Split a file with loads on classes into individual files. Uses namespace to figure out where in the file system to put them. Was useful for Microsofts bing api, and splitting files out of composer to autoload.

split_classes.php

<?php

# ini_set('memory_limit', '256M');

$directory = '/directory/where your php files are';
chdir($directory);

$files = glob($directory.'/*.php');

foreach($files as $file)
{
  $classes = array();
  $namespace = false;
  
  $fileContents = file_get_contents($file);

  $lines = explode("\r\n", $fileContents);
  $currentClass = '';
  $inClass = false;
  $className = '';
  $lastClassLine = 2;

  foreach($lines as $i => $line) {
    if (strpos($line, 'namespace') !== false) {
      $namespace = getNamespace($line);
    } else if ($line == '}') {
      $currentClass .= $line . PHP_EOL;
      $class = array(
        'name' => $className,
        'definition' => $currentClass,
      );

      $classes[] = $class;
      $currentClass = '';
      $inClass = false;
      $lastClassLine = $i;
    } else if (strpos($line, 'final class ') === 0 || strpos($line, 'class ') === 0) {
      $inClass = true;
      $currentClass = $line . PHP_EOL;
      $className = findClassname($line);

      if ($i > ($lastClassLine +2)) {
        $range = range($i-1, $lastClassLine + 2);
        foreach ($range as $number) {
          if ($lines[$number]) {
            $currentClass = $lines[$number] . PHP_EOL . $currentClass;
          }
        }
      }
    } else if ($inClass) {
      $currentClass .= $line . PHP_EOL;
    }
  }

  $folder = str_replace('\\', '/', $namespace);

  if (!file_exists($folder)) {
    mkdir($folder, 0755, true);
  }

  foreach($classes as $class) {
    makeFile($folder, $namespace, $class['name'], $class['definition']);
  }
}

function makeFile($folder, $namespace, $className, $classDefinition) {
  $class = '<?php

namespace ' . $namespace . ';

' . $classDefinition;

  file_put_contents($folder.'/'.$className . '.php', $class);
}

function findClassname($text)
{
#echo $text . PHP_EOL;
  if (preg_match('/class (.*)/', $text, $matches) == 1) {
    list($className) = explode(" ", $matches[1]);
    return $className;
  }

  return '';
}

function getNamespace($text)
{
  if (preg_match('/namespace (.*);/', $text, $matches) == 1) {
    return $matches[1];
  }
  
  return '';
}

This file should be easy to adapt for your specific case, but at the moment requires very well formatted classes.