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Breaking up a data file

Posted on 2009-05-05
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Last Modified: 2012-05-06
I am trying to write a php script that will read in a text based data file. Find the start of the first set of data and the End of the first set. Then make the changes that it needs to make, move the changed data to another var, and then go to the next set of data and then add append that data to the first set of data and repeat till the end of the file.

Below is an example of the data format. The data is separated by 3 blank lines. If i break the data into separate parts, I can do what I want.  But I need to read it as one file.

Any suggestions on the best way to do this?  Thanks!
startdata
data
data
data
data
enddata
 
 
startline
data
data
data
data
data
endline
 
 
startline
data
data
data
endline

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Question by:cPokey
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bljak earned 250 total points
ID: 24311881
Am i understanding you right?
You are having always chunks of data, which are separated by 3 (not 2 like in your example) empty lines.
Lets say your file looks like this:

------- start of file ----------
aaaaaaaaa
bbbbbbbbb
ccccccccc



ddddddddd
eeeeeeeee
fffffffffffff
gggggggg



hhhhhhhhh
iiiiiiiiiiiiiiiiiiiiiiiii
------- end of file  ----------

Then, you want it to do something like this:

Open file, read data until end of first chunk has been reached, assign it to a variable, do something with that (maybe also assign changed stuff to another variable) and then move on.
And process would look like this:
You start doing it, then first time you reach 3 blank lines, you have variable called $tmp which looks liek this:
$tmp = "aaaaaaaaa
bbbbbbbbb
ccccccccc"

Then you might do something with that, whatever, and when you are done, you keep moving to the next chunk which then looks like this:
$tmp = "ddddddddd
eeeeeeeee
fffffffffffff
gggggggg"

Again, you do whatever you want with it, change it however you want it and move on again, and then you have reached end of file and have $tmp looking like this:

$tmp = "hhhhhhhhh
iiiiiiiiiiiiiiiiiiiiiiiii"

If this is what you want, look down at the code, function "myFunc" is your function to change received chunk to whatever you want and assign it wherever you want.



<?php
 
$globalVar = "";
 
function myFunc($str)
{
	global $globalVar;
	$globalVar .= $str;
}
 
function SplitFileToChunks($filePath)
{
	$tmp = "";
	
	if ( ($fh = fopen($filePath, "r")) !== FALSE )
	{
		$endChunk = false;
		$emptyLineCnt = 0;
		
		while ( !feof($fh) )
		{
			$fileLine = fgets($fh);
			$tmpFileLine = trim($fileLine);
			
			if ( empty($tmpFileLine) )
			{
				$emptyLineCnt++;
			}
			
			$tmp .= $fileLine;
			
			if ( $emptyLineCnt == 3 )
			{
				$emptyLineCnt = 0;
				$tmp = trim($tmp); //this will also trim last CR/LF, if you want it, then uncomment next line
				//$tmp .= "\r\n";
				
				myFunc($tmp);
				
				$tmp = "";
			}
		}
		
		$tmp = trim($tmp);
		
		if ( !empty($tmp) )
		{
			myFunc($tmp);
		}
		
		fclose($fh);		
	}
}
 
SplitFileToChunks("<path to your file>");
 
var_dump($globalVar);
 
?>

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Author Comment

by:cPokey
ID: 24315241
Works Great.  Thank you!
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Author Closing Comment

by:cPokey
ID: 31578177
Works Great! Thank you.
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