驗證'價格'（雙）表單輸入PHP

Question

嗨，我想驗證用戶輸入的表單使用PHP。 我已經設法驗證文本，數字和年份輸入，但無法獲得工作價格。

我在我的代碼的頂部創建誤差變量：

$titleErr = ""; $developerErr = ""; $releaseErr = ""; $stockErr = ""; $priceErr = ""; 

我然後驗證輸入並分配消息發送到所述可變如果需要的話：

if (!preg_match("/^[a-zA-Z ]*$/",$title)) { 
        $titleErr = "Invalid input, only letters and white space allowed."; 
       } else if (!preg_match("/^[a-zA-Z ]*$/",$developer)){ 
        $developerErr = "Invalid input, only letters and white space allowed."; 
       } else if ($release<1990 || $release>2020){ 
        $releaseErr = "Invalid input, enter a year between 1990 & 2020."; 
       } else if (!is_numeric($stock)){ 
        $stockErr = "Invalid input, only numbers allowed."; 
       } else if (!is_float($price)){ 
        $priceErr = "Invalid input, only doubles allowed."; 
       } 

前4個語句驗證完美輸入。然而，最後一個檢查輸入是否爲浮點數（價格例如10.99）似乎會在輸入正確的輸入時返回錯誤消息。

這是我的形式：

<form class ="form-horizontal" role="form" id="add" name="add" action="?" method="post">   
      <div class="form-group"> 
       <label class="control-label col-sm-2">Title</label> <div class="col-sm-10"><input class="form-control" id="addFormTitle" name="title" type="text"> <span class="error"><?php echo $titleErr;?></span></div> 
      </div> 
      <div class="form-group"> 
       <label class="control-label col-sm-2">Developer</label> <div class="col-sm-10"><input class="form-control" id="addFormDeveloper" name="developer" type="text"> <span class="error"><?php echo $developerErr;?></span></div> 
      </div> 
      <div class="form-group"> 
       <label class="control-label col-sm-2">Release (Year Format/YYYY)</label> <div class="col-sm-10"><input class="form-control" id="addFormRelease" name="release" type="text"> <span class="error"><?php echo $releaseErr;?></span></div> 
      </div> 
      <div class="form-group"> 
       <label class="control-label col-sm-2">Stock</label> <div class="col-sm-10"><input class="form-control" id="addFormStock" name="stock" type="text"> <span class="error"><?php echo $stockErr;?></span></div> 
      </div> 
      <div class="form-group"> 
       <label class="control-label col-sm-2">Price (&#163)</label> <div class="col-sm-10"><input class="form-control" id="addFormPrice" name="price" type="text"> <span class="error"><?php echo $priceErr;?></span></div> 
      </div> 
      <div class="form-group"> 
       <div class="col-sm-offset-2 col-sm-10"> 
        <button type="submit" class="btn btn-default" name="addSubmit" value="Add product">Submit</button> 
       </div> 
      </div> 
     </form> 

Answer 1

可以使用floatval函數獲取變量的浮點值，然後檢查它是否是一個浮點值，或者沒有，像這樣：

if(is_float(floatval($price))){ 
    echo "float value"; 
}else{ 
    echo "not a float value"; 
} 

編輯：

在你的代碼中，你可以做這樣的事情：

if (!preg_match("/^[a-zA-Z ]*$/",$title)) { 
    $titleErr = "Invalid input, only letters and white space allowed."; 
} else if (!preg_match("/^[a-zA-Z ]*$/",$developer)){ 
    $developerErr = "Invalid input, only letters and white space allowed."; 
} else if ($release<1990 || $release>2020){ 
    $releaseErr = "Invalid input, enter a year between 1990 & 2020."; 
} else if (!is_numeric($stock)){ 
    $stockErr = "Invalid input, only numbers allowed."; 
} else if (!is_float(floatval($price))){ 
    $priceErr = "Invalid input, only doubles allowed."; 
}