Description:
------------
The return value of debug_backtrace() was changed since php7.


Test script:
---------------
$ cat Proxy.php 
<?php
class Proxy
{
  public static function __callStatic($function, array $arguments)
  {
    if (self::checkCalledMethod($function))
    {
    }
  }
  
  public static function checkCalledMethod($function)
  {
    $trace = debug_backtrace();
    var_dump($trace);
  }
}
----- ----- ----- -----
$ cat Test.php 
<?php
class Test
{
  public function run()
  {
    Proxy::bar();
  }
}
----- ----- ----- -----
$ cat app.php 
<?php
require './Test.php';
require './Proxy.php';

$test = new Test();
$test->run();
----- ----- ----- -----
$ php app.php


Expected result:
----------------
PHP 5.6.10-dev

array(4) {
  [0]=>
  array(6) {
    ["file"]=>
    string(34) "/vagrant/debug_backtrace/Proxy.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(17) "checkCalledMethod"
    ["class"]=>
    string(5) "Proxy"
    ["type"]=>
    string(2) "::"
    ["args"]=>
    array(1) {
      [0]=>
      &string(3) "bar"
    }
  }
  [1]=>
  array(6) {
    ["file"]=>
    string(33) "/vagrant/debug_backtrace/Test.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(12) "__callStatic"
    ["class"]=>
    string(5) "Proxy"
    ["type"]=>
    string(2) "::"
    ["args"]=>
    array(2) {
      [0]=>
      &string(3) "bar"
      [1]=>
      &array(0) {
      }
    }
  }
  [2]=>
  array(6) {
    ["file"]=>
    string(33) "/vagrant/debug_backtrace/Test.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(3) "bar"
    ["class"]=>
    string(5) "Proxy"
    ["type"]=>
    string(2) "::"
    ["args"]=>
    array(0) {
    }
  }
  [3]=>
  array(7) {
    ["file"]=>
    string(32) "/vagrant/debug_backtrace/app.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(3) "run"
    ["class"]=>
    string(4) "Test"
    ["object"]=>
    object(Test)#1 (0) {
    }
    ["type"]=>
    string(2) "->"
    ["args"]=>
    array(0) {
    }
  }
}


Actual result:
--------------
PHP 7.0.0-dev

array(3) {
  [0]=>
  array(6) {
    ["file"]=>
    string(34) "/vagrant/debug_backtrace/Proxy.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(17) "checkCalledMethod"
    ["class"]=>
    string(5) "Proxy"
    ["type"]=>
    string(2) "::"
    ["args"]=>
    array(1) {
      [0]=>
      string(3) "bar"
    }
  }
  [1]=>
  array(6) {
    ["file"]=>
    string(33) "/vagrant/debug_backtrace/Test.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(12) "__callStatic"
    ["class"]=>
    string(5) "Proxy"
    ["type"]=>
    string(2) "::"
    ["args"]=>
    array(2) {
      [0]=>
      string(3) "bar"
      [1]=>
      array(0) {
      }
    }
  }
  [2]=>
  array(7) {
    ["file"]=>
    string(32) "/vagrant/debug_backtrace/app.php"
    ["line"]=>
    int(7)
    ["function"]=>
    string(3) "run"
    ["class"]=>
    string(4) "Test"
    ["object"]=>
    object(Test)#1 (0) {
    }
    ["type"]=>
    string(2) "->"
    ["args"]=>
    array(0) {
    }
  }
}