Last updated on May 6, 2018
CodeIgniter permits you to override its default routing behavior through the use of the _remap() function. As you already knew the second segment of the URI typically determines with function is in the controller get called and it will be passed as a parameter to the _remap() function. So to hide the real method name in the URL you can use _remap() and you can define your own set of routing rules.
If your controller contains a function named _remap(), it will always get called regardless of what your URI contains. It overrides the normal behavior. For example: your URL is http://localhost/index.php/post/index and you do not want to call index for this then you can use _remap() to map new function view instead of index like this.
public function _remap($method)
{
if ($method == 'index')
{
$this->postList();
}
else
{
show_404();
}
}
public function postList() {
}
Any extra segments after the method name are passed into _remap() as an optional second parameter. This array can be used in combination with PHP’s call_user_func_array() to reproduce the CodeIgniter’s default behavior.
we can process your mappings neatly by avoiding multiple if – else if – else and switch statements, by defining your methods with a prefix(Ex: process) and calling methods dynamically with call_user_func_array() as shown below.
public function _remap($method, $params = array())
{
$method = 'process'.ucwords($method);
if (method_exists($this, $method))
{
return call_user_func_array(array($this, $method), $params);
}
show_404();
}
Resources:
- call_user_func_array(): Call a callback with an array of parameters
- method_exists(): Checks if the class method exists
- ucwords(): Uppercase the first character of each word in a string
- _remap(): override the default behavior of CI’s routing
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