zendframework / zend-httphandlerrunner Goto Github PK

Hi, in my framework, ofter need output someting with ob content, like a image captcha, then I get this error

`
Uncaught Zend\HttpHandlerRunner\Exception\EmitterException: Output has been emitted previously; cannot emit response

`

so I 'm curious, why do I have to perform a $this->assertNoPreviousOutput(); check?

composer require zendframework/zend-httphandlerrunner

[InvalidArgumentException]
Package zendframework/zend-httphandlerrunner at version has a PHP requirement incompatible with your PHP version (5.6.40)

I'm not be able to include this package in my project (server is PHP 7.2). I execute "composer require zendframework/zend-httphandlerunner" and here's the error output:

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for zendframework/zend-httphandlerrunner ^1.1 -> satisfiable by zendframework/zend-httphandlerrunner[1.1.0].
    - zendframework/zend-httphandlerrunner 1.1.0 requires psr/http-message-implementation ^1.0 -> no matching package found.

I noticed the HTTP status code gets applied with every individual header() call:

https://github.com/zendframework/zend-httphandlerrunner/blob/master/src/Emitter/SapiEmitterTrait.php#L84-L88

But headers get emitted before the status line:

https://github.com/zendframework/zend-httphandlerrunner/blob/master/src/Emitter/SapiEmitter.php#L28-L29

And the status line gets emitted last, with the status code:

https://github.com/zendframework/zend-httphandlerrunner/blob/master/src/Emitter/SapiEmitterTrait.php#L60-L65

Any reason why it isn't enough to just apply the status code last with emitStatusLine()?

Note that this isn't an issue with the code, merely a bit of a comprehension difficulty.

I'm sure it isn't harmful to apply the status code repeatedly - but unless it's meaningful, it's probably confusing more than it is helpful to a person reading the code?