Question

header( 'Content-type: text/html; charset=utf-8' );
echo 'Begin ...<br />';
ob_start();
for( $i = 0 ; $i < 10 ; $i++ )
{
    echo $i . '<br />';
    flush();
    ob_flush();
    sleep(1);
}

为什么这些代码每秒都不输出$ i？它在10秒后输出

Answer 1

它实际上每秒输出WARN com.amazonaws.services.s3.internal.S3MetadataResponseHandler - Unable to parse last modified date: Mon, 25 May 2015 13:23:29 GMT java.lang.IllegalStateException: Joda-time 2.2 or later version is required, but found version: 2.0 at com.amazonaws.util.DateUtils.handleException(DateUtils.java:156) ~[filename-jar-with-dependencies.jar:na] at com.amazonaws.util.DateUtils.parseRFC822Date(DateUtils.java:204) ~[filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.internal.ServiceUtils.parseRfc822Date(ServiceUtils.java:78) ~[filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.internal.AbstractS3ResponseHandler.populateObjectMetadata(AbstractS3ResponseHandler.java:115) ~[filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.internal.S3ObjectResponseHandler.handle(S3ObjectResponseHandler.java:52) [filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.internal.S3ObjectResponseHandler.handle(S3ObjectResponseHandler.java:30) [filename-jar-with-dependencies.jar:na] at com.amazonaws.http.AmazonHttpClient.handleResponse(AmazonHttpClient.java:1050) [filename-jar-with-dependencies.jar:na] at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:724) [filename-jar-with-dependencies.jar:na] at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:467) [filename-jar-with-dependencies.jar:na] at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:302) [filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3672) [filename-jar-with-dependencies.jar:na] at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1160) [filename-jar-with-dependencies.jar:na] Caused by: java.lang.IllegalArgumentException: Invalid format: "Mon, 25 May 2015 13:23:29 GMT" is malformed at "GMT" at org.joda.time.format.DateTimeFormatter.parseMillis(DateTimeFormatter.java:747) ~[joda-time-2.0.jar:2.0] at com.amazonaws.util.DateUtils.parseRFC822Date(DateUtils.java:202) ~[filename-jar-with-dependencies.jar:na] ... 15 common frames omitted，但是当你在服务器端（使用PHP）时，只有在整个PHP已经执行后才会加载页面。

如果您希望页面每秒输出每个索引$i，您应该在javascript中执行此操作。

Answer 2

在我看来，从终端运行时，你的代码确实每1秒输出$ i，但在通过网络加载时它不会这样做。

您的解决方法是启用隐式刷新：http://php.net/manual/en/function.ob-implicit-flush.php

删除ob_start()电话。以下代码完美无缺：

<?php
    header( 'Content-type: text/html; charset=utf-8' );
    echo 'Begin ...<br />';
    ob_implicit_flush (1);
    for( $i = 0 ; $i < 10 ; $i++ )
    {
        echo $i . '<br />';
        flush();
        ob_flush();
        sleep(1);
    }
?>

PHP实时输出时出错

2 个答案: