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<?php |
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namespace API\Helpers; |
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class Paginator |
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{ |
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private $config; |
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private $countQuery; |
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private $paginationQuery; |
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private $totalItems; |
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private $totalPages; |
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public function __construct($query, $config, $db) |
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{ |
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$this->config = $config; |
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$this->craftQuries($query); |
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$this->performQueries($db); |
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} |
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/** |
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* create two queries out of the given query : |
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* - query to count the rows |
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* - query to paginate the data. |
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* |
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* @todo handle the case when the query already have the limit clause. |
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*/ |
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public function craftQuries($query) |
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{ |
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// replace the columns part with count(*) as total to number of rows |
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$this->countQuery = preg_replace('/(select ).*( from.*)/i', '$1 count(*) as total $2', $query); |
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$startFrom = ($this->config['current_page'] * $this->config['item_per_page']) - $this->config['item_per_page']; |
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$this->paginationQuery = $query.' limit '.$startFrom.', '.$this->config['item_per_page']; |
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} |
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public function performQueries($db) |
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{ |
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$this->totalItems = $db->query($this->countQuery)->fetch()['total']; |
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$this->totalPages = ceil($this->totalItems / $this->config['item_per_page']); |
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$this->currentItems = $db->query($this->paginationQuery)->fetchAll(); |
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} |
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public function getCurrentItems() |
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{ |
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return $this->currentItems; |
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} |
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public function getCurrentPage() |
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{ |
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return $this->config['current_page']; |
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} |
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public function getTotalItem() |
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{ |
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return $this->totalItems; |
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} |
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public function getRowsPerPage() |
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{ |
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return $this->config['item_per_page']; |
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} |
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public function getTotalPages() |
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{ |
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return $this->totalPages; |
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} |
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} |
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mazentouati /
snacks-console
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: