Run method chain from a string value - php

Question

I have a question about getting value from running a method from a string. While I am able to handle a single method call from a string I am curious how to call a chain of methods from a string.
For example. $project is an Object.
$method1 = "name";
$project->$method1; // It shows the valid results
$method2 = "get()->first()->name";
$project->get()->first()-name; // It shows the valid results
$project->$method2; // get a null result
Please help to find a way to make the $method2 work. And what happen if I have params inside those methods?
The reason here is I have made an array of customized methods. It can be run line by line, but I am thinking of a way to turn them into a loop, so it's more efficient. Put the methods in to a file then get values by looping to them.
Array = ["getvalue1()", "getvalue2()",...."getValuen()->anotherMethod()->value"]
Thanks,

Answer 1

If you want nested try something like this:
private function callMethodChain($model, $methodChain)
{
return array_reduce(explode('->', $methodChain), function($model, $method) {
return $model->$method;
}, $model);
}
This will go through a chain of method calls as your described. If some of the chain (the last piece) is a property I think I once rigged up the following to handle it:
protected function callMethodChain($model, $methodChain)
{
return array_reduce(explode('->', $methodChain), function($model, $method) {
try {
return $model->$method;
} catch (Exception $e) {
return $model->$method();
}
}, $model);
}
If you want to add params try replacing $model->method with:
call_user_func_array(
array($project, 'your_method'),
$params
);

Answer 2

Try this approach:
$method1 = 'name';
$project->{$method1}();

Answer 3

Run method from a string value
Use call_user_func() and call_user_func_array().
call_user_func_array() suits good if you are passing parameters
call_user_func_array(
array($project, 'your_method'),
$params
);
Chain function
function chain_fun($chain,$object)
{
return array_reduce(explode('->', $chain), function ($obj, $method) {
if(preg_match('/[()]/',$method)){
$method=trim($method,'()');
return $obj->$method();
}
return $obj->$method;
}, $object);
}
Here is test
akshay#db-3325:/tmp$ cat test.php
<?php
class Testclass
{
private $str;
function __construct()
{
$this->str = new StdClass;
}
function addA()
{
$this->str->a='A';
return $this;
}
function addB()
{
$this->str->b='B';
return $this;
}
function get()
{
return $this->str;
}
}
function chain_fun($chain,$object)
{
return array_reduce(explode('->', $chain), function ($obj, $method) {
if(preg_match('/[()]/',$method)){
$method=trim($method,'()');
return $obj->$method();
}
return $obj->$method;
}, $object);
}
$object = new Testclass();
// Output 1
print_r(chain_fun("addA()->addB()->get()", $object));
// Output 2
echo chain_fun("addA()->addB()->get()->a", $object);
?>
Output
akshay#db-3325:/tmp$ php test.php
stdClass Object
(
[a] => A
[b] => B
)
A