Php get value from text file

Question

I have this textfile:

foo: bar
el: macho
bing: bong
cake color: blue berry
mayo: ello

And I what I'm trying to accomplish is that if I "look" for foo, it returns bar (if I look for bing, it should return bong). A way a tried to accomplish this is first search though the file, return the line with the result, put it in a string and remove everything before the ":" and display the string.

// What to look for
$search = 'bing';
// Read from file
$lines = file('file.txt');
foreach($lines as $line)
{
    // Check if the line contains the string we're looking for, and print if it does
    if(strpos($line, $search) !== false)
        echo $line;

    $new_str = substr($line, ($pos = strpos($line, ',')) !== false ? $pos + 1 : 0);
} 
echo "<br>";
echo "bing should return bong:";
echo $new_str;

But it doesn't work. Up here is just one of the many things I've tried.

Sources: Many stackoverflow links on and comparable searches:
https://www.google.com/search?client=opera&q=php+remove+everything+after
https://www.google.com/search?client=opera&q=php+search+text+file+return+line

I've asked a question before, but the answers are to "professional" for me, I really need a noob-proof solution/answer. I've been trying to figure it out all day but I just can't get this to work.

Edit: It's solved! Thank you so much for your time & help, I hope this might be useful to someone else to!

Answer 1

This should work with what you are looking for, I tested it on my server and it seems to fit what you are looking for.

$lines_array = file("file.txt");
$search_string = "bing";

foreach($lines_array as $line) {
    if(strpos($line, $search_string) !== false) {
        list(, $new_str) = explode(":", $line);
        // If you don't want the space before the word bong, uncomment the following line.
        //$new_str = trim($new_str);
    }
}

echo $new_str;

?>