What is Anchor Text?

It is the visible text that is hyper linked to another page ?

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What does the 301 server response code signify?

Moved Permanently

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how get a list of all pages indexed by google?

You can do site:example.com searches with  results per page, but if you
 try to do so with a script, then you will be stopped after just a few requests.

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Security issue for sitemap SEO?

They typically name their sitemap something like sitemapRXTNAP.xml and submit it to Google using webmaster tools, rather than listing it in robots.txt

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how access a method in the parent class that's been overridden in the child?

Prefix parent:: to the method name:

class shape {
    function draw( ) {
        // write to screen
    }
}

class circle extends shape {
   function draw($origin, $radius) {
      // validate data
      if ($radius > 0) {
          parent::draw( );
          return true;
      }

      return false;
   }
}

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how execute different code depending on the number and type of arguments passed to a method?

PHP doesn't support method polymorphism as a built-in feature. However, you can emulate it using various type-checking functions. The following combine( ) function uses is_numeric(), is_string(), is_array(), and is_bool():

// combine() adds numbers, concatenates strings, merges arrays,
// and ANDs bitwise and boolean arguments
function combine($a, $b) {
    if (is_numeric($a) && is_numeric($b)) {
        return $a + $b;
    }

    if (is_string($a)  && is_string($b))  {
        return "$a$b";
    }

    if (is_array($a)   && is_array($b))   {
        return array_merge($a, $b);
    }

    if (is_bool($a)    && is_bool($b))    {
        return $a & $b;
    }

    return false;
}

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want to link two objects, so when you update one, you also update the other?

Use =& to assign one object to another by reference:

$adam = new user;
$dave =& $adam;

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how eliminate an object?

Objects are automatically destroyed when a script terminates. To force the destruction of an object, use unset( ):

$car = new car; // buy new car
...
unset($car);    // car wreck

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how create a new instance of an object?

Define the class, then use new to create an instance of the class:

class user {
    function load_info($username) {
       // load profile from database
    }
}

$user = new user;
$user->load_info($_REQUEST['username']);

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exchange the values in two variables without using additional variables for storage?

To swap $a and $b:

list($a,$b) = array($b,$a);

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