How to skip fwrite() for x lines - php

Question

I'm creating PHP program which should find in *.txt file line that starts with word "tak" and skip that program from rewriting it to the next *.txt file. So what I want to achieve now is prevent it from writing, for example, 2 more lines after line that started with "tak" word. Here is my CODE:
<?php
$file2 = fopen("out.txt", "w") or die("Unable to open file!");
$handle = fopen("plik.txt", "r");
if ($handle) {
while (($line = fgets($handle)) !== false) {
if (strpos($line, 'tak') === 0) {
echo 'found<br/>';
}
else {
fwrite($file2, $line);
}
}
fclose($handle);
echo 'OK';
}
else {
echo "can't read the file";
}
?>

Answer 1

I think using file, a for loop, and file_put_contents would work and be simpler.
$file2 = "out.txt";
//$file = file($file2) or die("Unable to open file!");
$file = array('asdf',
'asdf',
'asdf',
'tak',
'1',
'2',
'3',
'4');
file_put_contents($file2, ''); // truncate file;
for($i = 0; $i < count($file); $i++) {
$line = $file[$i];
if (strpos($line, 'tak') === 0) {
echo 'found<br/>';
$i = $i + 2;
} else {
// file_put_contents($file2, $line, FILE_APPEND | LOCK_EX);
echo $line;
}
echo 'ok';
}
Demo: https://eval.in/597694
Output (kinda messy but gets the point tak, 1, and 2 skipped):
asdfokasdfokasdfokfound<br/>ok3ok4ok

Answer 2

You can do it by keeping boolean and integer variable to count the number of occurrence. Like this,
<?php
$file2 = fopen("out.txt", "w") or die("Unable to open file!");
$handle = fopen("plik.txt", "r");
if ($handle) {
$stopWriteLines=false;
$max_line_skip=2;
// Taking above two variables for our logic.
while (($line = fgets($handle)) !== false) {
if($stopWriteLines) {
$max_line_skip--;
}
// Above condition check if we found tak in line then decrements the skip lines count.
if (strpos($line, 'tak') === 0) {
echo 'found<br/>';
$stopWriteLines=true; // Setting Boolean variable to skip writing lines.
}
else {
if(!$stopWriteLines) { // will write only if Boolean variable is set to true.
fwrite($file2, $line);
}
}
if($max_line_skip==0) {
$stopWriteLines=false;
}
// Above condition will make Boolean variable false after skipping 'n' lines.
}
fclose($handle);
echo 'OK';
}
else {
echo "can't read the file";
}
?>
Please check the explanations in code for better understanding of respected code sections.