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<?php function BinSearch($needle, $haystack) { $m = ceil(count($haystack) / 2); $z = $haystack[$m]; if ($needle == $haystack[$m]) { return "Found at index: $haystack[$needle]"; $upper = array_slice($haystack, -$m, count($haystack)); return BinSearch($needle, $upper); } else if ($needle < $haystack[$m]) { $lower = array_slice($haystack, 0, $m); return BinSearch($needle, $lower); } } $countries = array("Afghanistan", "Aland Islands", "Albania", "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla", "Antarctica", "Antigua", "Argentina", "Armenia", "Aruba", "Australia", "Austria", "Azerbaijan", "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Barbuda", "Belarus", "Belgium", "Belize", "Benin", "Bermuda", "Bhutan", "Bolivia", "Bosnia", "Botswana", "Bouvet Island", "Brazil", "British Indian Ocean Trty.", "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi", "Caicos Islands", "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands", "Central African Republic", "Chad", "Chile", "China", "Christmas Island", "Cocos (Keeling) Islands", "Colombia", "Comoros", "Congo", "Congo, Democratic Republic of the", "Cook Islands", "Costa Rica", "Cote d'Ivoire", "Croatia", "Cuba", "Cyprus", "Czech Republic", "Denmark", "Djibouti", "Dominica", "Dominican Republic", "Ecuador", "Egypt", "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia", "Falkland Islands (Malvinas)", "Faroe Islands", "Fiji", "Finland", "France", "French Guiana", "French Polynesia", "French Southern Territories", "Futuna Islands", "Gabon", "Gambia", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece", "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala", "Guernsey", "Guinea", "Guinea-Bissau", "Guyana", "Haiti", "Heard", "Herzegovina", "Holy See", "Honduras", "Hong Kong", "Hungary", "Iceland", "India", "Indonesia", "Iran (Islamic Republic of)", "Iraq", "Ireland", "Isle of Man", "Israel", "Italy", "Jamaica", "Jan Mayen Islands", "Japan", "Jersey", "Jordan", "Kazakhstan", "Kenya", "Kiribati", "Korea", "Korea (Democratic)", "Kuwait", "Kyrgyzstan", "Lao", "Latvia", "Lebanon", "Lesotho", "Liberia", "Libyan Arab Jamahiriya", "Liechtenstein", "Lithuania", "Luxembourg", "Macao", "Macedonia", "Madagascar", "Malawi", "Malaysia", "Maldives", "Mali", "Malta", "Marshall Islands", "Martinique", "Mauritania", "Mauritius", "Mayotte", "McDonald Islands", "Mexico", "Micronesia", "Miquelon", "Moldova", "Monaco", "Mongolia", "Montenegro", "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia", "Nauru", "Nepal", "Netherlands", "Netherlands Antilles", "Nevis", "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria", "Niue", "Norfolk Island", "Northern Mariana Islands", "Norway", "Oman", "Pakistan", "Palau", "Palestinian Territory, Occupied", "Panama", "Papua New Guinea", "Paraguay", "Peru", "Philippines", "Pitcairn", "Poland", "Portugal", "Principe", "Puerto Rico", "Qatar", "Reunion", "Romania", "Russian Federation", "Rwanda", "Saint Barthelemy", "Saint Helena", "Saint Kitts", "Saint Lucia", "Saint Martin (French part)", "Saint Pierre", "Saint Vincent", "Samoa", "San Marino", "Sao Tome", "Saudi Arabia", "Senegal", "Serbia", "Seychelles", "Sierra Leone", "Singapore", "Slovakia", "Slovenia", "Solomon Islands", "Somalia", "South Africa", "South Georgia", "South Sandwich Islands", "Spain", "Sri Lanka", "Sudan", "Suriname", "Svalbard", "Swaziland", "Sweden", "Switzerland", "Syrian Arab Republic", "Taiwan", "Tajikistan", "Tanzania", "Thailand", "The Grenadines", "Timor-Leste", "Tobago", "Togo", "Tokelau", "Tonga", "Trinidad", "Tunisia", "Turkey", "Turkmenistan", "Turks Islands", "Tuvalu", "Uganda", "Ukraine", "United Arab Emirates", "United Kingdom", "United States", "Uruguay", "US Minor Outlying Islands", "Uzbekistan", "Vanuatu", "Vatican City State", "Venezuela", "Vietnam", "Virgin Islands (British)", "Virgin Islands (US)", "Wallis", "Western Sahara", "Yemen", "Zambia", "Zimbabwe"); $country = "Pakistan"; $time_start = microtime(true); echo BinSearch($country, $countries) . PHP_EOL; echo 'Total execution time in seconds: ' . number_format(microtime(true) - $time_start, 20) . PHP_EOL; $time_start = microtime(true); array_search($country, $countries); echo 'Total execution time in seconds: ' . number_format(microtime(true) - $time_start, 20) . PHP_EOL;
