48 lines
1.2 KiB
PHP
48 lines
1.2 KiB
PHP
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<?php
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define('MSZ_PAGINATION_PAGE_START', 1);
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define('MSZ_PAGINATION_OFFSET_INVALID', -1);
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function pagination_create(int $count, int $range): array
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{
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$pages = ceil($count / $range);
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return compact('count', 'range', 'pages');
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}
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function pagination_is_valid_array(array $pagination): bool
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{
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return !empty($pagination['count']) && !empty($pagination['range']);
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}
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function pagination_is_valid_offset(int $offset): bool
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{
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return $offset !== MSZ_PAGINATION_OFFSET_INVALID;
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}
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// Adds 'page' and 'offset' to the pagination array transparently!!!
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function pagination_offset(array &$pagination, ?int $page): int
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{
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if (!pagination_is_valid_array($pagination)) {
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return MSZ_PAGINATION_OFFSET_INVALID;
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}
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$page = $page ?? MSZ_PAGINATION_PAGE_START;
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if ($page < MSZ_PAGINATION_PAGE_START) {
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return MSZ_PAGINATION_OFFSET_INVALID;
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}
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$offset = $pagination['range'] * ($page - 1);
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if ($offset > $pagination['count']) {
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return MSZ_PAGINATION_OFFSET_INVALID;
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}
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$pagination['page'] = $page;
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return $pagination['offset'] = $offset;
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}
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function pagination_param(string $name = 'p', int $default = 1, ?array $source = null): int
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{
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return (int)(($source ?? $_GET)[$name] ?? $default);
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}
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