php的file_get_contents为什么很慢？

Question

测试代码 <?php function sendGetByCurl($url, $time) { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_TIMEOUT, $time); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $time); $return = curl_exec($ch); curl_close($ch); return $return; } $url = 'http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTIrQKRNquic8GwsU951TC7PDCFzIew3RFwTOFoNx8u1fln0FOzHv04YBoEqXPTHHfyU0Xa1qoFULCw/132'; $start1 = microtime(true); $data1 = file_get_contents($url); file_put_contents('1.jpg', $data1); $end1 = microtime(true); $span1 = $end1 - $start1; echo $span1 . PHP_EOL; $start2 = microtime(true); $data2 = sendGetByCurl($url, 3); file_put_contents('2.jpg', $data2); $end2 = microtime(true); $span2 = $end2 - $start2; echo $span2 . PHP_EOL; exit; 测试结果 16.397258043289 0.18160080909729 那张图片浏览器访问或者wget下载都很快的，很奇怪

Answer 1

这是file_get_contents的一个bug，在最新php版本中已经修复。在google里搜一下吧，有解释很详细的原因。