array_unshift

The array_unshift() function in PHP prepends elements onto the beginning of an array.

PHP

$cue = array('http', 'https', 'ftp');
array_unshift($cue, 'ssh');
print_r($cue);
/*
Array (
	[0] => ssh
	[1] => http
	[2] => https
	[3] => ftp
)
*/

Ruby has an identical Array method, named unshift:

Ruby

cue = [ "http", "https", "ftp" ];
cue.unshift('ssh');
puts cue;
# => [ "ssh", "http", "https", "ftp"]

list

The list() function in PHP is used to assign multiple variables as if they were an array. Technically, list() is not a function in PHP, it is a language construct.

Ruby has no real need for a function such as list(), as the same can be achieve using parallel assignment - i.e. assigning comma separated variables to elements of an array using the normal assignment operator.

PHP

$langs = array('php', 'ruby', 'perl');
list($lang1, $lang2, $lang3) = $langs;
echo $lang1;	// php
echo $lang2;	// ruby
echo $lang3;	// perl

Ruby

langs = [ "php", "ruby", "perl" ];
lang1, lang2, lang3 = langs;
puts lang1;	# php
puts lang2;	# ruby
puts lang3;	# perl

in_array

The in_array() function in PHP checks if a value exists in an array - returning true if it does, or false otherwise.

The last argument in this function forces a strict type check of the value in PHP. Since Ruby does not consider a Fixnum of 1 and a String of ‘1′ to be the same - it always operates as if the last argument were set to true.

PHP

$my_array = array('a', 'b', 'c', 'd');
if('a', in_array($a), true) {
	echo 'Found it in the array';
}
// => Found it in the array

Ruby

my_array = [ "a", "b", "c", "d" ];
if( my_array.include?('a') ) {
	 puts 'Found it in the array';
}
# => Found it in the array

reset

The reset() function in PHP sets the internal pointer of an array to its first element. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s reset() function.

pos

The pos() function is only an alias of current, which returns the key and value of the element the current array pointer is pointing to. However since Ruby doesn’t have an internal array pointer, this function does not have a Ruby equivalent.

For further information about pos(), see current().

current

The current() function in PHP returns the key and value of the element the current array pointer is pointing to. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s current() function.

key

The key() function in PHP returns the index element of the element the current array pointer is pointing to. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s key() function.

end

The end() function in PHP moves the internal array pointer to the last element in the array. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s end() function. However Ruby does have the Array::last() method which returns the last element of an array.

PHP

$programming = array('java', 'ruby', 'python', 'php');
$language = end($programming);
print_r($language);
// => php

Ruby

programming = ['java', 'ruby', 'python', 'php'];
language = programming.last;
puts language;
=> # php

next

The next() function in PHP moves the internal array pointer one place forward. However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s next() function.

prev

The prev() function in PHP moves the internal array pointer to the previous element (rewinds). However in Ruby, there is no internal array pointer - as such Ruby doesn’t have an equivalent to PHP’s prev() function.