1. Write short PHP code you want to understand

2. Click on any part of the code 

<?php

$some->first()->second()->third();

3. See Abstract Syntax Tree created by php-parser for full file 

PhpParser\Node\Stmt\Expression(
    expr: PhpParser\Node\Expr\MethodCall(
        var: PhpParser\Node\Expr\MethodCall(
            var: PhpParser\Node\Expr\MethodCall(
                var: PhpParser\Node\Expr\Variable( name: "some" )
                name: PhpParser\Node\Identifier( name: "first" )
                args: []
            )
            name: PhpParser\Node\Identifier( name: "second" )
            args: []
        )
        name: PhpParser\Node\Identifier( name: "third" )
        args: []
    )
)