note 27450 added to function.fgets
| From: | Bijan at rack1 dot php dot net | Date: | Fri, 06 Dec 2002 10:44:25 +0000 |
| Subject: | note 27450 added to function.fgets | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-40414@lists.php.net to get a copy of this message | ||
Here's a class that I wrote for highlighting a desiered word inside a text file. It also
doesn't have the problem that the first posts discussed about ( using fgets without considering
a big line that falls out of your range might split a query word and you do not find it anymore)
[pre]
class findWord
{
var $fileName;
var $queryWord;
var $color; # The color of queryWord in output.
var $fp; # file pointer.
var $lines = array();
var $Output;
var $buffSize; # The size of buffer.
function findWord( $fileName, $queryWord, $color = "red", $buffSize = 1024)
{
if ( file_exists($fileName) )
{
$this->fileName = $fileName;
$this->fp = fopen($this->fileName, "r");
$this->queryWord = $queryWord;
$this->color = $color;
$this->buffSize = $buffSize;
$this->lines = $this->readLines( $this->fp, $this->buffSize);
$this->Output = $this->queryLines( $this->lines, $this->queryWord, $this->color);
$this->showFile( $this->Output);
}
else
{
die("Program dies : Invalid file name.");
}
}
function readLines( $fp, $buffSize)
{
# This little line saves the program when a word is at the
# junction between two chunks, i.e. if a word doesn't fit
# in one line and fgets reaches its length sooner than the
# CR and it breaks the line in the middle of our queryWord.
#$buffSize += $buffSize - ( strlen($this->queryWord) - 1 );
$lines = array();
$count = 0;
while ( !feof( $fp) )
{
$lines[$count] = fgets( $fp, $buffSize);
if ( $count != 0 )
{
$temp = $lines[$count-1];
if ( strlen($temp) >= $buffSize-1 &&
$temp[strlen($temp)-1] != "\n"
)
{
$lines[$count-1] .= $lines[$count];
# coz when we increment $count below, it actually doesn't get incremented!
--$count;
}
}
$count++;
}
return $lines;
}
function queryLines( $lines, $queryWord, $color)
{
foreach ( $lines as $key => $val)
{
$holder = explode( $queryWord, $val);
$lines[$key] = implode( "<font color=$color>$queryWord</font>", $holder);
}
return $lines;
}
function showFile( $outPut)
{
foreach ( $outPut as $val)
print "$val <br>";
}
}
# An example instantiation of this class, note that the buffSize
# isn't important anymore, since by pasting all the returned
# strings of fgets together till we find each line exactly ( not
# the chunks that fgets make if the buffSize be less than a line
# length ), we can populate our array by lines and then search
# each slut! for the queryWord.
$ourFile = new findWord("search.txt", "hello", "blue", 5);
[/pre]
--
http://www.php.net/manual/en/function.fgets.php
http://master.php.net/manage/user-notes.php?action=edit+27450
http://master.php.net/manage/user-notes.php?action=delete+27450
http://master.php.net/manage/user-notes.php?action=reject+27450