19 lines
481 B
PHP
19 lines
481 B
PHP
<?php
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if (!function_exists('getDistanceInMeters')) {
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function getDistanceInMeters($lat1, $lon1, $lat2, $lon2) {
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$earthRadius = 6371000; // radius (meter)
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$dLat = deg2rad($lat2 - $lat1);
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$dLon = deg2rad($lon2 - $lon1);
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$a = sin($dLat/2) * sin($dLat/2) +
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cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
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sin($dLon/2) * sin($dLon/2);
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$c = 2 * atan2(sqrt($a), sqrt(1-$a));
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return $earthRadius * $c;
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}
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}
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