<?php
/*------------------------------------------------------------------------------------------------------------------------------
Author: Qing Cui
Date: March 6, 2005
Version: 1.0
Description: This script is to do bulk search and replace string or regular expressions inside directory or file.
Usage: php search_replace.php dir_file_name pattern replacement [optional:file_type]
-------------------------------------------------------------------------------------------------------------------------------*/
if($argc<4)
{
  print "php search_replace.php dir_file_name pattern replacement [optional:file_type]\r\n";

  return;
}
$filename=$argv[1];
$pattern="/".ereg_replace("/","\/",$argv[2])."/";
$replacement=$argv[3];
if(trim($argv[4])!="")
{
  $filetypes=explode("|",strtolower($argv[4]));
}
$replace_all=false;

if(is_dir($filename))
{
  $dirname=realpath($filename);

  check_dir($dirname);
}
else if(is_file($filename))
{
  check_file($filename);
}
function check_dir($dirname)
{
  global $pattern;
  global $replacement;

  $dh=opendir($dirname);
	if(!$dh)
	{
	  print "Error to open dir $dirname.\r\n";
		return;
	}

	while(($filename=readdir($dh))!==false)
  {
    if($dirname[strlen($dirname)-1]!='/')
    {
      $new_file_name=$dirname."/".$filename;
      $local_dir=$dirname."/".".";
      $up_dir=$dirname."/"."..";
    }
    else
    {
      $new_file_name=$dirname.$filename;
      $local_dir=$dirname.".";
      $up_dir=$dirname."..";
    }

    if(is_dir($new_file_name) && $new_file_name!=$local_dir && $new_file_name!=$up_dir)
		{
		  check_dir($new_file_name);
		}
		else if(is_file($new_file_name))
		{
		  check_file($new_file_name);
		}
	}
	closedir($dh);
}
function check_file($filename)
{
  global $pattern;
  global $replacement;
  global $replace_all;
  global $filetypes;

  if(count($filetypes)>0)
  {
    $path=pathinfo($filename);
    if(!in_array($path['extension'],$filetypes))
    {
      return;
    }
  }
  /*
  $fp=fopen($filename,'r+w');
	if(!$fp)
	{
	  print "Error to read file.\r\n";
		return;
	}

	$content=fread($fp,filesize($filename));
	*/
  $content=file_get_contents($filename);

	$num_of_matched=preg_match_all($pattern,$content,$regs);

  if($num_of_matched)
	{
    if($replace_all==false)
    {
	    print "\r\nFound pattern in $filename, do you want to delete, y or n?";
		  fscanf(STDIN,"%c\n",$c);
		  if($c=='y')
		  {
		    //do_replace($fp,$content,$num_of_matched);
        do_replace($filename,$content,$num_of_matched);
		  }
      else if($c=='a')
      {
        $replace_all=true;
        //do_replace($fp,$content,$num_of_matched);
        do_replace($filename,$content,$num_of_matched);
      }
    }
    else
    {
      print "\r\nFound pattern in $filename, ";
      //do_replace($fp,$content,$num_of_matched);
      do_replace($filename,$content,$num_of_matched);
    }
	}
	//fclose($fp);
}
//function do_replace($fp,$content,$num_of_matched)
function do_replace($filename,$content,$num_of_matched)
{
  global $pattern;
  global $replacement;
  $content=preg_replace($pattern,$replacement,$content);
  /*ftruncate($fp,0);
  fseek($fp,0);
  if(fwrite($fp,$content)==false)
  {
    print "Error to write back file $filename.\r\n";
    fclose($fp);
    return;
  }*/
  file_put_contents($filename,$content);
  print " $num_of_matched Replaced \r\n";
}
?>