What are the common CodeIgniter 3 operations in PHP programming?

PHP programming has become a very important skill in today's Internet field, and CodeIgniter 3 is one of the most commonly used frameworks in PHP programming. In CodeIgniter 3, there are some common operations, which this article will introduce.

1. Loading views

In CodeIgniter 3, loading views is a very basic operation. It is very convenient to use CodeIgniter 3 to load views. You only need to use the following code:

$this->load->view('view_name');

where view_name represents the name of the view to be loaded. Views are usually placed in the views folder of the CodeIgniter 3 project.

2. Loading model

The model is a very important component of CodeIgniter 3, which is responsible for interacting with the database. To load a model, just use the following code:

$this->load->model('model_name');

where model_name represents the name of the model to be loaded. Models are usually placed in the models folder of the CodeIgniter 3 project.

3. Assigning variables in the controller

In the controller, we can use the following code to allocate variables:

$data['variable_name'] = 'value';

Where, variable_name represents the variable Name, value is the value of the variable. We can pass this variable into the view like this:

$this->load->view('view_name', $data);

In the view we can use the following code to reference the variable assigned in the controller:

echo $variable_name;

4. Form Validation

CodeIgniter 3 provides a very convenient form validation mechanism that can help us check whether the form input meets the requirements. To use CodeIgniter 3 for form verification, you only need to use the following code:

$this->load->library('form_validation');
$this->form_validation->set_rules('input_name', 'Input Name', 'required');

Among them, input_name represents the name of the form input, and Input Name is the error message displayed when the form verification fails. In the controller, we can use the following code to check whether the form has passed validation:

if ($this->form_validation->run() == FALSE) {
   echo validation_errors();
} else {
   // 执行代码
}

5. Database Operation

Using CodeIgniter 3 for database operations is very convenient. Here are some common database operations:

• Query:

$query = $this->db->query("SELECT * FROM table_name");
$result = $query->result();

• Insert:

$data = array('column_name' => 'value');
$this->db->insert('table_name', $data);

• Update:

$data = array('column_name' => 'new_value');
$this->db->where('id', $id);
$this->db->update('table_name', $data);

• Remove:

$this->db->where('id', $id);
$this->db->delete('table_name');

6. URL Redirect

Using CodeIgniter 3 for URL redirection is very convenient. To redirect to a new URL, just use the following code:

redirect('controller/method');

where controller represents the name of the controller, and method represents the name of the method to be executed.

Summary

CodeIgniter 3 provides a lot of convenient operations. We can use these operations to simplify development work and improve development efficiency when writing PHP programs. When learning CodeIgniter 3, these operations are very basic and need to be mastered to develop better.

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