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<?php $haystack = [-6, 0, 5, 10, 11, 12, 20]; $needles = [0, 3, 14, -3]; function getNearest($needle, $haystack) { if (!$haystack) { throw new Exception('empty haystack'); } $bestDistance = PHP_INT_MAX; foreach ($haystack as $value) { if ($value === $needle) { return $needle; } $distance = abs($value - $needle); if ($distance < $bestDistance) { $bestDistance = $distance; $keep = $value; } } return $keep ?? $value; // coalesc to silence potential IDE complaint } foreach ($needles as $needle) { // each test case echo "$needle -> " . getNearest($needle, $haystack) . "\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
0 -> 0 3 -> 5 14 -> 12 -3 -> -6

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