Added pretty print option

demo.php

@@ -24,7 +24,8 @@
 // Create the instance
 $blockchain = new Blockchain('demo-coin', $path, [
     'difficulty' => $difficulty,
-    'lookback' => $lookback
+    'lookback' => $lookback,
+    'pretty' => true
 ]);
 
 // Insert Blocks
@@ -48,13 +49,13 @@
 print("\nLast Block:\n");
 
 $latest = $blockchain->last();
-print($latest->toJson());
+print($latest->toJson(['pretty' => true]));
 
 print("\nGoing through all Blocks..\n");
 
 foreach ($blockchain->all(['reverse' => false]) as $block) {
     print("Block #{$block->index}\n");
-    print($block->toJson() . "\n");
+    print($block->toJson(['pretty' => true]) . "\n");
 }
 
 print("\nThere are {$blockchain->count()} Blocks in the Blockchain\n");

src/Block.php

@@ -171,11 +171,19 @@ private function hashTransactions(array $transactions): array
     /**
      * Returns the Block as a JSON string
      *
+     * @param array $options The following options keys are supported:
+     *  - pretty: default:false toggle JSON pretty print
      * @return string
      */
-    public function toJson(): string
+    public function toJson(array $options = []): string
     {
-        return json_encode($this->toArray(), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        $options += ['pretty' => false];
+        $jsonOptions = JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES;
+        if ($options['pretty']) {
+            $jsonOptions |= JSON_PRETTY_PRINT;
+        }
+
+        return json_encode($this->toArray(), $jsonOptions);
     }
 
     /**

src/Blockchain.php

@@ -37,17 +37,20 @@ class Blockchain
      */
     protected bool $exists = false;
 
+    protected bool $pretty;
+
     /**
      * @param string $name the name of the Blockchain lower case letters numbers, dashes.
      * @param string $path Path to the folder where the Blockchain is stored.
      * @param array $options The following options keys are supported
      *  - difficulty: difficulty level for proof of work, set to 0 to disable
      *  - version: the version number of the Blockchain
      *  - lookback: the number of Blocks to lookback at to see if there are duplicate Transactions.
+     *  - pretty: default:false. Writes Blocks using JSON pretty print
      */
     public function __construct(string $name, string $path, array $options = [])
     {
-        $options += ['difficulty' => 8, 'version' => 1,'lookback' => 25];
+        $options += ['difficulty' => 8, 'version' => 1,'lookback' => 25,'pretty' => false];
 
         if (! preg_match('/^[a-z0-9-]+$/i', $name)) {
             throw new InvalidArgumentException('Invalid Blockchain name');
@@ -63,6 +66,7 @@ public function __construct(string $name, string $path, array $options = [])
         $this->lookback = $options['lookback'];
 
         $this->exists = is_dir($this->path);
+        $this->pretty = $options['pretty'];
     }
 
     /**
@@ -339,7 +343,7 @@ protected function writeBlock(Block $block): void
     {
         $path = $this->blockPath($block->index);
 
-        if (! $this->fs->write($path, $block->toJson(), true)) {
+        if (! $this->fs->write($path, $block->toJson(['pretty' => $this->pretty]), true)) {
             throw new BlockchainException('Error writing Block');
         }
         $this->index->add($block);