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<?php namespace Rde; |
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use ArrayAccess; |
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use Iterator; |
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class Arr implements ArrayAccess, Iterator |
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{ |
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protected $resource; |
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protected $resource_resolved; |
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protected $is_resolved; |
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protected $queues; |
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public function __construct($resource) |
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{ |
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$this->resource = $resource; |
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$this->init(); |
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} |
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public function filter($driver) |
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{ |
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$this->queues[] = function($v, $k) use($driver) { |
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return array( |
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$driver($v, $k), |
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'filter', |
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); |
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}; |
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$this->setUnresolved(); |
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return $this; |
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} |
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public function take($cnt) |
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{ |
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$this->queues[] = function() use($cnt) { |
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static $_cnt; |
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(null === $_cnt) and $_cnt = $cnt; |
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return array( |
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0 < $_cnt--, |
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'take', |
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); |
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}; |
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$this->setUnresolved(); |
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return $this; |
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} |
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public function init() |
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{ |
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$this->is_resolved = true; |
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$this->resource_resolved = $this->resource; |
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$this->queues = array(); |
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} |
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public function each($callback) |
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{ |
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$this->isResolved() ? |
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$this->eachResourceResolved($callback) : |
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$this->resolve($callback); |
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} |
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protected function setUnresolved() |
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{ |
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$this->is_resolved = false; |
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} |
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protected function isResolved() |
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{ |
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return $this->is_resolved; |
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} |
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protected function resolve($callback = null) |
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{ |
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$this->resource_resolved = array(); |
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$callback = is_callable($callback) ? $callback : function(){}; |
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foreach ($this->resource as $k => $v) { |
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foreach ($this->queues as $driver) { |
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$resolve = $driver($v, $k); |
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if ( ! $resolve[0]) { |
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if ('take' === $resolve[1]) { |
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break 2; |
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} |
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continue 2; |
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} |
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} |
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$this->resource_resolved[$k] = $v; |
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$callback($v, $k); |
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} |
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$this->is_resolved = true; |
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} |
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protected function eachResourceResolved($callback) |
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{ |
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foreach ($this->resource_resolved as $k => $v) { |
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$callback($v, $k); |
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} |
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} |
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public function offsetExists($key) |
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{ |
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$this->isResolved() or $this->resolve(); |
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return isset($this->resource_resolved[$key]); |
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} |
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public function offsetGet($key) |
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{ |
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$this->isResolved() or $this->resolve(); |
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return $this->resource_resolved[$key]; |
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} |
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public function offsetSet($key, $val) |
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{ |
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$this->isResolved() or $this->resolve(); |
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if (null === $key) { |
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$this->resource_resolved[] = $val; |
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} else { |
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$this->resource_resolved[$key] = $val; |
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} |
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} |
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public function offsetUnset($key) |
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{ |
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$this->isResolved() or $this->resolve(); |
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unset($this->resource_resolved[$key]); |
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} |
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public function current() |
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{ |
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$this->isResolved() or $this->resolve(); |
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return current($this->resource_resolved); |
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} |
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public function key() |
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{ |
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$this->isResolved() or $this->resolve(); |
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return key($this->resource_resolved); |
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} |
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public function next() |
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{ |
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$this->isResolved() or $this->resolve(); |
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return next($this->resource_resolved); |
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} |
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public function rewind() |
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{ |
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$this->isResolved() or $this->resolve(); |
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reset($this->resource_resolved); |
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} |
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public function valid() |
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{ |
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return null !== $this->key(); |
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} |
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} |
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colindev /
common
Loading history...
PHP has two types of connecting operators (logical operators, and boolean operators):
and&&or||The difference between these is the order in which they are executed. In most cases, you would want to use a boolean operator like
&&, or||.Let’s take a look at a few examples:
Logical Operators are used for Control-Flow
One case where you explicitly want to use logical operators is for control-flow such as this:
Since
dieintroduces problems of its own, f.e. it makes our code hardly testable, and prevents any kind of more sophisticated error handling; you probably do not want to use this in real-world code. Unfortunately, logical operators cannot be combined withthrowat this point:These limitations lead to logical operators rarely being of use in current PHP code.