Add examples for Curl::setRetry() and MultiCurl::setRetry()

Author: zachborboa

examples/get_with_callable_retry.php

@@ -0,0 +1,19 @@
+<?php
+require __DIR__ . '/../vendor/autoload.php';
+
+use \Curl\Curl;
+
+$curl = new Curl();
+$curl->setRetry(function ($instance) {
+    return $instance->retries < 3;
+});
+$curl->get('https://httpbin.org/status/503');
+
+if ($curl->error) {
+    echo 'Error: ' . $curl->errorCode . ': ' . $curl->errorMessage . "\n";
+    echo 'attempts: ' . $curl->attempts . "\n";
+    echo 'retries: ' . $curl->retries . "\n";
+} else {
+    echo 'Response:' . "\n";
+    var_dump($curl->response);
+}

examples/get_with_retry.php

@@ -0,0 +1,19 @@
+<?php
+require __DIR__ . '/../vendor/autoload.php';
+
+use \Curl\Curl;
+
+$max_retries = 3;
+
+$curl = new Curl();
+$curl->setRetry($max_retries);
+$curl->get('https://httpbin.org/status/503');
+
+if ($curl->error) {
+    echo 'Error: ' . $curl->errorCode . ': ' . $curl->errorMessage . "\n";
+    echo 'attempts: ' . $curl->attempts . "\n";
+    echo 'retries: ' . $curl->retries . "\n";
+} else {
+    echo 'Response:' . "\n";
+    var_dump($curl->response);
+}

examples/multi_curl_get_with_callable_retry.php

@@ -0,0 +1,20 @@
+<?php
+require __DIR__ . '/../vendor/autoload.php';
+
+use \Curl\MultiCurl;
+
+$multi_curl = new MultiCurl();
+$multi_curl->setRetry(function ($instance) {
+    return $instance->retries < 3;
+});
+$multi_curl->complete(function ($instance) {
+    echo 'call to "' . $instance->url . '" completed.' . "\n";
+    echo 'attempts: ' . $instance->attempts . "\n";
+    echo 'retries: ' . $instance->retries . "\n";
+});
+
+$multi_curl->addGet('https://httpbin.org/status/503?a');
+$multi_curl->addGet('https://httpbin.org/status/503?b');
+$multi_curl->addGet('https://httpbin.org/status/503?c');
+
+$multi_curl->start();

examples/multi_curl_get_with_retry.php

@@ -0,0 +1,20 @@
+<?php
+require __DIR__ . '/../vendor/autoload.php';
+
+use \Curl\MultiCurl;
+
+$max_retries = 3;
+
+$multi_curl = new MultiCurl();
+$multi_curl->setRetry($max_retries);
+$multi_curl->complete(function ($instance) {
+    echo 'call to "' . $instance->url . '" completed.' . "\n";
+    echo 'attempts: ' . $instance->attempts . "\n";
+    echo 'retries: ' . $instance->retries . "\n";
+});
+
+$multi_curl->addGet('https://httpbin.org/status/503?a');
+$multi_curl->addGet('https://httpbin.org/status/503?b');
+$multi_curl->addGet('https://httpbin.org/status/503?c');
+
+$multi_curl->start();