Code Examples -> a routine to process a large string or text-file line by line.

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PHP Code Examples

Title :	a routine to process a large string or text-file line by line.
Categories :	PHP, Strings, Filesystem	Moe Coder
Date :	Oct 22nd 2005
Grade :	1 of 5 (graded 1 times)
Viewed :	4975
File :	4239.php
Images :	No Images for this code example.

Search :	More code by Moe Coder
Action :	Grade This Code Example
Tools :	My Examples List

Code

[code]
<?php
#get_line.inc.php
#This include file provides a routine to process a large string or text-file line by line.
#(Example included) Only two parameters are needed: the string variable to be processed and an #integer variable to keep the position in the string.
#
# Usage Note:
# Call this function with "&" preceeding each parameter to
# pass parameters by reference which will:
# 1) conserve memory (especially for the string data)
# 2) allow the function to maintain the position variable
#
function get_line($strBigString, $nStartPos) {
if ($nStartPos < strlen($strBigString)) {
$nCRpos = strpos($strBigString,"\n",$nStartPos);
if ($nCRpos !== FALSE) {
$sResult = substr($strBigString,$nStartPos,$nCRpos-$nStartPos);
} else {
# grab what's left of the string
$sResult = substr($strBigString,$nStartPos);
}
$nStartPos += strlen($sResult)+1;
} else {
$sResult = FALSE; # signal end-of-data to calling function
}
return $sResult;
}

/* ##########################################################
#
# An example of how to apply this function:
#
$strBigLongStr = file_get_contents("somefile.dat");

include_once("get_line.inc.php");

$nCurPos = $nLineCtr = 0;

while (($strLil = get_line(&$strBigLongStr,&$nCurPos)) !== FALSE) {
echo ++$nLineCtr . " $strLil" . "~\n";
}
########################################################## */

?>
[code]

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User Comments

	Joseph Crawford wrote :1360 This is a nice function but why make things complex? <?php $lines = file(`/path/to/file`); foreach($lines as $num => $line) { echo ($num+1).`.) `.$line.`<br>`; } $lines = null; ?> as far as i can see that will do the same thing.