Which of the following statements is true?

$_SERVER consists of data provided by the web server and is therefore trustworthy.

What is the length of a string returned by: md5(rand(), TRUE);

Which sentence describes the following regular expression match?
<code>
preg_match(‘/^\d*(?:\.[0-9]+)?$/’, $test);
</code>

Under which circumstances is the $_SESSION super-global available? (Choose 2)

Which of the following statements about database connections are commonly true? (Choose 2)

What can prevent PHP from being able to open a file on the hard drive (Choose 3)?

Consider the following code:
<code>
strspn($test, ‘aeiou’, 1);
</code>
The variable $test contains the string “You get certified”.
What will the function call return?

When a browser requests an image identified by an img tag, it never sends a Cookie header.

How can the id attribute of the 2nd baz element from the XML string below be retrieved from the
SimpleXML object found inside $xml?
<code>
<?xml version=’1.0′?>
<foo>
<bar>
<baz id=”1″>One</baz>
<baz id=”2″>Two</baz>
</bar>
</foo>
</code>