PHP append variable to the END of a specific line in file - php

Question

So I got the following function:
function searchWord($fileName, $str) {
$addthis = “string”;
$lines = file($fileName);
foreach ($lines as $lineNumber => $line) {
if (strpos($line, $str) !== false) {
$lines[$lineNumber] = $lines[$lineNumber].$addthis
file_put_contents($filename, implode($lines) . PHP_EOL);
break;
} else {
// do nothing
}
}
}
It searches for a specific string $str in a file $fileName. It then should add $addthis to the END (!!) of the line $lineNumber the $str was found on.
What the code does now is adding $addthis to the start of the line. I have searched the web but couldn't come up with a satisfying solution to my problem.

Answer 1

You need to remove the new line character from the end of your line before adding to it, then add a new line character back onto the end of it before writing back to the file. The updated line below should help.
$lines[$lineNumber] = trim($lines[$lineNumber]).$addthis.PHP_EOL;
Also, the write should happen after the loop.

Answer 2

Try this.
In my example, im using a text file called test.txt with these 3 lines on it:
apple
banana
cherry
Here's the PHP code.
<?php
// Search Function
function searchWord($fileName, $str, $addThis = 'string') {
if (file_exists($fileName)) {
$lines = file($fileName);
array_walk_recursive($lines, function(&$line) {
$line = trim($line);
});
foreach ($lines as $lineNo => $lineStr) {
if (false !== strpos($lineStr, $str)) {
$lines[$lineNo] = $lineStr . $addThis;
break;
}
}
file_put_contents($fileName, implode(PHP_EOL, $lines));
}
}
// Usage
searchWord('test.txt', 'banana', 'string');
?>
After the script is ran, the contents of test.txt is:
apple
bananastring
cherry
is this what you are after?