Associative Array

Associative Array

PHP Array

A PHP array can be thought of as a variable which can store multiple other variables. Every item in a PHP array is known as an element and is composed of a key and a value. There are 2 main types of PHP arrays:

1. Numeric Array
2. Associative Array

Each of these can in turn be a Multidimensional Array.

Example Numeric Array:

$terms = array('array', 'element', 'key', 'value');
var_dump($terms);
/* => Array
(
    [0] => array
    [1] => element
    [2] => key
    [3] => value
)
*/

Example Associative Array:

$terms = array(
	'term1' => 'array', 
	'term2' => 'element', 
	'term3' => 'key', 
	'term4' => 'value'
);
var_dump($terms);
/* => Array
(
    [term1] => array
    [term2] => element
    [term3] => key
    [term4] => value
)
*/

Find out more information about PHP’s Numeric Array, Associative Array or Multidimensional Array.

crc32

The crc32() function in PHP generates the cyclic redundancy checksum (CRC) polynomial of 32-bit lengths of a string, and returns it as an integer.

PHP

$checksum = crc32('hello world');
echo $checksum;
// => 222957957

Ruby

require 'zlib';
puts Zlib.crc32('hello world');
# => 222957957

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.