Re: how to delete lines in a txt file using php.

M. Sokolewicz wrote:

babu wrote:

Hi i have a txt file like [SUBSTRAT] TYP=25x25_10 SUBSTRATNAME=S112 PIXEL=5 OPERATOR=Zi KOMMENTAR=dunkel INTENSITAET=1000.000000 [MESSUNG] DATUM=03.01.2005 UHRZEIT=11:22 MESSUNG=SWEEP_UI i want to delete lines which start with '[' and 'TYP'. i have multiple such files.i have used strstr method. i have written code for it, but it results in deletion of complete data from files. Can anyone check where the logic goes wrong. here is my file. <? $del_lines=array("[","TYP","P_MPP","I_MPP","V_MPP","T=","FIT","INTENSITAET"); $dir=getcwd(); $handle = opendir($dir); while (false !== ($file = readdir($handle))) { if ((preg_match('/^2005\d{4}_\d{4}\.txt$/', $file))||(preg_match('/^2005\d{4}_\d{4}\_01_01\.txt$/',$file))){

     $fc=file($file);
     $f=fopen($file,"w");
     foreach($fc as $line){
      $bool=TRUE;
     for($i=0;$i<sizeof($del_lines);$i++){
          if(!strstr($line,$del_lines[$i])){
            $bool=FALSE;}
             break;
           //fputs($f,$line);
        }
    //if($bool){fputs($f,$line);}

} if($bool){fputs($f,$line);} fclose($f);

    } }

closedir($handle); ?>

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wouldn't something like this work (faster): <?php $deleteLines = [...]

Actually, I see I've made a small mistake in that script, here's an updated one: <?php $deleteLines = array("[","TYP","P_MPP","I_MPP","V_MPP","T=","FIT","INTENSITAET"); if($handle = opendir('.')) {

    while(($file = readdir($handle)) !== false) {
        // init vars
        $contents = '';

        if (!(preg_match('/^2005\d{4}_\d{4}\.txt$/', $file) || preg_match('/^2005\d{4}_\d{4}\_01_01\.txt$/',$file))){
            // the filename has been rejected; move on to the next one
            continue;
        }

        // right, we need to open the file now so we can delete the lines
        $contents    = file($file);
        $stream        = fopen($file, 'w');

        // loop trough the file, examining each line
        foreach($contents as $line=>data) {
        		$clearLine = false;
            foreach($deleteLines as $delete) {
                if(0 === strpos($data, $delete)) {
                    // string starts with one of the ToBeDeleted parts
                    $clearLine = true;
                }
            }
            if(!$clearLine) {
            	fwrite($stream, $data, strlen($data));
            }
        }

        fclose($stream);
    }

} closedir($handle); ?>