BitOne · tstarling · Oct 8, 2021
diff --git a/analyzer/src/BitOne/PhpMemInfo/Analyzer/StdClassShapesCollector.php b/analyzer/src/BitOne/PhpMemInfo/Analyzer/StdClassShapesCollector.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace BitOne\PhpMemInfo\Analyzer;
+
+class StdClassShapesCollector
+{
+    /** @var array */
+    protected $items;
+
+    /**
+     * @param array $items
+     */
+    public function __construct(array $items)
+    {
+        $this->items = $items;
+    }
+
+    /**
+     * Create a summary from the existing items,
+     * aggregated by member list and sorted by count.
+     *
+     * @return array
+     */
+    public function collect()
+    {
+        $summary = [];
+
+        foreach ($this->items as $item) {
+            if ( $item['type'] !== 'object' || $item['class'] !== 'stdClass') {
+                continue;
+            }
+            $shape = implode(',', array_keys($item['children'] ?? []));
+            if (!isset($summary[$shape])) {
+                $summary[$shape] = ['count' => 0, 'self_size' => 0];
+            }
+            $summary[$shape]['count']++;
+            $summary[$shape]['self_size']+= $item['size'];
+        }
+
+        uasort($summary, function ($a, $b) {
+            if ($a === $b) {
+                return 0;
+            }
+            if ($a['count'] > $b['count']) {
+                return -1;
+            } else {
+                return 1;
+            }
+        }
+        );
+
+        return $summary;
+    }
+}
diff --git a/analyzer/src/BitOne/PhpMemInfo/Console/Application.php b/analyzer/src/BitOne/PhpMemInfo/Console/Application.php
@@ -7,6 +7,7 @@
 use BitOne\PhpMemInfo\Console\Command\SummaryCommand;
 use BitOne\PhpMemInfo\Console\Command\TopChildrenCommand;
 use BitOne\PhpMemInfo\Console\Command\TopSizeCommand;
+use BitOne\PhpMemInfo\Console\Command\StdClassShapesCommand;
 use Symfony\Component\Console\Application as BaseApplication;
 
 /**
@@ -24,5 +25,6 @@ public function __construct()
         $this->add(new ReferencePathCommand());
         $this->add(new SummaryCommand());
         $this->add(new TopChildrenCommand());
+        $this->add(new StdClassShapesCommand());
     }
 }
diff --git a/analyzer/src/BitOne/PhpMemInfo/Console/Command/StdClassShapesCommand.php b/analyzer/src/BitOne/PhpMemInfo/Console/Command/StdClassShapesCommand.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace BitOne\PhpMemInfo\Console\Command;
+
+use BitOne\PhpMemInfo\Analyzer\StdClassShapesCollector;
+use BitOne\PhpMemInfo\Loader;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Helper\Table;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class StdClassShapesCommand extends Command {
+    /**
+     * {@inheritedDoc}.
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('stdclass-shapes')
+            ->setDescription('Show statistics on stdClass property names')
+            ->addArgument(
+                'dump-file',
+                InputArgument::REQUIRED,
+                'PHP Meminfo Dump File in JSON format'
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $dumpFilename = $input->getArgument('dump-file');
+        $loader = new Loader();
+        $items = $loader->load($dumpFilename);
+        $shapes = (new StdClassShapesCollector($items))->collect();
+        $table = new Table($output);
+        $this->formatTable($shapes, $table);
+        $table->render();
+        return 0;
+    }
+
+    /**
+     * Format data into a detailed table.
+     *
+     * @param array $shapes
+     * @param Table $table
+     */
+    protected function formatTable(array $shapes, Table $table)
+    {
+        $table->setHeaders(['Members', 'Instances Count', 'Cumulated Self Size (bytes)']);
+
+        $rows = [];
+
+        foreach($shapes as $members => $stats) {
+            $rows[] = [$members, $stats['count'], $stats['self_size']];
+        }
+
+        $table->setRows($rows);
+    }
+
+}