Help running PHP function on 1st word in a Pipe Delimited CSV file

I have a csv file that I want to run some php code on the first word in each line and add the result to the end of the line /save and repeat the process for all lines in the words.csv

Example Line with fat cat being the first word:
fat cat|black|2

words.csv
cat|black|2
dog|brown|3s
hot|cold|warm
mon|tues|weds

words.csv after running code for each
cat|black|2|result blah
dog|brown|3s|blah blah
hot|cold|warm|hello blah
mon|tues|weds|blah result blah

 

Not sure I quite understand what you're asking for, but this should get you going in the right direction:

$contents = file_get_contents('location/to/file.txt');

$contents = explode("\n", $contents); //may need to use \r instead of \n

$new_contents = '';
foreach($contents as $line)
{
	$new_contents .= "$line|result blah";
}

Code (markup):

 

foreach($contents as $line)
{
  $lineParts = array_map('trim', explode('|', $line));

  preg_match('#\s*(\w+)( *.*)#', $lineParts[0], $matches);

  $new_contents .= ;// create new line here

}

PHP:

Now $lineParts is the contents of each "column" in an array. $matches[1] is the first word in the first column and $matches[2] is everything after the first word, which could be empty.
Use these variables to reassemble the line as you wish.

If you want to save the results use fopen and fwrite to write the new results to the file.