based on OnSd4
Output for 7.4.1
Total execution time in seconds: 0.00004506111145019531 Total execution time in seconds: 0.00000405311584472656
Output for 7.4.0
Total execution time in seconds: 0.00004100799560546875 Total execution time in seconds: 0.00000190734863281250
Output for 7.3.13
Total execution time in seconds: 0.00004792213439941406 Total execution time in seconds: 0.00000286102294921875
Output for 7.3.12
Total execution time in seconds: 0.00005197525024414062 Total execution time in seconds: 0.00000309944152832031
Output for 7.3.11
Total execution time in seconds: 0.00005912780761718750 Total execution time in seconds: 0.00000309944152832031
Output for 7.3.10
Total execution time in seconds: 0.00006103515625000000 Total execution time in seconds: 0.00000405311584472656
Output for 7.3.9
Total execution time in seconds: 0.00002884864807128906 Total execution time in seconds: 0.00000095367431640625
Output for 7.3.8
Total execution time in seconds: 0.00003695487976074219 Total execution time in seconds: 0.00000095367431640625
Output for 7.3.7
Total execution time in seconds: 0.00003886222839355469 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.15, 7.3.6
Total execution time in seconds: 0.00003409385681152344 Total execution time in seconds: 0.00000095367431640625
Output for 7.3.5
Total execution time in seconds: 0.00003409385681152344 Total execution time in seconds: 0.00000190734863281250
Output for 7.3.4
Total execution time in seconds: 0.00004410743713378906 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.9, 7.1.11, 7.3.3
Total execution time in seconds: 0.00003004074096679688 Total execution time in seconds: 0.00000214576721191406
Output for 7.1.28, 7.3.2
Total execution time in seconds: 0.00004696846008300781 Total execution time in seconds: 0.00000286102294921875
Output for 7.3.1
Total execution time in seconds: 0.00003504753112792969 Total execution time in seconds: 0.00000286102294921875
Output for 7.3.0
Total execution time in seconds: 0.00002908706665039062 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.26
Total execution time in seconds: 0.00005197525024414062 Total execution time in seconds: 0.00000405311584472656
Output for 7.1.14, 7.2.25
Total execution time in seconds: 0.00004100799560546875 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.24
Total execution time in seconds: 0.00006389617919921875 Total execution time in seconds: 0.00000286102294921875
Output for 7.1.16, 7.2.17, 7.2.23
Total execution time in seconds: 0.00003695487976074219 Total execution time in seconds: 0.00000190734863281250
Output for 7.2.22
Total execution time in seconds: 0.00004506111145019531 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.21
Total execution time in seconds: 0.00005912780761718750 Total execution time in seconds: 0.00000381469726562500
Output for 7.2.20
Total execution time in seconds: 0.00004196166992187500 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.19
Total execution time in seconds: 0.00003814697265625000 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.18
Total execution time in seconds: 0.00005078315734863281 Total execution time in seconds: 0.00000309944152832031
Output for 7.2.16
Total execution time in seconds: 0.00003600120544433594 Total execution time in seconds: 0.00000190734863281250
Output for 7.2.14
Total execution time in seconds: 0.00003695487976074219 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.13
Total execution time in seconds: 0.00004982948303222656 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.6, 7.2.12
Total execution time in seconds: 0.00003504753112792969 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.11
Total execution time in seconds: 0.00003385543823242188 Total execution time in seconds: 0.00000190734863281250
Output for 7.2.10
Total execution time in seconds: 0.00005006790161132812 Total execution time in seconds: 0.00000190734863281250
Output for 7.2.9
Total execution time in seconds: 0.00003790855407714844 Total execution time in seconds: 0.00000119209289550781
