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file_get_contents
Posted on November 18th, 2010 1 commentThe file_get_contents() function in PHP reads the content of a file into a string (or reads the HTML of a web page into a string).
PHP
$body = file_get_contents( 'http://www.google.com' ); echo $body; /* ... HTML source of www.google.com ... */
To replicate this functionality in Ruby, we will use the Net/HTTP class from Ruby.
Ruby
require 'net/http'; uri = 'http://www.google.com'; body = Net::HTTP.get_response(URI.parse(self)).body; p result # ... HTML source of www.google.com ...
This page was contributed by Cemil Necefov. Thanks!
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array_fill_keys
Posted on November 11th, 2010 1 commentThe array_fill_keys() function in PHP allows you to populate the values of an array while specifying its keys.
PHP
$keys = array('write', 'debug', 'execute'); $result = array_fill_keys($keys, 'code'); var_export($result); // => array('write' => 'code', 'debug' => 'code', 'execute' => 'code')
To replicate this functionality in Ruby, we need to use a Hash object, since arrays in Ruby don’t use associative key/value pairs.
Ruby
keys = ['write', 'debug', 'execute'] result = keys.inject({}) do |hash, key| hash[key] = 'code' hash end p result # => {"write"=>"code", "debug"=>"code", "execute"=>"code"}
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array_merge
Posted on October 19th, 2010 1 commentThe array_merge() function in PHP merges 2 arrays by appending the second array onto the first array, and returning the resulting array.
The way to do this in Ruby depends on the type of data - if dealing with associative arrays (known as a hash in Ruby), we can use the merge() method of the Ruby Hash class.
PHP
$user_details = array('name' => 'John', 'age' => 20); $account_details = array('credits' => '50', 'id' => 4); $user = array_merge($user_details, $account_details); print_r($user); /* Array ( [name] => John [age] => 20 [credits] => 50 [id] => 4 ) */
Ruby
user_details = { :name => 'John', :age => 20 } account_details = { :credits => 50, :id => 4 } p user_details.merge(account_details); # => {:credits=>50, :name=>"John", :id=>4, :age=>20}
Merging numeric arrays in Ruby is much easier as shown below (PHP example given first).
PHP
$start = array(1, 2, 3); $finish = array(4, 5, 6); $nums = array_merge($start, $finish); print_r($nums); /* Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) */
Ruby
start = [1, 2, 3]; finish = [4, 5, 6]; nums = start + finish; p nums; # => [1, 2, 3, 4, 5, 6]
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array_fill
Posted on October 13th, 2010 1 commentThe array_fill() function in PHP allows an array to be populated (i.e. filled) with a particular value.
PHP
$a = array_fill(3, 5, 'php'); print_r($a); /* Array ( [3] => php [4] => php [5] => php [6] => php [7] => php ) */
In Ruby this is not really possible because Ruby arrays must have their keys filled in the correct order, i.e. you cant skip assigning values to keys in a Ruby array. As such, the next best thing is to fill those values with nil, or use a hash instead.
Ruby
a = [nil] * 3 + ['php'] * 5; puts a; # => [nil, nil, nil, 'php', 'php', 'php', 'php', 'php']
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array_flip
Posted on April 19th, 2010 3 commentsThe array_flip() PHP function changes all the keys in an array into values, and all the values into keys.
PHP
$a = array('apple' => 1, 'ibm' => 2, 'sun' => 3); $flipped = array_flip($a); print_r($flipped); /* Array ( [1] => apple [2] => ibm [3] => sun ) */
To replicate this functionality in Ruby, we will use a Hash object, since arrays in Ruby don’t use associative key / value pairs.
Ruby
hash = { "apple" => 1, "ibm" => 2, "sun" => 3 }; flipped = hash.invert; p flipped; # => {1 => "apple", 2 => "ibm", 3 => "sun"}
In PHP, the array_flip() function will over write any conflicting keys. The Ruby invert() method behaves the same - any keys which are the same as other keys will overwrite the previous one.
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call_user_func
Posted on March 27th, 2010 No commentsThe call_user_func() function in PHP calls a user defined function as specified by the first parameter. You can also use call_user_func() to call an instance method of an object by using an array(instance, methodName) parameter as follows:
PHP
class User{ private $name = null; public function __construct($name){ $this->name = $name; } public function getName(){ return $this->name; } } $user = new User('Shaymol'); echo call_user_func( array($user, 'getName') ); // => Shaymol
To get same behavior in Ruby we can call the send() method of an object as follows:
Ruby
# define a user class class User attr_accessor :name def initialize(name) @name = name.capitalize end end # create a user object user = User.new('Shaymol') # this is similar to user.name, and in PHP similar to call_user_func($obj, 'methodName'); puts user.send(:name) # => Shaymol
This page was contributed by Shaymol. Thanks!
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array_keys
Posted on February 24th, 2010 No commentsThe array_keys() function in PHP takes an array as it’s argument and returns all the keys in that array (as a numeric array).
PHP
$array = array('go' => 'green', 'stop' => 'red'); var_dump( array_keys($array) ); /* Array ( [0] => go [1] => stop ) */
To replicate this functionality in Ruby, we need to use a Hash object, since arrays in Ruby don’t use associative key/value pairs.
Ruby
array = { :go => 'green', :stop => 'red' }; puts array.keys; # => [:go, :stop]
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array_product
Posted on February 17th, 2010 No commentsThe array_product() PHP function returns the product of all values in an array. In other words, it multiplies all values in the array together, and returns the result as a number.
PHP
$a = array('1', '2', '3'); $product_total = array_product($a); echo $product_total; // => 6
Ruby
a = [ "1", "2", "3" ]; product_total = a.inject {|product, element| product * element } puts product_total; # => 6
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array_rand
Posted on February 16th, 2010 1 commentThe array_rand() function in PHP randomly selects one or more elements from an array.
PHP
$users = array('john', 'jane', 'tim', 'alex'); $lucky_winner = array_rand($users); echo $lucky_winner; // alex
Ruby
users = [ 'john', 'jane', 'tim', 'alex' ]; lucky_winner = users[rand(users.length)]; puts lucky_winner; # => alex
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array_reverse
Posted on October 25th, 2009 No commentsThe array_reverse() function in PHP reverses the order of the elements in an array.
PHP
$a = array('php', 'ruby', 'java'); $results = array_reverse($a); print_r($results); /* Array ( [0] => 'java' [1] => 'ruby' [2] => 'php' ) */
To replicate this functionality in Ruby, we can use the reverse method of the Array object.
Ruby
a = [ "php", "ruby", "java" ]; p a.reverse; # => ["java", "ruby", "php"]
