How to use post array in php

PHP is a widely used server-side scripting language that can be used to develop web applications. In PHP, users can use the post array as an associative array to receive data transmitted through HTTP POST requests. This array can contain all POST data transferred from a front-end form (such as an HTML form). In this article, we will delve into the use of POST arrays and introduce how to use it in PHP to accept data submitted by web forms.

Generally speaking, when a user submits a form, the data in the form can be transmitted through the POST method of the HTTP request. Of course, transmission can also be done through the GET method, but the POST method is safer and more commonly used. After the form is submitted via the POST method, the POST array will hold the data from the form.

Accessing POST arrays in PHP is very simple. First, you need to use the superglobal variable $_POST, which contains all POST request variables (that is, the data in the form). If there is only one input box in your form, for example:

<form method="POST" action="process.php">
  <input type="text" name="input_text">
  <button type="submit" value="Submit">Submit</button>
</form>

Then in PHP, you can use the $_POST array to get the data transmitted by the user:

<?php
$input_text_value = $_POST[&#39;input_text&#39;];
echo &#39;用户输入的文本内容为：&#39;.$input_text_value;
?>

In In the above PHP code, when the user submits the form, it will be transferred to a page called process.php. In process.php, the $_POST array will contain the transferred data from the form. Among them, the name of the input box is input_text, and we can use this name to obtain the text content entered by the user. In this case, the $input_text_value variable will contain the value of the input_text boolean in the $_POST array, which is the text content entered by the user.

Of course, the POST array can contain many key-value pairs, and each key-value pair represents a form control. For example, here is a form that contains different types of form controls:

<form method="POST" action="process.php">
  <label>用户名：</label>
  <input type="text" name="username"><br>

  <label>密码：</label>
  <input type="password" name="password"><br>

  <label>性别：</label>
  <input type="radio" name="gender" value="男">男
  <input type="radio" name="gender" value="女">女<br>

  <label>年龄：</label>
  <select name="age">
    <option value="18">18</option>
    <option value="19">19</option>
    <option value="20">20</option>
  </select><br>

  <label>国家：</label>
  <input type="checkbox" name="country[]" value="中国">中国
  <input type="checkbox" name="country[]" value="美国">美国
  <input type="checkbox" name="country[]" value="日本">日本<br>

  <button type="submit" value="提交">提交</button>
</form>

In PHP, when displaying this type of form, you can use the following code to parse the POST array:

<?php
$username_value = $_POST['username'];
$password_value = $_POST['password'];
$gender_value = $_POST['gender'];
$age_value = $_POST['age'];
$countries_values = $_POST['country'];

echo '用户名： '.$username_value.'<br>';
echo '密码： '.$password_value.'<br>';
echo '性别： '.$gender_value.'<br>';
echo '年龄： '.$age_value.'<br>';

echo '选中的国家：';
foreach($countries_values as $country){
  echo $country.' ';
}
?>

If you need to get more key-value pairs from the $_POST array, this code can help you achieve it. For example, in this form, we have the following types of form controls:

• Input box- username and password
• Radio button- gender
• drop-down menu- age
• Multiple select box - country

Using the above code, we can easily receive all the data in the form through POST array. In this simple example, the POST array will contain all the fields in the form, and the POST array in PHP has been used in a simple and understandable way, which can provide a lot of help to developers developing web applications.

The above is the detailed content of How to use post array in php. For more information, please follow other related articles on the PHP Chinese website!