php splitting a file into a multidimensional array

Question

I am needing a little help with splitting the contents of a file into a multidimensional array.

Sample of the file contents :

--[DEATH KNIGHT]--
--|Blood|--
--{Single}--
/* MACRO CODE FOR SINGLE TARGET */
--{MULTI}--
/* MACRO CODE FOR MULTIPLE TARGETS */
--|Frost|--
/* MACRO CODE FOR SINGLE TARGET */
--{MULTI}--
/* MACRO CODE FOR MULTIPLE TARGETS */
--{Single}--
--[DRUID]--
--|Guardian|--
--{Single}--
/* MACRO CODE FOR SINGLE TARGET */
--{Multi}--
/* MACRO CODE FOR MULTIPLE TARGETS */

I need to read this file and split it into an array with the following structure :

array(
  'DEATHKNIGHT' => array(
    'Blood' => array(
      'Single' = 'Single Target Macro Code',
      'Multi' = 'Multiple Target Macro Code'
      ),
    'Frost' => array(
      'Single' = 'Single Target Macro Code',
      'Multi' = 'Multiple Target Macro Code'
      )
  ),
  'DRUID' => array(
    'Guardian' => array(
      'Single' = 'Single Target Macro Code',
      'Multi' = 'Multiple Target Macro Code'
      )
)

I am using file_get_contents() to read the contents of the file into a string. I I am using preg_match_all() to pull out my defined array keys. The following are the regex that I am using:

$class_regex = '/(?:-{2})(?:\[)(?:[A-Z][\w]+)(?:[\s][A-Z][\w]+)?(?:\])(?:-{2})/';
$spec_regex = '/(?:-{2})(?:\|)(?:[A-Z][\w]+)(?:[\s][A-Z][\w]+)?(?:\|)(?:-{2})/i';
$target_regex = '/(?:-{2})(?:\{)(?:[A-Z][\w]+)(?:[\s][\(][\d][\D][\)])?(?:\})(?:-{2})/i';

I can pull out the keys successfully, and I can seperate the file into specific elements, but I am struggling when trying to create my array. Any help would be greatly appreciated. Thank you in advance.

Read it line by line with while ($line = fgets($file)) instead of reading the whole thing with file_get_contents(). — Barmar
– Barmar, Commented Mar 25, 2016 at 19:02
Are those 'target' keys Single and Multi static(constant) within your file content? — RomanPerekhrest
– RomanPerekhrest, Commented Mar 25, 2016 at 19:25
Yes, 'Single' and 'Multi' are static. everything else is not. The 'Macro Code' will vary in length. Meaning that each 'macro code' will cover a different amount of lines. — L-Train
– L-Train, Commented Mar 25, 2016 at 19:36

Andrew Shell · Accepted Answer · 2016-03-25 19:31:50Z

Like Barmar said you should go through it line by line using fgets instead of file_get_contents.

Here is an example script that does what you asked. You'll probably want to extend it with extra validation and such.

<?php
$parsed = array();
$handle = fopen("source.txt", "r");
if ($handle) {
    while (($line = fgets($handle, 4096)) !== false) {
        if (preg_match('/^--\[((?:[A-Z][\w]+)(?:[\s][A-Z][\w]+)?)\]--$/', $line, $match)) {
            $class = $match[1];
        } elseif (preg_match('/^--\|((?:[A-Z][\w]+)(?:[\s][A-Z][\w]+)?)\|--$/', $line, $match)) {
            $spec = $match[1];
        } elseif (preg_match('/^--\{((?:[A-Z][\w]+)(?:[\s][A-Z][\w]+)?)\}--$/', $line, $match)) {
            $target = $match[1];
        } else {
            if (isset($class) && isset($spec) && isset($target)) {
                if (empty($parsed[$class])) {
                    $parsed[$class] = array();
                }
                if (empty($parsed[$class][$spec])) {
                    $parsed[$class][$spec] = array();
                }
                if (empty($parsed[$class][$spec][$target])) {
                    $parsed[$class][$spec][$target] = '';
                }
                $parsed[$class][$spec][$target] .= $line;
            }
        }
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }
    fclose($handle);
}
echo print_r($parsed);

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