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run code in 200+ php & hhvm versions
Bugs & Features
<?php class Container implements ArrayAccess, Countable, Iterator, JsonSerializable, Serializable { protected $values; public function __construct(... $values) { $this->values = []; foreach ($values as $value) { if (is_array($value)) { foreach ($value as $val) { $this->append($val); } } else { $this->append($value); } } } protected function validate($value) { return true; } protected function format($value) { return $value; } public function prepend($value) { if ($this->validate($value)) { array_unshift($this->values, $this->format($value)); return true; } return false; } public function shift() { return array_shift($this->values); } public function append($value) { if ($this->validate($value)) { array_push($this->values, $this->format($value)); return true; } return false; } public function pop() { return array_pop($this->values); } public function toArray() { return $this->values; } public function filter($callback) { $this->values = array_values(array_filter($this->values, $callback)); return $this; } public function map($callback) { $this->values = array_values(array_map([$this, 'format'], array_filter(array_map($callback, $this->values), [$this, 'validate']))); return $this; } public function offsetExists($offset) { return key_exists($offset, $this->values); } public function offsetGet($offset) { return ($this->offsetExists($offset) ? $this->values[$offset] : null); } public function offsetSet($offset, $value) { if (is_null($offset)) { $this->append($value); return; } if (!$this->offsetExists($offset)) { $cn = get_called_class(); throw new Exception("{$cn} cannot set value at index {$offset}."); } if ($this->validate($value)) { $this->values[$offset] = $this->format($value); } } public function offsetUnset($offset) { if ($this->offsetExists($offset)) { unset($this->values[$offset]); } } public function count() { return count($this->values); } public function current() { return current($this->values); } public function key() { return key($this->values); } public function next() { return next($this->values); } public function rewind() { reset($this->values); } public function valid() { return !is_null(key($this->values)); } public function jsonSerialize() { return $this->toArray(); } public function serialize() { return serialize($this->values); } public function unserialize($data) { $this->values = unserialize($data); } } class IntContainer extends Container { protected function validate($value) { return is_numeric($value); } protected function format($value) { return intval($value); } } $nums = new IntContainer(2, 4, 6, 8); var_dump( $nums->map(function ($num) { return sprintf("[%'10s]",sprintf("0x%08x",$num + 1)); }) ->toArray() );
based on v80dK
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(0) { }