lynx: A Text Browser (Cont.)

The following interface demonstrates how to use lynx in PHP scripts. This interface searches the URL content for the lines containing the keyword.

Displaying the Lines in the URL Content Containing the Keyword

  URL:
 

  A keyword:
 





     
  Password:                    
http://undcemcs01.und.edu/~wen.chen.hu/course/515/2/Lynx.php 
<?php

# Remove leading and trailing spacing.
$URL     = trim( $_POST["URL"] );
$keyword = trim( $_POST["keyword"] );

# For security, remove some Unix metacharacters.
$meta    = array( ";", ">", ">>", ";", "*", "?", "&", "|" );
$URL     = str_replace( $meta, "", $URL );
$keyword = str_replace( $meta, "", $keyword );

if ( $_POST['act'] == "Search the URL content" ) {
  header( "Content-type: text/plain" );
  $cmd = "lynx -dump -source '" . $URL . "' > result.txt";
  echo  ( $cmd . "\n\n" );
  system( "chmod 777 result.txt ../2/" );
  system( $cmd );
  system( "chmod 755 result.txt ../2/" );
  $cmd = "grep  $keyword result.txt";
  echo  ( $cmd . "\n\n\n" );
  system( $cmd );
}

elseif ( $_POST["act"] == "Display the URL content" ) {
  header( "Content-type: text/plain" );
  $cmd = "lynx -dump -source '" . $URL . "' > result.txt";
  echo  ( $cmd . "\n\n\n" );
  system( "chmod 777 result.txt ../2/" );
  system( $cmd );
  system( "chmod 755 result.txt ../2/" );
  system( "cat result.txt" );
}

elseif ( $_POST["act"] == "Help" ) {
  header( "Content-type: text/html" );
  $file = fopen( "Help.html", "r" ) or
    exit( "Unable to open file!" );
  while ( !feof( $file ) )
    echo  fgets( $file );
  fclose( $file );
}

else {
  header( "Content-type: text/html" );
  echo( "<html><body>" );
  echo( "<h3>No such option: " . $_POST["act"] . "" );
  echo( "</body></html>" );
}

?>

The following PHP and Unix functions are used: