Get specific data from txt file - php

Question

I have txt file and I need to echo specific data in a loop.
Let's say my txt file name is this: myfile.txt
and the structure inside is like this:
etc="Orange" src="stack1"
etc="Blue" src="stack2"
etc="Green" src="stack3"
etc="Red" src="stack4"
How can I echo in PHP these values: Orange, Blue, Green, Red?

Answer 1

you can use preg_match_all for this:
<?php
# get your text
$txt = file_get_contents('your_text_file.txt');
# match against etc="" (gets val inside the quotes)
preg_match_all('/etc="([^"]+)"/', $txt, $matches);
# actual values = $matches[1]
$values = $matches[1];
echo '<pre>'. print_r($values, 1) .'</pre>';

Answer 2

$content = file_get_content("/path/to/myfile.txt", "r");
if (false === $content) {
// handle error if file can't be open or find
}
preg_match_all('/etc="(.*?)"/', $content, $matches);
echo implode($matches[1], ',');
With file_get_content you retrieve what's int he file.
After that you need to check if file_get_content has returned an error code (false in this case).
preg_match_all will use RegExp to filter out only what you need. In particular:
/ #is a delimiter needed
etc=" #will match literally the letters etc="
(.*?) #is a capturing group needed to collect all the values inside the "" part of etc value. So, capturing group is done with (). .* will match every character and ? make the quantifier "non greedy".
/ #is the ending delimiter
All matches are collected inside $matches array (is not necessary that $matches is previously defined.
Finally, you need to transform the collected values into a string and you can do this with implode function.

Answer 3

I exaplain all on code //comments.
<?php
$fichero = file_get_contents('./myfile.txt', false);
if($fichero === false){ //if file_get_contents() return false, the file isn't found, if its found, return data.
echo "Can't find file.\n";
}else{ //If file is find, this condition is executed.
$output = array(); //this variable is who will get the output of regular expression pattern from next line function.
preg_match_all('/([A-Z])\w+/',$fichero, $output);
for($i = 0; $i < count($output[0]); $i++){ //Iterate throught the first array inside of array of $output, count(array) is for get length of array.
echo $output[0][$i]; //Print values from array $output[0][$i]
if($i + 1 != count($output[0])){ //if not equal to length of array, add , at end of printed value of output[0][$i]
echo ', ';
}else{ //if equal to length of array, add . at end of printed value of $output[0][$i]
echo '.';
}
}
}
?>