PHP - Read complete line from a position, strpos() - php

Question

How do I get the complete line from a position gotten by strpos()?
Here is my code:
//$route_route sample: NAXOP UZ45 VIKIK
$route_waypoint = explode(" ", $route_route);
$file = "components/airways.txt";
$contents = file_get_contents($file);
foreach ($route_waypoint as $waypoint) {
//$waypoint sample: NAXOP
$pos = strpos($contents, $waypoint);
if ($pos === false) {
continue;
} else {
$line = fgets($contents, $pos); // Here is my problem
//line sample: MES,W714,005,NAXOP,38.804139,30.546833,149,000, ,L
list($fix, $lat, $lon, $sample_data1, $sample_data2) = explode(',', $line);
echo "$fix, $lat, $lon";
}
}
The main objective is localize "NAXOP", read his complete line, and echo some data. Any kind of help is welcome!

Answer 1

DISCLAIMER: if VIKIK comes before NAXOP in $contents. VIKIK Will not be found, if there are multiple occurrences of NAXOP || UZ45 || VIKIK only the first of each occurrence will be found.
$len = strlen($contents);
$pos = 0;
foreach ($route_waypoint as $waypoint) {
$pos = strpos($contents, $waypoint, $pos);
if ($pos === false) {
continue;
}
else {
// Here is the critical section for matching the entire line:
// First look backwards from where $waypoint was found for the
// beginning of the line
$startOfLine = strrpos($contents, "\n", ($pos - $len));
// Next look forwards from $waypoint to find the end of the line
$endOfLine = strpos($contents, "\n", $pos);
// we already have the file in memory, just read from that,
$line = substr($contents, $startOfLine, ($endOfLine - $startOfLine));
list($fix, $lat, $lon, $sample_data1, $sample_data2)
= explode(',', trim($line));
echo "$fix, $lat, $lon";
// IDK if you want to match the same line twice or not.
$pos = $endOfLine;
}
}
Here is a better program.
<?php
$str = "NAXOP UZ45 VIKIK";
$regex = "/" . preg_replace("/ /", "|", $str) . "/";
$fp = fopen("test.dat", "r");
while ($line = fgets($fp)) {
if (preg_match($regex, $line)) {
echo $line;
}
}
fclose($fp);
Here is test.dat
NAXOP
UZ45
VIKIK
UZ45 VIKIK
NAXOP
SILLYSTRING
Here is the output
NAXOP
UZ45
VIKIK
UZ45 VIKIK
NAXOP

Answer 2

I've used this library in soo many programs.. check it out I think it'll solve exactly the problem you are having. It works exactly like it says..
e.g
between ('#', '.', 'biohazard#online.ge');
//returns 'online'
//from the first occurrence of '#'
src: http://php.net/manual/en/function.substr.php
<?php
function after ($this, $inthat)
{
if (!is_bool(strpos($inthat, $this)))
return substr($inthat, strpos($inthat,$this)+strlen($this));
};
function after_last ($this, $inthat)
{
if (!is_bool(strrevpos($inthat, $this)))
return substr($inthat, strrevpos($inthat, $this)+strlen($this));
};
function before ($this, $inthat)
{
return substr($inthat, 0, strpos($inthat, $this));
};
function before_last ($this, $inthat)
{
return substr($inthat, 0, strrevpos($inthat, $this));
};
function between ($this, $that, $inthat)
{
return before ($that, after($this, $inthat));
};
function between_last ($this, $that, $inthat)
{
return after_last($this, before_last($that, $inthat));
};
// use strrevpos function in case your php version does not include it
function strrevpos($instr, $needle)
{
$rev_pos = strpos (strrev($instr), strrev($needle));
if ($rev_pos===false) return false;
else return strlen($instr) - $rev_pos - strlen($needle);
};
?>