php：达到重定向限制

Question

我正在运行以下循环：

for ($i=0; $i < 30; $i++) {
    sleep(2);
    $content = file_get_contents('http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444528825');
}

基本上，我正在运行一个从 json 文件获取数据的 cronjob（每分钟 30 次）。我收到的文件正在自动更新。无数据时为空，有数据则有数据。

所以基本上当文件为空时我得到这个错误：

PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534443): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found

没关系，可以理解，但问题是有时我会收到此错误：

PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534451): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60

我搜索了它，但没有找到出现第二个错误的任何原因。我能做些什么？ 是否有更聪明的方法来编写此脚本或避免出现错误？

错误日志示例：

PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534443): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534445): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534447): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534449): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534451): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534454): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534456): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534458): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534460): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534462): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534464): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534466): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534468): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534470): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534500): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60
PHP Warning:  file_get_contents(http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1444534502): failed to open stream: Redirection limit reached, aborting in /home/dupdates/domains/dupdates.com/public_html/systems/history/script.php on line 60

Answer 1

我用 curl 代替：

<?php
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, 'http://www.oref.org.il/WarningMessages/Alert/alerts.json?v=1'); 

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FRESH_CONNECT, TRUE);
        curl_setopt($ch, CURLOPT_TIMEOUT, '3');
        $content = curl_exec($ch);
        curl_close($ch);