PHP 在 txt 文件中搜索并回显整行

Question

使用 php，我尝试创建一个脚本，它将在文本文件中搜索并抓取整行并回显它。

我有一个标题为“numorder.txt”的文本文件 (.txt)，在该文本文件中，有几行数据，每 5 分钟就会有新行出现（使用 cron 作业）。数据看起来类似于：

2 aullah1
7 name
12 username

我将如何创建一个 php 脚本来搜索数据“aullah1”，然后抓取整行并回显它？ （一旦回显，它应该显示“2 aullah1”（不带引号）。

如果我没有清楚地解释任何内容和/或您希望我更详细地解释，请发表评论。

Answer 1

还有一个PHP示例，会显示多条匹配行：

<?php
$file = 'somefile.txt';
$searchfor = 'name';

// the following line prevents the browser from parsing this as HTML.
header('Content-Type: text/plain');

// get the file contents, assuming the file to be readable (and exist)
$contents = file_get_contents($file);

// escape special characters in the query
$pattern = preg_quote($searchfor, '/');

// finalise the regular expression, matching the whole line
$pattern = "/^.*$pattern.*\$/m";

// search, and store all matching occurences in $matches
if (preg_match_all($pattern, $contents, $matches))
{
   echo "Found matches:\n";
   echo implode("\n", $matches[0]);
}
else
{
   echo "No matches found";
}

Answer 2

这样做。这种方法可以让您搜索任意大小的文件（大文件不会使脚本崩溃），并将返回与您想要的字符串匹配的所有行。

<?php
$searchthis = "mystring";
$matches = array();

$handle = @fopen("path/to/inputfile.txt", "r");
if ($handle)
{
    while (!feof($handle))
    {
        $buffer = fgets($handle);
        if(strpos($buffer, $searchthis) !== FALSE)
            $matches[] = $buffer;
    }
    fclose($handle);
}

//show results:
print_r($matches);
?>

注意

strpos

与 !==

 运算符一起使用的方式。

Answer 3

使用

file()

和 strpos():

<?php
// What to look for
$search = 'foo';
// Read from file
$lines = file('file.txt');
foreach($lines as $line)
{
  // Check if the line contains the string we're looking for, and print if it does
  if(strpos($line, $search) !== false)
    echo $line;
}

对此文件进行测试时：

福扎

巴尔扎
abczah

它输出：

福扎

---

更新： 要在找不到文本时显示文本，请使用如下内容：

<?php
$search = 'foo';
$lines = file('file.txt');
// Store true when the text is found
$found = false;
foreach($lines as $line)
{
  if(strpos($line, $search) !== false)
  {
    $found = true;
    echo $line;
  }
}
// If the text was not found, show a message
if(!$found)
{
  echo 'No match found';
}

这里我使用

$found

 变量来查找是否找到匹配项。

Answer 4

$searchfor = $_GET['keyword'];
$file = 'users.txt';

$contents = file_get_contents($file);
$pattern = preg_quote($searchfor, '/');
$pattern = "/^.*$pattern.*\$/m";

if (preg_match_all($pattern, $contents, $matches)) {
    echo "Found matches:<br />";
    echo implode("<br />", $matches[0]);
} else {
    echo "No matches found";
    fclose ($file); 
}

Answer 5

看起来您最好将其系统化为

system("grep \"$QUERY\"")

，因为该脚本无论如何都不会具有特别高的性能。否则 

http://php.net/manual/en/function.file.php 向您展示如何循环行，您可以使用 http://php.net/manual/en/function.strstr.php用于查找匹配项。

Answer 6

单向...

$needle = "blah";
$content = file_get_contents('file.txt');
preg_match('~^(.*'.$needle.'.*)$~',$content,$line);
echo $line[1];

尽管使用 fopen() 和 fread() 逐行读取它并使用 strpos() 可能会更好

Answer 7

稍微修改了已投票答案的方法，以通过 GET 变量支持多个目录和变量关键字（如果您希望这样做）

if (isset($_GET["keyword"])){

   foreach(glob('*.php') as $file) { 

      $searchfor = $_GET["keyword"];
      
      // the following line prevents the browser from parsing this as HTML.
      header('Content-Type: text/plain');
      
      // get the file contents, assuming the file to be readable (and exist)
      $contents = file_get_contents($file);
      // escape special characters in the query
      $pattern = preg_quote($searchfor, '/');
      // finalise the regular expression, matching the whole line
      $pattern = "/^.*$pattern.*\$/m";
      // search, and store all matching occurences in $matches
      if(preg_match_all($pattern, $contents, $matches)){
         echo "Found matches:\n";
         echo $file. "\n";
         echo implode("\n", $matches[0]);
         echo "\n\n";
      }
      else{
      //  echo "No matches found";
      }
   }
}

Answer 8

<?php
// Specify the directory path where you want to search for .txt files.
$directory = '/path/to/your/folder/';

// Define the search text as a variable.
$searchText = 'sample';

// Open the directory for reading.
$dir = opendir($directory);

// Loop through the directory's contents.
while (false !== ($file = readdir($dir))) {
    // Check if the file has a .txt extension.
    if (pathinfo($file, PATHINFO_EXTENSION) === 'txt') {
        // Read the contents of the file.
        $content = file_get_contents($directory . $file);
        
        // Split the file content into an array of lines.
        $lines = explode("\n", $content);
        
        // Loop through each line and check if it contains the search text.
        foreach ($lines as $line) {
            if (strpos($line, $searchText) !== false) {
                echo "Matched line in file $file: $line\n";
            }
        }
    }
}

// Close the directory.
closedir($dir);
?>