Fix php-curl-class#322,php-curl-class#369: Add chunked transfer-encoding example

Author: zachborboa

examples/put_large_file_chunked.php

@@ -0,0 +1,31 @@
+<?php
+// PUT a file using chunked data.
+// See also "examples/receive_large_file_chunked.php".
+
+require __DIR__ . '/vendor/autoload.php';
+
+use \Curl\Curl;
+
+function read_file($ch, $fd, $length) {
+    $data = fread($fd, $length);
+    return $data;
+}
+
+$filename = 'large_image.png';
+$fp = fopen($filename, 'rb');
+
+$curl = new Curl();
+$curl->setHeader('Transfer-Encoding', 'chunked');
+$curl->setOpt(CURLOPT_UPLOAD, true);
+$curl->setOpt(CURLOPT_INFILE, $fp);
+$curl->setOpt(CURLOPT_INFILESIZE, filesize($filename));
+$curl->setOpt(CURLOPT_READFUNCTION, 'read_file');
+$curl->put('http://127.0.0.1:8000/');
+
+fclose($fp);
+
+if ($curl->error) {
+    echo 'Error: ' . $curl->errorMessage . "\n";
+} else {
+    echo 'Success' . "\n";
+}

examples/receive_large_file_chunked.php

@@ -0,0 +1,20 @@
+<?php
+// Receive PUT file.
+// See also "examples/put_large_file_chunked.php".
+
+function file_get_contents_chunked($filename, $chunk_size, $callback) {
+    $handle = fopen($filename, 'r');
+    while (!feof($handle)) {
+        call_user_func_array($callback, array(fread($handle, $chunk_size)));
+    }
+    fclose($handle);
+}
+
+$tmpnam = tempnam('/tmp', 'php-curl-class.');
+$file = fopen($tmpnam, 'wb+');
+
+// Use file_get_contents_chunked() rather than file_get_contents() to avoid error:
+// "Fatal error:  Allowed memory size of ... bytes exhausted (tried to allocate ... bytes) in ... on line 0".
+file_get_contents_chunked('php://input', 4096, function($chunk) use (&$file) {
+    fwrite($file, $chunk);
+});