PHP文件操作之，插入某行，刪除某行，獲取行號

 1 #在需要查找的內容后一行新起一行插入內容
 2     function insertAfterTarget($filePath, $insertCont, $target)
 3     {
 4         $result = null;
 5         $fileCont = file_get_contents($filePath);
 6         $targetIndex = strpos($fileCont, $target); #查找目標字符串的坐標
 7 
 8         if ($targetIndex !== false) {
 9             #找到target的后一個換行符
10             $chLineIndex = strpos(substr($fileCont, $targetIndex), "\n") + $targetIndex;
11             if ($chLineIndex !== false) {
12                 #插入需要插入的內容
13                 $result = substr($fileCont, 0, $chLineIndex + 1) . $insertCont . "\n" . substr($fileCont, $chLineIndex + 1);
14                 $fp = fopen($filePath, "w+");
15                 fwrite($fp, $result);
16                 fclose($fp);
17             }
18         }
19     }
20 
21     #刪除內容所在的某一行
22     function delTargetLine($filePath, $target)
23     {
24         $result = null;
25         $fileCont = file_get_contents($filePath);
26         $targetIndex = strpos($fileCont, $target); #查找目標字符串的坐標
27 
28         if ($targetIndex !== false) {
29             #找到target的前一個換行符
30             $preChLineIndex = strrpos(substr($fileCont, 0, $targetIndex + 1), "\n");
31             #找到target的后一個換行符
32             $AfterChLineIndex = strpos(substr($fileCont, $targetIndex), "\n") + $targetIndex;
33             if ($preChLineIndex !== false && $AfterChLineIndex !== false) {
34                 #重新寫入刪掉指定行后的內容
35                 $result = substr($fileCont, 0, $preChLineIndex + 1) . substr($fileCont, $AfterChLineIndex + 1);
36                 $fp = fopen($filePath, "w+");
37                 fwrite($fp, $result);
38                 fclose($fp);
39             }
40         }
41     }
42 
43     #獲取某段內容的行號
44     /**
45      * @param $filePath
46      * @param $target   待查找字段
47      * @param bool $first   是否再匹配到第一個字段后退出
48      * @return array
49      */
50     function getLineNum($filePath, $target, $first = false)
51     {
52         $fp = fopen($filePath, "r");
53         $lineNumArr = array();
54         $lineNum = 0;
55         while (!feof($fp)) {
56             $lineNum++;
57             $lineCont = fgets($fp);
58             if (strstr($lineCont, $target)) {
59                 if($first) {
60                     return $lineNum;
61                 } else {
62                     $lineNumArr[] = $lineNum;
63                 }
64             }
65         }
66         return $lineNumArr;
67     }