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SEARCH CODE

Search and Replace class
By: Codewalkers
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    2002-04-26

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    Class to enable search/replace of files. Can perform the search over one file, multiple files, entire directories with/without subdirectories. Can search using four different search functions, supporting ereg and preg regular expressions. Website

    By : Matt

    <?php
    /***************************************
    ** Title........: Search and replace utility
    ** Filename.....: search.replace.php
    ** Author.......: Richard Heyes
    ** Version......: 1.0
    ** Notes........:
    ** Last changed.: 09/09/2000
    ** Last change..:
    ***************************************/

    class search_replace{

    var $find;
    var $replace;
    var $files;
    var $directories;
    var $include_subdir;
    var $ignore_lines;
    var $ignore_sep;
    var $occurences;
    var $search_function;
    var $last_error;

    /***************************************
    ** Constructor function. Sets up the
    ** above functions.
    ***************************************/
    function search_replace($find, $replace, $files, $directories = '', $include_subdir = 1, $ignore_lines = array()){

    $this->find = $find;
    $this->replace = $replace;
    $this->files = $files;
    $this->directories = $directories;
    $this->include_subdir = $include_subdir;
    $this->ignore_lines = $ignore_lines;

    $this->occurences = 0;
    $this->search_function = 'search';
    $this->last_error = '';

    }

    /***************************************
    ** Accessor for retrieving occurences.
    ***************************************/
    function get_num_occurences(){
    return $this->occurences;
    }

    /***************************************
    ** Accessor for retrieving last error.
    ***************************************/
    function get_last_error(){
    return $this->last_error;
    }

    /***************************************
    ** Accessor for setting find variable.
    ***************************************/
    function set_find($find){
    $this->find = $find;
    }

    /***************************************
    ** Accessor for setting replace variable.
    ***************************************/
    function set_replace($replace){
    $this->replace = $replace;
    }

    /***************************************
    ** Accessor for setting files variable.
    ***************************************/
    function set_files($files){
    $this->files = $files;
    }

    /***************************************
    ** Accessor for setting directories variable.
    ***************************************/
    function set_directories($directories){
    $this->directories = $directories;
    }

    /***************************************
    ** Accessor for setting include_subdir variable.
    ***************************************/
    function set_include_subdir($include_subdir){
    $this->include_subdir = $include_subdir;
    }

    /***************************************
    ** Accessor for setting ignore_lines variable.
    ***************************************/
    function set_ignore_lines($ignore_lines){
    $this->ignore_lines = $ignore_lines;
    }

    /***************************************
    ** Function to determine which search
    ** function is used.
    ***************************************/
    function set_search_function($search_function){
    switch($search_function){
    case 'normal': $this->search_function = 'search';
    return TRUE;
    break;

    case 'quick' : $this->search_function = 'quick_search';
    return TRUE;
    break;

    case 'preg' : $this->search_function = 'preg_search';
    return TRUE;
    break;

    case 'ereg' : $this->search_function = 'ereg_search';
    return TRUE;
    break;

    default : $this->last_error = 'Invalid search function specified';
    return FALSE;
    break;
    }
    }


    /***************************************
    ** The main search and replace routine.
    ** Private function - DO NOT CALL!
    ***************************************/
    function search($filename){

    $occurences = 0;
    $file_array = file($filename);

    for($i=0; $i<count($file_array); $i++){

    if(count($this->ignore_lines) > 0){
    for($j=0; $j<count($this->ignore_lines); $j++){
    if(substr($file_array[$i],0,strlen($this->ignore_lines[$j])) == $this->ignore_lines[$j]) continue 2;
    }
    }

    $occurences += count(explode($this->find, $file_array[$i])) - 1;
    $file_array[$i] = str_replace($this->find, $this->replace, $file_array[$i]);
    }
    if($occurences > 0) $return = array($occurences, implode('', $file_array)); else $return = FALSE;
    return $return;

    }

    /***************************************
    ** The quick search function. Does not
    ** support the ignore_lines feature.
    ***************************************/
    function quick_search($filename){

    clearstatcache();

    $file = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);
    $occurences = count(explode($this->find, $file)) - 1;
    $file = str_replace($this->find, $this->replace, $file);

    if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;
    return $return;

