gistfile1.php

<?php
class Foo
{
    public function Foo()
    {
        var_dump(__METHOD__);
    }
    public function __construct()
    {
        var_dump(__METHOD__);
    }
}
error_reporting(E_ALL|E_STRICT);
$foo = new Foo();

//Strict standards: Redefining already defined constructor for class Foo in /tmp/foo.php on line 9

//string(16) "Foo::__construct"

gistfile2.php

<?php
class Foo
{
    public function __construct()
    {
        var_dump(__METHOD__);
    }
    public function Foo()
    {
        var_dump(__METHOD__);
    }

}
error_reporting(E_ALL|E_STRICT);
$foo = new Foo();

//string(16) "Foo::__construct"

gistfile3.php

<?php
namespace Foo;
class Foo
{
    public function Foo()
    {
        var_dump(__METHOD__);
    }
    public function __construct()
    {
        var_dump(__METHOD__);
    }
}
error_reporting(E_ALL|E_STRICT);
$foo = new Foo();

//string(20) "Foo\Foo::__construct"