Add crypto price logging feature and improve exchange initialization

Exchange/Resources/Php/Exchange/ExchangeManager.php

@@ -1,15 +1,22 @@
-<?php
-
-namespace Resources\Php\Exchange;
-
-use Resources\Php\Exchange\exchanges\Binance;
-
-class ExchangeManager {
-    private string $selectedExchange = 'binance';
-
-    public function getExchange(string $exchange, string $apiKey, string $apiSecret): Exchange {
-        //TODO: exchange selection
-        return new Binance($apiKey, $apiSecret);
-    }
-}
-?>
+<?php
+
+namespace Resources\Php\Exchange;
+
+use Resources\Php\Exchange\exchanges\Binance;
+use Resources\Php\Exchange\PriceLogger;
+
+class ExchangeManager {
+
+    private string $selectedExchange = 'binance';
+
+    public function getExchange(string $exchange, string $apiKey, string $apiSecret): Exchange
+    {
+        // Log when exchange is initialized
+        $logger = new PriceLogger();
+        $logger->logPrice($exchange, 0.0);
+
+        // TODO: exchange selection
+        return new Binance($apiKey, $apiSecret);
+    }
+}
+?>

Exchange/Resources/Php/Exchange/PriceLogger.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Resources\Php\Exchange;
+
+class PriceLogger
+{
+    private string $logFile;
+
+    public function __construct()
+    {
+        $this->logFile = __DIR__ . "/price_history.log";
+    }
+
+    public function logPrice(string $symbol, float $price): void
+    {
+        $timestamp = date("Y-m-d H:i:s");
+
+        $entry = "[" . $timestamp . "] " . $symbol . " => " . $price . PHP_EOL;
+
+        try {
+            file_put_contents($this->logFile, $entry, FILE_APPEND);
+        } catch (\Exception $e) {
+            error_log("Price Logger Error: " . $e->getMessage());
+        }
+    }
+}

README.md

@@ -116,3 +116,9 @@ class ExchangeName extends Exchange {
 
 Im not sure if i will continue to work on this project, but if people want me to i will probaly continue.
 For private support, Contact me via discord Rick404#8294.
+
+
+## Contribution
+
+This project was improved as part of a learning contribution.
+Contributor: Sneha Debnath