Getting checkbox values on submit

2019-01-01 11:06发布

站内问答 / PHP
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I have 6 options, I want to get the checked values to store them in variable on second page. How do I go on doing that?

<form action="third.php" method="get">
    <!-- Choices -->
    Red     <input type="checkbox" name="color[]" id="color" value="Red">
    Green   <input type="checkbox" name="color[]" id="color" value="Green">
    Blue    <input type="checkbox" name="color[]" id="color" value="Blue">
    Cyan    <input type="checkbox" name="color[]" id="color" value="Cyan">
    Magenta <input type="checkbox" name="color[]" id="color" value="Magenta">
    Yellow  <input type="checkbox" name="color[]" id="color" value="Yellow">
    Black   <input type="checkbox" name="color[]" id="color" value="Black">
    <!-- Submit -->
    <input type="submit" value="submit">
</form>

And third.php page :

$color = $_GET['color'];

echo 'The color is '.$color;

If I remove [], I get the color is on, when I do it like color[] I get a notice saying :

Array to string conversion

What I want is the value of checked, checkboxes so I can store it in variable.

标签： php forms
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10条回答
看风景的人
2楼-- · 2019-01-01 11:13

It's very simple.

The checkbox field is like an input text. If you don't write anything in the field, it will say the field doesn't exist.

<form method="post">
    <input type="checkbox" name="check">This is how it works!<br>
    <button type="submit" name="submit">Submit</button>
</form>
<?php
if(isset($_POST['submit'])) {
    if(!isset($_POST['check'])) {
        echo "Not selected!";
    }else{
        echo "Selected!";
    }
}
?>
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大哥的爱人
3楼-- · 2019-01-01 11:15 
//retrive check box and gender value
$gender=$row['gender'];
$chkhobby=$row['chkhobby'];
<tr>
    <th>GENDER</th>
    <td>
            Male<input type="radio" name="gender" value="1" <?php echo ($gender== '1') ?  "checked" : "" ;  ?>/>
            Female<input type="radio" name="gender" value="0" <?php echo ($gender== '0') ?  "checked" : "" ;  ?>/>

    </td>
</tr>
<tr>
    <th>Hobbies</th>
    <td>
        <pre><?php //print_r($row);

            $hby = @explode(",",$row['chkhobby']);
            //print_r($hby);
        ?></pre>
        read<input id="check_1" type="checkbox" name="chkhobby[]" value="read" <?php if(in_array("read",$hby)){?> checked="checked"<?php }?>>
        write<input id="check_2" type="checkbox" name="chkhobby[]" value="write" <?php if(in_array("write",$hby)){?> checked="checked"<?php }?>>
        play<input id="check_4" type="checkbox" name="chkhobby[]" value="play" <?php if(in_array("play",$hby)){?> checked="checked"<?php }?>>


    </td>
    </tr>
//update
$gender=$_POST['gender'];
$chkhobby = implode(',', $_POST['chkhobby']);
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深知你不懂我心
4楼-- · 2019-01-01 11:20

I think the value for the $_POST['color'] should be read only after checking if its set.

<?php


    if(isset($_POST['color'])) {
      $name = $_POST['color'];  

    echo "You chose the following color(s): <br>";
    foreach ($name as $color){
   echo $color."<br />";
  }} // end brace for if(isset

else {

echo "You did not choose a color.";

}

?>
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十年一品温如言
5楼-- · 2019-01-01 11:22

What i suggest is , its better to use post than get. here are some difference between post VS get

Some notes on GET requests:

  1. GET requests can be cached
  2. GET requests remain in the browser history
  3. GET requests can be bookmarked
  4. GET requests should never be used when dealing with sensitive data
  5. GET requests have length restrictions
  6. GET requests should be used only to retrieve data

Some notes on POST requests:

  1. POST requests are never cached
  2. POST requests do not remain in the browser history
  3. POST requests cannot be bookmarked
  4. POST requests have no restrictions on data length

HTML Code

            <html>
    <head></head>
    <body>
    <form action="output.php" method="post">
    Red<input type="checkbox" name="color[]" id="color" value="red">
    Green<input type="checkbox" name="color[]" id="color" value="green">
    Blue<input type="checkbox" name="color[]" id="color" value="blue">
    Cyan<input type="checkbox" name="color[]" id="color" value="cyan">
    Magenta<input type="checkbox" name="color[]" id="color" value="Magenta">
    Yellow<input type="checkbox" name="color[]" id="color" value="yellow">
    Black<input type="checkbox" name="color[]" id="color" value="black">
    <input type="submit" value="submit">
    </form>
    <body>
    </html>

PHP code

    <?php


    if(isset($_POST['color'])) {
    $name = $_POST['color'];

    echo "You chose the following color(s): <br>";
    foreach ($name as $color){
    echo $color."<br />";
    }} // end brace for if(isset

    else {

    echo "You did not choose a color.";

    }

    ?>
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呛了眼睛熬了心
6楼-- · 2019-01-01 11:24

If you want to turn specific values in to new variables if they have been selected:

// Retrieve array color[] and set as variable    
$colors = $_GET['color'];
// Use array_search to find the key for "red"
$key_red = array_search('red', $colors);
// If "red" exists, the key will be an integer (or FALSE)
if (is_int($key_red)) {
    $red_color = 'Red was selected';
}
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查无此人
7楼-- · 2019-01-01 11:25

foreach is the best way to get array of values.

here the example code: html code:

<form action="send.php" method="post">
    Red<input type="checkbox" name="color[]" id="color" value="red">
    Green<input type="checkbox" name="color[]" id="color" value="green">
    Blue<input type="checkbox" name="color[]" id="color" value="blue">
    Cyan<input type="checkbox" name="color[]" id="color" value="cyan">
    Magenta<input type="checkbox" name="color[]" id="color" value="Magenta">
    Yellow<input type="checkbox" name="color[]" id="color" value="yellow">
    Black<input type="checkbox" name="color[]" id="color" value="black">
    <input type="submit" value="submit">
</form>

phpcode:

<?php

$name = $POST['color'];



foreach ($name as $color){ 
    echo $color."<br />";
}

?>
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