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@ 2014-05-07T22:12:08Z

<?php

class ringBuffer implements ArrayAccess {
    private $data;
    private $current = 0;



    public $size;

    public function __construct($sz=10) {
        $this->size = $sz;
        foreach(range(1, $sz) as $k=>$v) {
            /* s: whether this node is set; d: whether this node is "dirty" (has been read since it was last set); v: the value */
            $this->data[$k] = array('s' => false, 'd' => false, 'v' => NULL);
        }
    }

    private function offsetSet($key, $value) {
        $this->throwEx(array('Do not directly set indices in a %s, use push() instead', __CLASS__));
        return false;
    }

    public function offsetGet($key) {
        if (! is_int($key)) $this->throwEx(array("offset '%s' must be an integer, not %s", $key, gettype($key)));
        if ($key > $this->size) $key %= $this->size;
        if (!isset($this->data[$key])) return false;
        if (!$this->data[$key]['s']) return false;

        $this->data[$key]['d'] = false;
        return $this->data[$key]['v'];
    }

    public function offsetExists($key) {
        if (! is_int($key))
            throw new Exception();
        if ($key > $this->size)
            return $this->data[$key]['s'];
    }

    public function offsetUnset($key) {
        $this->data[$key]['s'] = false;
        $this->data[$key]['v'] = NULL;
    }

    private function throwEx() {
        $args = func_get_args();
        if (is_array($args0)) {
            $msg = call_user_func_array('sprintf', $args0);
        }
        throw new Exception($msg);
    }

    public function push($value) {
        if ($this->current >= $this->size) $this->current %= $this->size;
        $this->data[$this->current] = array('s'=>true, 'd'=>true, 'v' => $value);
        $this->current++;
        return $value;
    }
}

    
$a = new ringBuffer(2);



    
$a->push("foo");

$a->push("bar");

$a->push("baz");



    
var_dump($a);



    
/* Will throw an exception because you can't directly set indices in a ringBuffer */

$a0 = 'foo';



    
/* Will throw an exception because ringBuffer indices must be ints */

var_dump($a['foo']);

var_dump($a[1.0]);

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: Return type of ringBuffer::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/239iL on line 34 Deprecated: Return type of ringBuffer::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/239iL on line 24 Fatal error: Access level to ringBuffer::offsetSet() must be public (as in class ArrayAccess) in /in/239iL on line 19
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: Fatal error: Access level to ringBuffer::offsetSet() must be public (as in class ArrayAccess) in /in/239iL on line 19
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.12 - 7.3.33: Fatal error: Access level to ringBuffer::offsetSet() must be public (as in class ArrayAccess) in /in/239iL on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/239iL on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting '{' in /in/239iL on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `'{'' in /in/239iL on line 3
Process exited with code 255.

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