Output for 7.2.8
Total execution time in seconds: 0.00004601478576660156 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.7
Total execution time in seconds: 0.00003385543823242188 Total execution time in seconds: 0.00000095367431640625
Output for 7.2.5
Total execution time in seconds: 0.00003600120544433594 Total execution time in seconds: 0.00000095367431640625
Output for 7.2.4
Total execution time in seconds: 0.00004220008850097656 Total execution time in seconds: 0.00000405311584472656
Output for 7.2.3
Total execution time in seconds: 0.00005006790161132812 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.2
Total execution time in seconds: 0.00005292892456054688 Total execution time in seconds: 0.00000286102294921875
Output for 7.2.1
Total execution time in seconds: 0.00004386901855468750 Total execution time in seconds: 0.00000214576721191406
Output for 7.2.0
Total execution time in seconds: 0.00004100799560546875 Total execution time in seconds: 0.00000309944152832031
Output for 7.1.33
Total execution time in seconds: 0.00006008148193359375 Total execution time in seconds: 0.00000596046447753906
Output for 7.1.2, 7.1.4, 7.1.32
Total execution time in seconds: 0.00003910064697265625 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.5, 7.1.31
Total execution time in seconds: 0.00003290176391601562 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.30
Total execution time in seconds: 0.00003790855407714844 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.26, 7.1.29
Total execution time in seconds: 0.00003695487976074219 Total execution time in seconds: 0.00000309944152832031
Output for 7.1.27
Total execution time in seconds: 0.00005292892456054688 Total execution time in seconds: 0.00000095367431640625
Output for 7.1.25
Total execution time in seconds: 0.00004506111145019531 Total execution time in seconds: 0.00000309944152832031
Output for 7.1.24
Total execution time in seconds: 0.00003504753112792969 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.23
Total execution time in seconds: 0.00004291534423828125 Total execution time in seconds: 0.00000286102294921875
Output for 7.1.22
Total execution time in seconds: 0.00003194808959960938 Total execution time in seconds: 0.00000214576721191406
Output for 7.1.21
Total execution time in seconds: 0.00005006790161132812 Total execution time in seconds: 0.00000405311584472656
Output for 7.1.20
Total execution time in seconds: 0.00003814697265625000 Total execution time in seconds: 0.00000286102294921875
Output for 7.1.19
Total execution time in seconds: 0.00003910064697265625 Total execution time in seconds: 0.00000286102294921875
Output for 7.1.18
Total execution time in seconds: 0.00004887580871582031 Total execution time in seconds: 0.00000405311584472656
Output for 7.1.17
Total execution time in seconds: 0.00003099441528320312 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.15
Total execution time in seconds: 0.00003004074096679688 Total execution time in seconds: 0.00000095367431640625
Output for 7.1.13
Total execution time in seconds: 0.00002789497375488281 Total execution time in seconds: 0.00000095367431640625
Output for 7.1.12
Total execution time in seconds: 0.00002884864807128906 Total execution time in seconds: 0.00000214576721191406
Output for 7.1.10
Total execution time in seconds: 0.00004005432128906250 Total execution time in seconds: 0.00000309944152832031
Output for 7.1.8
Total execution time in seconds: 0.00005412101745605469 Total execution time in seconds: 0.00000405311584472656
Output for 7.1.7
Total execution time in seconds: 0.00004005432128906250 Total execution time in seconds: 0.00000286102294921875
Output for 7.1.6
Total execution time in seconds: 0.00004696846008300781 Total execution time in seconds: 0.00000405311584472656
Output for 7.1.3
Total execution time in seconds: 0.00002694129943847656 Total execution time in seconds: 0.00000190734863281250
Output for 7.1.1
Total execution time in seconds: 0.00003314018249511719 Total execution time in seconds: 0.00000309944152832031
Output for 7.1.0
Total execution time in seconds: 0.00003194808959960938 Total execution time in seconds: 0.00000309944152832031