Add additional progress bar example

Author: zachborboa

examples/progress.php

@@ -4,12 +4,12 @@
 use \Curl\Curl;
 
 $curl = new Curl();
-$curl->progress(function ($client, $download_size, $downloaded, $upload_size, $uploaded){
+$curl->progress(function($client, $download_size, $downloaded, $upload_size, $uploaded) {
     if ($download_size === 0) {
         return;
     }
 
-    $progress = floor( $downloaded * 100 / $download_size );
-    echo ' ' . $progress . '%' . "\r";
+    $percent = floor( $downloaded * 100 / $download_size );
+    echo ' ' . $percent . '%' . "\r";
 });
 $curl->download('https://php.net/distributions/manual/php_manual_en.html.gz', '/tmp/php_manual_en.html.gz');

examples/progress_advanced.php

@@ -0,0 +1,24 @@
+<?php
+require '../src/Curl/Curl.php';
+
+use \Curl\Curl;
+
+$curl = new Curl();
+$curl->progress(function($client, $download_size, $downloaded, $upload_size, $uploaded) {
+    if ($download_size === 0) {
+        return;
+    }
+
+    // Display a progress bar: xxx% [=======>             ]
+    $percent = (int)floor( $downloaded * 100 / $download_size );
+    $percentage = sprintf('%3d%%', $percent);
+    $arrow_length = 40;
+    $arrow_tail_length = max(1, floor(($percent / 100 * $arrow_length) - 3));
+    $space_length = max(0, $arrow_length - $arrow_tail_length - 3);
+    $arrow = '[' . str_repeat('=', $arrow_tail_length) . '>' . str_repeat(' ', $space_length) . ']';
+    echo ' ' . $percentage . ' ' . $arrow . "\r";
+});
+$curl->complete(function($instance) {
+    echo "\n" . 'download complete' . "\n";
+});
+$curl->download('https://php.net/distributions/manual/php_manual_en.html.gz', '/tmp/php_manual_en.html.gz');