没有特殊字符的php文件搜索[重复]

Question

我正在尝试使用此代码执行 php 搜索：

$search = &q;
$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 '';

它搜索每个字符并且有时返回而没有结果。我想将此代码设置为仅搜索字母和数字，但不包含任何特殊字符，包括点和逗号。我该怎么做？ 谢谢。

Answer 1

基本：

// $search contains query
// remove non-alphanumeric characters from search query
$search = preg_replace('[^a-zA-Z\d\s:]','',$search); 

// Get unfiltered file into an array
$original_lines = file('file.txt');

$num_matches = 0;
foreach ($original_lines as $line) {

      if(strpos(preg_replace('[^a-zA-Z\d\s:]','',$line), $search) !== false){
         $num_matches++;
         echo $line;
      }
}

if (!$num_matches){
   echo "No matches.";
}

实验性的，可能内存和处理效率低下：

// $search contains query
// remove non-alphanumeric characters from search query
$search = preg_replace('[^a-zA-Z\d\s:]','',$search); 

// Get unfiltered file into an array
$original_lines = file('file.txt');

// Read entire file to string, filtering non-alphanumeric characters
$filtered_lines = preg_replace('[^a-zA-Z\d\s:]','',implode("\n",$original_lines); 

// Count the matches
if ($num_matches = preg_match_all($search,$filtered_lines,$matches)){

   // Convert back to array with replacements
   $filtered_lines = explode('\n',$filtered_lines); 

   $found_lines = 0; $line_index = -1;
   foreach ($filtered_lines as $fline) {

      $line_index++;

      if(strpos($fline, $search) !== false)
      {
         $found_lines++;

         echo $original_lines[$line_index];
      }

      if ($found_lines == $num_matches){
         break; // No more matches, so stop processing additional lines
      }
   }
}
else{
   echo "No matches...";
}