateoption方法。

function Sign1(){ 
    $check = array(
     '23-03-2014' => 'saturday 22 may', 
     '17-05-2014' => 'friday 16 may' 
    ); 
    return Dateoption($check); 
} 
function Sign2(){ 
    $check = array(
     '10-02-2014' => 'monday 10 feb', 
     '15-02-2014' => 'friday 15 feb', 
     '14-03-2014' => 'friday 14 march' 
    ); 
    return Dateoption($check); 
} 
function Dateoption($check){ 
    $now = time(); 
    $result = array(); 
    foreach($check as $date => $text) { 
     if($now <= strtotime($date)) { 
      $result[] = $text; 
     } 
    } 
    $html = ''; 
    foreach($result as $v) { 
     $html .= '<option>'.$v.'</option>'; 
    } 
    return $html; 
} 
$Content= ' 
<div class="content"> 
    I am signing up for the following date:<br /> 
    <select name="date[0]"> 
     '. Sign1() .' 
    </select> 
    <select> 
     '. Sign2() .' 
    </select> 
</div> 
'; 
echo $Content;