如何将文件转换为关联数组？ 并使用前3个字符作为键

Question

I have a file like below, which I need to convert into an array:

ABCLine, Number, One
DEFNumber, Two, Line
GHIThree, Line, Number

I can get each line and turn it into a value of an array, but what I need to do is take the first 3 characters and turn that into a key and then the rest of the line into the value.

So my expected array would be:

Keys  |      Values
----------------------------
ABC   |  Line, Number, One
DEF   |  Number, Two, Line
GHI   |  Three, Line, Number

I honestly am not too sure where to begin, I've been looking all over and haven't been able to find a way to just take those first 3 characters and turn those into a key for the remainder of the line.

I started with some code, which looks like this:

<?php

  echo "Name<br/>";

  $file = "hw3.txt";
  $f1 = fopen($file, 'r');
  $array = array();


?>

Answer 1

This should work for you:

Get your file into an array with file(). Then walk through your array with array_walk() and take the first 3 characters of each value and add it to the $keys array. After that you can remove the first 3 characters from the value.

At the end just array_combine() your $keys array with $arr, e.g.

<?php


    $arr = file("file.txt", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    $keys = [];
    array_walk($arr, function(&$v, $k)use(&$keys){
       $keys[] = substr($v, 0, 3);
       $v = substr($v, 3);
    });     

    $arr = array_combine($keys, $arr);

    print_r($arr);

?>

output:

Array
(
    [ABC] => Line, Number, One
    [DEF] => Number, Two, Line
    [GHI] => Three, Line, Number
)