<?php
/**
* To find the
*
**/
// In order to find
function normal_search($arrData,$val) {
$len = count($arrData);
if($len == 0) return -1;
for($i = 0;$i < $len; $i++ ) {
echo "find No.",$i + 1," value = ",$arrData[$i]," is = ",$val,"? <br/>";
// To find the
if($arrData[$i] == $val) return $i;
}
return -1;
}
// Test sequence lookup
$arrData = array(4,51,6,73,2,5,9,33,50,3,4,6,1,4,67);
echo normal_search($arrData,6),"<br/>";
echo normal_search($arrData,66),"<br/>";
// 2 Points method lookup ( Search for ordered columns )
function binary_search($arrData,$val) {
$len = count($arrData);
if($len == 0) return -1;
$start = 0;
$end = $len - 1;
while($start <= $end) {
$middle = intval(($start + $end)/2);
echo "start = ",$start," end = ",$end," middle = ",$middle,"<br/>";
if($arrData[$middle] == $val) {
return $middle;
} elseif ($arrData[$middle] > $val) {
$end = $middle - 1 ;
} elseif ($arrData[$middle] < $val) {
$start = $middle + 1;
}
}
return -1;
}
// test 1 Under the 2 Points method lookup
$arrData = array(1,2,3,4,5,7,8,9,11,23,56,100,104,578,1000);
echo binary_search($arrData,578),"<br/>";
echo binary_search($arrData,66),"<br/>";