}
/**
* @todo kmp算法查找字符串
* @param string @string 目标串
* @param string @pattern 模式串
* @author houweizong@gmail.com
* **/
function kmp($string, $pattern)
{
$next = array();
findNextVal($pattern, $next);
$ml = strlen($string);
$pl = strlen($pattern);
$i = 0;
$j = 0;
while ($i < $ml - $pl) {
while ($j == 0 || $j < $pl && $string[$i] == $pattern[$j]) {
$i++;
$j++;
}
if ($j == $pl) {
return $i - $pl;
}
$j = $next[$j];
}
return -1;
}
$pattern = 'abshhh';
$string = 'sssssssssssssssssssababababshhabhshhhabshhhabsabsabs';
$s = kmp($string, $pattern);
var_dump($s);
<?php
function kmp($arr)
{
$len = strlen($arr);
$k = 0;
$next[0] = 0;
for ($i = 1; $i < $len; $i++) {
if ($k > 0 && $arr[$i] != $arr[$k]) {
$k = $next[$k - 1];
}
if ($arr[$i] == $arr[$k]) {
$k++;
}
$next[$i] = $k;
}
return $next;
}
$arr = 'ababaab';
$arr = kmp($arr);
print_r($arr);
