Php method for obtaining X rules for example AAAAXAAAA

As for this problem, I have just slightly modified my program, now the answer is out, please which PHP Daniel help me optimize my code structure! Thank you! Original article: http://www.oschina.net/code/snippet_192190_16605 /** * * @author Cold Cloud * @param Sina Weibo http://weibo.com/130326007 */ function Getlower ($data) { $length = strlen ($data)-1; $str = "; for ($i =0; $i < $length; $i + +) { $flag = true; if (!isupper ($data [$i])) {//is currently lowercase if ($i = = 3) { $flag = Getflag ($data, $i); If the fourth one is capitalized, it's not true. if (Isupper ($data [$i +4])) { $flag = false; } }else if ($i = = $length-3) { $flag = Getflag ($data, $i); If the first fourth is not capitalized if (Isupper ($data [$i-4])) { $flag = false; } }else if ($i >3 && $i < $length-3) { $flag = Getflag ($data, $i); If the former | | After the fourth one is capitalized, it's not tenable. if (Isupper ($data [$i +4]) | | isupper ($data [$i-4])) { $flag = false; } }else{ $flag = false; } if ($flag) { @ $str. = $data [$i]; } } } return $str; } The first three and three of the public current characters function Getflag ($data, $i) { $flag = true; for ($j = $i-3; $j <= $i +3; $j + +) { if ($j! = $i) { If one is lowercase, it's not true. if (!isupper ($data [$j])) { $flag = false; } } } return $flag; } /** * * Determine if it is an uppercase letter */ function Isupper ($s) { if (@ord ($s) < 97) { return true; }else{ return false; } } $res = "; $handle = fopen ("./input.txt", ' R '); $d = Fread ($handle, FileSize ("./input.txt")); $res = Getlower (Str_replace ("\ r \ n", "", $d)); /*while (!feof ($handle)) {//Progressive Read method $buffer = Fgets ($handle, 4096); $res. = Getlower ($buffer); }*/ Echo $res; Fclose ($handle); ?> Copy Code

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