[Nailing Down The Foreach Loop.]

Greetings,

 

I think I understand the logic flow inherit in nested foreach loops. However, I'd like to be sure. I've annotated a nested foreach from this book with my understanding of its function commented in with the code. Insights would be appreciated.

 

foreach ( $books as $title => $chapters ) # Look at the first key/value pair in $books. Assign the key to $title and the value to $chapters (in this case, the value is another array). The $chapters variable holds the T2 array, and carries it down to the nested foreach loop.

{

print

"<p>

$title

";

# Print the key (in this case, a string).

foreach

(

$chapters

as

$number

=>

$chapter

)

# Look at the first key/value pair in the T2 array. Assign the key to $number and the value to $chapter. In this case the value is a string.

{

print

"<br />Chapter

$number

is

$chapter

";

# Print the key and the value (associative array, they are both strings).

}

# The nested foreach loop will auto-increment through each key/vaue pair in the T2 array before exiting. Once exited flow is handed back up to the T1 foreach loop.

print

'</p>';

} # Repeat this process for each key/value pair in the T1 array level via auto-increment.

unset($title, $chapters, $chapter, $number); # Clear all of the dummy variables used so they do not affect later constructs.

 

 

Thanks