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<?php $array = range(1,100000); //100k items, ordered. function searchInArray(array $haystack, $needle) { $needle = (int)$needle; $currPos = (int)(count($haystack) / 2); $topBoundry = count($haystack); $bottomBoundry = 0; $moves = 0; while ($currPos >= $bottomBoundry && $currPos <= $topBoundry) { $currItem = $haystack[$currPos]; if ($currItem == $needle) { echo "Found item in $moves moves!"; return $currPos; } else if ($currItem < $needle) { $currPos -= floor($currPos/2); $moves++; } else if ($currItem > $needle) { $currPos += ceil($currPos/2); $moves++; } echo "Move: $moves. Current: $currPos:$currItem"; } } echo searchInArray($array, 420);
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Move: 1. Current: 75000:50001Move: 2. Current: 112500:75001
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/TVtum on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/TVtum on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/TVtum on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/TVtum on line 5
Process exited with code 255.

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