<?php
// fedora-centos-apache-php-cannot-write-delete-file
// getsebool -a|grep httpd
// httpd_unified --> off
// setsebool -P httpd_unified 1

replaceTarget("test.txt", "aaaaaaaaaaaaaaaaa", "AAAAA");
//unlink("test.txt");

#替換指定字串
function replaceTarget($filePath, $replaceCont, $target)
{
    $result = null;
    $fileCont = file_get_contents($filePath);
    $targetIndex = strpos($fileCont, $target); #查詢目標字串的座標

    if ($targetIndex !== false) {
        #找到target的前一個換行符
        $preChLineIndex = strrpos(substr($fileCont, 0, $targetIndex + 1), "\n");
        #找到target的後一個換行符
        $AfterChLineIndex = strpos(substr($fileCont, $targetIndex), "\n") + $targetIndex;
        if ($preChLineIndex !== false && $AfterChLineIndex !== false) {
            #刪掉指定行，插入新內容
            $result = substr($fileCont, 0, $preChLineIndex + 1) . $replaceCont . "\n" . substr($fileCont, $AfterChLineIndex + 1);
            file_put_contents($filePath, $result);
            //$fp = fopen($filePath, "w+");
            //fwrite($fp, $result);
            //fclose($fp);
        }
    }
}

#在需要查詢的內容後一行新起一行插入內容
function insertAfterTarget($filePath, $insertCont, $target)
{
    $result = null;
    $fileCont = file_get_contents($filePath);
    $targetIndex = strpos($fileCont, $target); #查詢目標字串的座標

    if ($targetIndex !== false) {
        #找到target的後一個換行符
        $chLineIndex = strpos(substr($fileCont, $targetIndex), "\n") + $targetIndex;
        if ($chLineIndex !== false) {
            #插入需要插入的內容
            $result = substr($fileCont, 0, $chLineIndex + 1) . $insertCont . "\n" . substr($fileCont, $chLineIndex + 1);
            file_put_contents($filePath, $result);
            //$fp = fopen($filePath, "w+");
            //fwrite($fp, $result);
            //fclose($fp);
        }
    }
}

#刪除內容所在的某一行
function delTargetLine($filePath, $target)
{
    $result = null;
    $fileCont = file_get_contents($filePath);
    $targetIndex = strpos($fileCont, $target); #查詢目標字串的座標

    if ($targetIndex !== false) {
        #找到target的前一個換行符
        $preChLineIndex = strrpos(substr($fileCont, 0, $targetIndex + 1), "\n");
        #找到target的後一個換行符
        $AfterChLineIndex = strpos(substr($fileCont, $targetIndex), "\n") + $targetIndex;
        if ($preChLineIndex !== false && $AfterChLineIndex !== false) {
            #重新寫入刪掉指定行後的內容
            $result = substr($fileCont, 0, $preChLineIndex + 1) . substr($fileCont, $AfterChLineIndex + 1);
            file_put_contents($filePath, $result);
            //$fp = fopen($filePath, "w+");
            //fwrite($fp, $result);
            //fclose($fp);
        }
    }
}

#獲取某段內容的行號
/**
 * @param $filePath
 * @param $target   待查詢欄位
 * @param bool $first   是否再匹配到第一個欄位後退出
 * @return array
 */
function getLineNum($filePath, $target, $first = false)
{
    $fp = fopen($filePath, "r");
    $lineNumArr = array();
    $lineNum = 0;
    while (!feof($fp)) {
        $lineNum++;
        $lineCont = fgets($fp);
        if (strstr($lineCont, $target)) {
            if($first) {
                return $lineNum;
            } else {
                $lineNumArr[] = $lineNum;
            }
        }
    }
    return $lineNumArr;
}

?>