Elgg /
Elgg
implicit conversion of array to boolean.
| 1 | <?php |
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| 2 | namespace Elgg\Queue; |
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| 3 | |||
| 4 | /** |
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| 5 | * FIFO queue that uses the database for persistence |
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| 6 | * |
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| 7 | * WARNING: API IN FLUX. DO NOT USE DIRECTLY. |
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| 8 | * |
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| 9 | * @access private |
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| 10 | * |
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| 11 | * @package Elgg.Core |
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| 12 | * @subpackage Queue |
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| 13 | * @since 1.9.0 |
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| 14 | */ |
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| 15 | class DatabaseQueue implements \Elgg\Queue\Queue { |
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| 16 | |||
| 17 | /** @var string Name of the queue */ |
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| 18 | protected $name; |
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| 19 | |||
| 20 | /** @var \Elgg\Database Database adapter */ |
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| 21 | protected $db; |
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| 22 | |||
| 23 | /** @var string The identifier of the worker pulling from the queue */ |
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| 24 | protected $workerId; |
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| 25 | |||
| 26 | /** |
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| 27 | * Create a queue |
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| 28 | * |
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| 29 | * @param string $name Name of the queue. Must be less than 256 characters. |
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| 30 | * @param \Elgg\Database $db Database adapter |
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| 31 | */ |
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| 32 | 22 | public function __construct($name, \Elgg\Database $db) { |
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| 33 | 22 | $this->db = $db; |
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| 34 | 22 | $this->name = $name; |
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| 35 | 22 | $this->workerId = md5(microtime() . getmypid()); |
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| 36 | 22 | } |
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| 37 | |||
| 38 | /** |
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| 39 | * {@inheritdoc} |
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| 40 | */ |
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| 41 | 10 | public function enqueue($item) { |
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| 42 | 10 | $prefix = $this->db->prefix; |
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| 43 | 10 | $name = $this->db->sanitizeString($this->name); |
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| 44 | 10 | $blob = $this->db->sanitizeString(serialize($item)); |
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| 45 | 10 | $time = time(); |
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| 46 | |||
| 47 | 10 | $query = "INSERT INTO {$prefix}queue |
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| 48 | 10 | SET name = '$name', data = '$blob', timestamp = $time"; |
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| 49 | 10 | return $this->db->insertData($query) !== false; |
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| 50 | } |
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| 51 | |||
| 52 | /** |
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| 53 | * {@inheritdoc} |
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| 54 | */ |
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| 55 | 3 | public function dequeue() { |
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| 56 | 3 | $prefix = $this->db->prefix; |
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| 57 | 3 | $name = $this->db->sanitizeString($this->name); |
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| 58 | 3 | $worker_id = $this->db->sanitizeString($this->workerId); |
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| 59 | |||
| 60 | 3 | $update = "UPDATE {$prefix}queue |
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| 61 | 3 | SET worker = '$worker_id' |
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| 62 | 3 | WHERE name = '$name' AND worker IS NULL |
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| 63 | ORDER BY id ASC LIMIT 1"; |
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| 64 | 3 | $num = $this->db->updateData($update, true); |
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| 65 | 3 | if ($num === 1) { |
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| 66 | 2 | $select = "SELECT data FROM {$prefix}queue |
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| 67 | 2 | WHERE worker = '$worker_id'"; |
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| 68 | 2 | $obj = $this->db->getDataRow($select); |
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| 69 | 2 | if ($obj) { |
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| 70 | 2 | $data = unserialize($obj->data); |
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| 71 | 2 | $delete = "DELETE FROM {$prefix}queue |
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| 72 | 2 | WHERE name = '$name' AND worker = '$worker_id'"; |
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| 73 | 2 | $this->db->deleteData($delete); |
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| 74 | 2 | return $data; |
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| 75 | } |
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| 76 | } |
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| 77 | |||
| 78 | 2 | return null; |
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| 79 | } |
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| 80 | |||
| 81 | /** |
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| 82 | * {@inheritdoc} |
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| 83 | */ |
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| 84 | 1 | public function clear() { |
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| 85 | 1 | $prefix = $this->db->prefix; |
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| 86 | 1 | $name = $this->db->sanitizeString($this->name); |
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| 87 | |||
| 88 | 1 | $this->db->deleteData("DELETE FROM {$prefix}queue WHERE name = '$name'"); |
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| 89 | 1 | } |
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| 90 | |||
| 91 | /** |
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| 92 | * {@inheritdoc} |
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| 93 | */ |
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| 94 | 3 | public function size() { |
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| 95 | 3 | $prefix = $this->db->prefix; |
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| 96 | 3 | $name = $this->db->sanitizeString($this->name); |
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| 97 | |||
| 98 | 3 | $result = $this->db->getDataRow("SELECT COUNT(id) AS total FROM {$prefix}queue WHERE name = '$name'"); |
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| 99 | 3 | return (int) $result->total; |
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| 100 | } |
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| 101 | } |
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| 102 | |||
| 103 |
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.