Zend PHP 5 Certification: Exam Question Assistance (06 May 2010)

I have just sat, and passed, another mock exam for the Zend PHP certification. The following questions came up in the test and I wondered if anyone would be able to help me out in obtaining the answers and the reasons (if possible). 🙂

[code=php]
<?php
function redirect($url) {
// Check to make sure we haven’t already sent
// the header:

if(???????) {
header(“Location: $url”);
}
}

?>
[/code]

What conditional should replace the ????? above?

Answers:

[LIST]

[code=php]
<?php
header(“Location: {$_GET[‘url’]}”);
?>
[/code]

Which of the following values of $_GET[‘url’] would cause session fixation?

Answers:

[LIST]

=========================================================

If regular expressions must be used, in general which type of regular expression functions available to PHP is preferred for performance reasons?

[LIST]

=========================================================

Many thanks,
Picco

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