PHP can be cool like Ruby - 從ruby學到的高效率寫法

Looping
Yes yes, the good old for loop.

for ($i = 1, $i <= 10; $i++) {
    print "Processing $
";
}

The simple act of doing something 10 times. Ugly huh? He's one way to do it in Ruby..

1.upto(10) do |i|
    puts "Processing #{i}"
end

Nifty, huh? Meet PHP's range function

foreach(range(1, 10) as $i) {
    print "Processing $i";
}

The range function returns an array with values 1 through 10. I almost NEVER use for anymore, most of the time I use foreach. Range can also return letters, such as a through z, but I find that a bit obscure for what I do. I don't know if I've ever needed to loop through the alphabet in any of my web development

Do this to each element in my array
Another thing I was finding I really liked in ruby was the each method. In ruby, to loop through an array and pass each element to a function:

def sayHi ( member ) 
    puts "Hi #{member}"
end
 
family = ['mom', 'dad, 'brother', 'sister']
family.each |member| { sayHi (member) }

A bit simplistic of an example, I know. Here's some php

function sayHi($member) {
   print "Hi $member";
}
$family = array('mom','dad','brother','sister');

# normally I'd do it like this:
foreach($family as $member) {
   sayHi($member);
}

#but recently found this command
array_walk($family, 'sayHi' )

You could argue that this is simplier than the Ruby code above. Yeah, maybe. It would help if it wasn't such a badly named function (nothing new there for us php programmers). I think array_each would of been a better name...but phish..what do I know?

Ok, so arrays can walk but can they run? (sorry, bad joke), err can they run a function on each element and return something? Yes they can, check out array_map! Beware the parameters are switched in map, function name first then array. Doh. One of the most practical uses I've found for map is trimming data coming from a form:

$raw_data = $_POST['form'];
$trimmed_data = array_map('trim',$raw_data);

#previously I would have done
foreach($raw_data as $name => $value) {
    $trimmed_data[$name] = trim($value);
}

Another good use for map is cleaning the data, stripping slashes..etc.

Read up on the php documentation for range and array_map, you might find some more interesting uses for them! Even if you don't use ruby, take a look at the ruby functions. You might learn something :)

PHP Links:

• Array Walk
• Array Map
• Range

Ruby Links:

• Array each
• Array map (actually its a synonym for collect)