Using $_POST to get select option value from HTML

问题:

I use select as below:

<select name=\"taskOption\">
    <option>First</option>
    <option>Second</option>
    <option>Third</option>
</select>

How do I get the value from the select option and store it into a variable for future use, in PHP?

回答1:

Use this way:

$selectOption = $_POST[\'taskOption\'];

But it is always better to give values to your <option> tags.

<select name=\"taskOption\">
  <option value=\"1\">First</option>
  <option value=\"2\">Second</option>
  <option value=\"3\">Third</option>
</select>

回答2:

You can access values in the $_POST array by their key. $_POST is an associative array, so to access taskOption you would use $_POST[\'taskOption\'];.

Make sure to check if it exists in the $_POST array before proceeding though.

<form method=\"post\" action=\"process.php\">
  <select name=\"taskOption\">
    <option value=\"first\">First</option>
    <option value=\"second\">Second</option>
    <option value=\"third\">Third</option>
  </select>
  <input type=\"submit\" value=\"Submit the form\"/>
</form>

process.php

<?php
   $option = isset($_POST[\'taskOption\']) ? $_POST[\'taskOption\'] : false;
   if ($option) {
      echo htmlentities($_POST[\'taskOption\'], ENT_QUOTES, \"UTF-8\");
   } else {
     echo \"task option is required\";
     exit; 
   }

回答3:

<select name=\"taskOption\">
      <option value=\"first\">First</option>
      <option value=\"second\">Second</option>
      <option value=\"third\">Third</option>
</select>

$var = $_POST[\'taskOption\'];

回答4:

You can do it like this, too:

<?php
if(isset($_POST[\'select1\'])){
    $select1 = $_POST[\'select1\'];
    switch ($select1) {
        case \'value1\':
            echo \'this is value1<br/>\';
            break;
        case \'value2\':
            echo \'value2<br/>\';
            break;
        default:
            # code...
            break;
    }
}
?>


<form action=\"\" method=\"post\">
    <select name=\"select1\">
        <option value=\"value1\">Value 1</option>
        <option value=\"value2\">Value 2</option>
    </select>
    <input type=\"submit\" name=\"submit\" value=\"Go\"/>
</form>

回答5:

Like this:

<?php
  $option = $_POST[\'taskOption\'];
?>

The index of the $_POST array is always based on the value of the name attribute of any HTML input.

回答6:

Depends on if the form that the select is contained in has the method set to \"get\" or \"post\".

If <form method=\"get\"> then the value of the select will be located in the super global array $_GET[\'taskOption\'].

If <form method=\"post\"> then the value of the select will be located in the super global array $_POST[\'taskOption\'].

To store it into a variable you would:

$option = $_POST[\'taskOption\']

A good place for more information would be the PHP manual: http://php.net/manual/en/tutorial.forms.php

回答7:

<select name=\"taskOption\">
<option value=\"1\">First</option>
<option value=\"2\">Second</option>
<option value=\"3\">Third</option>
</select>

try this

<?php 
if(isset($_POST[\'button_name\'])){
$var = $_POST[\'taskOption\']
if($var == \"1\"){
echo\"your data here\";
}
}?>

回答8:

-- html file --

<select name=\'city[]\'> 
                <option name=\'Kabul\' value=\"Kabul\" > Kabul </option>
                <option name=\'Herat\' value=\'Herat\' selected=\"selected\">             Herat </option>
                <option name=\'Mazar\' value=\'Mazar\'>Mazar </option>
</select>

-- php file --

$city = (isset($_POST[\'city\']) ? $_POST[\'city\']: null);
print(\"city is: \".$city[0]);