Previous/Current iterator

Allows iteration over an array but returns two items at a time stepping by one item at a time. Thus, the iterator for, _(*2)

['a', 'b', 'c', 'd']

Will return, _(*3)

['previous' => 'a', 'current' => 'b']
['previous' => 'b', 'current' => 'c']
['previous' => 'c', 'current' => 'd']

Current/Next iterator

Allows iteration over an array but returns two items at a time stepping by one item at a time. Thus, the iterator for, _(*4)

['a', 'b', 'c', 'd']

Will return, _(*5)

['current' => 'a', 'next' => 'b']
['current' => 'b', 'next' => 'c']
['current' => 'c', 'next' => 'd']
['current' => 'd', 'next' => null]

Installation

To install it, just include this requirement into your composer.json, _(*6)

{
    "require": {
        "crazycodr/previous-current-iterator": "1.*"
    }
}

And then run composer install/update as necessary., _(*7)

Supports

Only PHP 5.5 or more can be supported due to the fact that key() can only return arrays starting with PHP 5.5!, _(*8)

Examples

To use the PreviousCurrentIterator, just instanciate a copy with an array and foreach it!, _(*9)

$data = ['a', 'b', 'c', 'd'];
foreach(new PreviousCurrentIterator($data) as $keys => $values) {
    //Compare previous and current
    if ($values['previous'] !== $values['current']) {
        echo 'Not the same<br />';
    }
}

To use the CurrentNextIterator, just instanciate a copy with an array and foreach it!, _(*10)

$data = ['a', 'b', 'c', 'd'];
foreach(new CurrentNextIterator($data) as $keys => $values) {
    //Compare previous and current
    if ($values['next'] !== null) {
        if ($values['current'] !== $values['next']) {
            echo 'Not the same<br />';
        }
    }
}