PHP实现的字符串匹配算法示例【sunday算法】_php技巧_

= $text_len) return false; $i = 0; for($i = 0; $i < $pattern_len; $i++){ //组装以pattern中的字符为下标的数组 $shift[$pattern[$i]] = $pattern_len - $i; } while($i <= $text_len - $pattern_len){ $nums = 0; //匹配上的字符个数 while($pattern[$nums] == $text[$i + $nums]){ $nums++; if($nums == $pattern_len){ return "The first match index is $i\n"; } } if($i + $pattern_len < $text_len && isset($shift[$text[$i + $pattern_len]])){ //判断模式串后一位字符是否在模式串中 $i += $shift[$text[$i + $pattern_len]]; //对齐该字符 }else{ $i += $pattern_len; //直接滑动pattern_len位 } } } $text = "I am testing mySunday on sunday!"; $pattern = "sunday"; echo mySunday($pattern,$text); 

 The first match index is 25