提交POST表单后PHP会保留复选框

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如何在提交表单后检查复选框？我尝试使用这种方法：提交POST表单后PHP会保留复选框

<input type = "checkbox" name="math[]" value="Addition" <?php if(isset($_POST['math'])) echo "checked='checked'";?>/>Addition<br>

，但我所有的复选框会继续检查，即使我只能选择一个，这里是我的代码：

<form id="calc" action="calculator.php" method="POST" > 
<b>Enter First No: <br>  
<input type = "text" name="num1" value="<?php if(isset($_POST['num1'])){echo $num1;} ?>" required="required"/><br> 
Enter Second No: <br> 
<input type = "text" name="num2" value="<?php if(isset($_POST['num2'])){echo $num2;} ?>" required="required"/><br> 
<b>Select Operation: <br> 
<input type = "checkbox" name="math[]" value="Addition" <?php if(isset($_POST['math'])) echo "checked='checked'";?>/>Addition<br> 
<input type = "checkbox" name="math[]" value="Subtraction" <?php if(isset($_POST['math'])) echo "checked='checked'";?>/>Subtraction<br> 
<input type ="submit" value="compute" name="btnsubmit"> <br>

谢谢！

来源

2017-08-26 Robert Kevin Sieras

请编辑您的帖子，并把您的HTML html或代码块 –

我很抱歉，我忘了把它放在支架上， ,,, Im新到这 –

可能重复[获取$ \ _ POST来自多个复选框]（https://stackoverflow.com/questions/4997252/get-post-from-multiple-checkboxes） –

变化：

<form id="calc" action="calculator.php" method="POST" > 
<b>Enter First No: <br>  
<input type = "text" name="num1" value="<?php if(isset($_POST['num1'])){echo $num1;} ?>" required="required"/><br> 
Enter Second No: <br> 
<input type = "text" name="num2" value="<?php if(isset($_POST['num2'])){echo $num2;} ?>" required="required"/><br> 
<b>Select Operation: <br> 
<input type = "checkbox" name="math[]" value="Addition" <?php if(isset($_POST['math'])) echo "checked='checked'";?>/>Addition<br> 
<input type = "checkbox" name="math[]" value="Subtraction" <?php if(isset($_POST['math'])) echo "checked='checked'";?>/>Subtraction<br> 
<input type ="submit" value="compute" name="btnsubmit"> <br>

要：

<form id="calc" action="" method="POST" > 
<b>Enter First No: <br>  
<input type = "text" name="num1" value="<?php if(isset($_POST['num1'])){echo $_POST['num1'];} ?>" required="required"/><br> 
Enter Second No: <br> 
<input type = "text" name="num2" value="<?php if(isset($_POST['num2'])){echo $_POST['num2'];} ?>" required="required"/><br> 
<b>Select Operation: <br> 
<input type = "checkbox" name="math[]" value="Addition" 
    <?php if(isset($_POST['math'][0])) 
    { 
    if($_POST['math'][0]=="Addition"){ echo 'checked="checked"';} 
    } ?> />Addition<br> 
<input type = "checkbox" name="math[]" value="Subtraction" 
    <?php if(isset($_POST['math'][0]) || isset($_POST['math'][1])) 
    { 
    if($_POST['math'][0]=="Subtraction"){ echo 'checked="checked"';} 
    if(isset($_POST['math'][1])){ 
     if($_POST['math'][1]=="Subtraction"){ 
     echo 'checked="checked"'; 
     } 
    } 
    } ?> />Subtraction<br> 

<input type ="submit" value="compute" name="btnsubmit"> <br>

来源

2017-08-26 06:03:09

我已经试过，它不工作 –

现在看我编辑的代码上面 –

这可能工作..荣誉 –

提交POST表单后PHP会保留复选框

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