    }

    /***************************************
    ** The preg search function. Does not
    ** support the ignore_lines feature.
    ***************************************/
    function preg_search($filename){

    clearstatcache();

    $file = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);
    $occurences = count($matches = preg_split($this->find, $file)) - 1;
    $file = preg_replace($this->find, $this->replace, $file);

    if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;
    return $return;

    }

    /***************************************
    ** The ereg search function. Does not
    ** support the ignore_lines feature.
    ***************************************/
    function ereg_search($filename){

    clearstatcache();

    $file = fread($fp = fopen($filename, 'r'), filesize($filename)); fclose($fp);

    $occurences = count($matches = split($this->find, $file)) -1;
    $file = ereg_replace($this->find, $this->replace, $file);

    if($occurences > 0) $return = array($occurences, $file); else $return = FALSE;
    return $return;

    }

    /***************************************
    ** Function for writing out a new file.
    ***************************************/
    function writeout($filename, $contents){

    if($fp = @fopen($filename, 'w')){
    flock($fp,2);
    fwrite($fp, $contents);
    flock($fp,3);
    fclose($fp);
    }else{
    $this->last_error = 'Could not open file: '.$filename;
    }

    }

    /***************************************
    ** Internal function called by do_search()
    ** to sort out any files that need searching.
    ***************************************/
    function do_files($ser_func){
    if(!is_array($this->files)) $this->files = explode(',', $this->files);
    for($i=0; $i<count($this->files); $i++){
    if($this->files[$i] == '.' OR $this->files[$i] == '..') continue;
    if(is_dir($this->files[$i]) == TRUE) continue;
    $newfile = $this->$ser_func($this->files[$i]);
    if(is_array($newfile) == TRUE){
    $this->writeout($this->files[$i], $newfile[1]);
    $this->occurences += $newfile[0];
    }
    }
    }

    /***************************************
    ** Internal function called by do_search()
    ** to sort out any dirs that need searching.
    ***************************************/
    function do_directories($ser_func){
    if(!is_array($this->directories)) $this->directories = explode(',', $this->directories);
    for($i=0; $i<count($this->directories); $i++){
    $dh = opendir($this->directories[$i]);
    while($file = readdir($dh)){
    if($file == '.' OR $file == '..') continue;

    if(is_dir($this->directories[$i].$file) == TRUE){
    if($this->include_subdir == 1){
    $this->directories[] = $this->directories[$i].$file.'/';
    continue;
    }else{
    continue;
    }
    }

    $newfile = $this->$ser_func($this->directories[$i].$file);
    if(is_array($newfile) == TRUE){
    $this->writeout($this->directories[$i].$file, $newfile[1]);
    $this->occurences += $newfile[0];
    }
    }
    }
    }

    /***************************************
    ** This starts the search/replace off.
    ** Call this to do the search.
    ** First do whatever files are specified,
    ** and/or if directories are specified,
    ** do those too.
    ***************************************/
    function do_search(){
    if($this->find != ''){
    if((is_array($this->files) AND count($this->files) > 0) OR $this->files != '') $this->do_files($this->search_function);
    if($this->directories != '') $this->do_directories($this->search_function);
    }
    }

    } // End of class
    ?>

    <?php
    /***************************************
    ** Title........: Search and Replace class
    ** Filename.....: example.php
    ** Author.......: Richard Heyes
    ** Version......: See script
    ** Notes........:
    ** Last changed.: 10/09/2000
    ** Last change..:
    ***************************************/

    include('class.search_replace.inc');

    /***************************************
    ** Create the object, set the search
    ** function and run it. Then change the
    ** pattern to find something else, and
    ** re-run the search.
    ***************************************/

    $sr = new file_search_replace('test', 'Replaced!', array('test.txt'), '', 1, array('##'));

    /***************************************
    ** Following function not necessary as
    ** normal is the default, but here to
    ** illustrate it.
    ***************************************/
    $sr->set_search_function('normal');

    $sr->do_search();
    $sr->set_find('another');
    $sr->do_search();

    /***************************************
    ** Some ouput purely for the example.
    ***************************************/
    header('Content-Type: text/plain');
    echo 'Number of occurences found: '.$sr->get_num_occurences()."\r\n";
    echo 'Error message.............: '.$sr->get_last_error()."\r\n";

    ?>

    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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