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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Sitemap\Url; |
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class SmartUrl extends Url |
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{ |
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/** |
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* @param string $loc |
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* @param \DateTimeImmutable|null $last_mod |
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* @param string|null $change_freq |
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* @param string|null $priority |
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*/ |
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public function __construct($loc, \DateTimeImmutable $last_mod = null, $change_freq = null, $priority = null) |
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{ |
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// priority from loc |
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if (!$priority) { |
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$priority = $this->priorityFromLoc($loc); |
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} |
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// change freq from last mod |
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if (!$change_freq && $last_mod instanceof \DateTimeImmutable) { |
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$change_freq = $this->changeFreqFromLastMod($last_mod); |
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} |
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// change freq from priority |
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if (!$change_freq) { |
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$change_freq = $this->changeFreqFromPriority($priority); |
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} |
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parent::__construct($loc, $last_mod, $change_freq, $priority); |
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} |
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/** |
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* @param string $loc |
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* |
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* @return string |
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*/ |
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private function priorityFromLoc($loc) |
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{ |
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// number of slashes |
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$num = count(array_filter(explode('/', trim($loc, '/')))); |
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if (!$num) { |
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return '1.0'; |
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} |
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if (($p = (10 - $num) / 10) > 0) { |
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return '0.'.($p * 10); |
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} |
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return '0.1'; |
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} |
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/** |
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* @param \DateTimeImmutable $last_mod |
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* |
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* @return string|null |
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*/ |
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private function changeFreqFromLastMod(\DateTimeImmutable $last_mod) |
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{ |
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if ($last_mod < new \DateTimeImmutable('-1 year')) { |
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return self::CHANGE_FREQ_YEARLY; |
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} |
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if ($last_mod < new \DateTimeImmutable('-1 month')) { |
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return self::CHANGE_FREQ_MONTHLY; |
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} |
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return null; |
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} |
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/** |
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* @param string $priority |
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* |
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* @return string |
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*/ |
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private function changeFreqFromPriority($priority) |
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{ |
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switch ($priority) { |
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case '1.0': |
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return self::CHANGE_FREQ_HOURLY; |
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case '0.9': |
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return self::CHANGE_FREQ_DAILY; |
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case '0.8': |
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return self::CHANGE_FREQ_DAILY; |
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case '0.7': |
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return self::CHANGE_FREQ_WEEKLY; |
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case '0.6': |
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return self::CHANGE_FREQ_WEEKLY; |
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case '0.5': |
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return self::CHANGE_FREQ_WEEKLY; |
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case '0.4': |
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return self::CHANGE_FREQ_MONTHLY; |
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case '0.3': |
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return self::CHANGE_FREQ_MONTHLY; |
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case '0.2': |
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return self::CHANGE_FREQ_YEARLY; |
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case '0.1': |
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return self::CHANGE_FREQ_YEARLY; |
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case '0.0': |
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return self::CHANGE_FREQ_NEVER; |
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default: |
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return null; |
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} |
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} |
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} |
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In PHP, under loose comparison (like
==
, or!=
, orswitch
conditions), values of different types might be equal.For
string
values, the empty string''
is a special case, in particular the following results might be unexpected: