PHP中的内容类型标题

Question

I am creating a wordpress plugin which fetched some data and then echos a json_encode .

This is being done by creating a function and calling it from a shortcode.

The shortcode is being injected in blank page template from wordpress pages.

I am trying to set the header to application/json in the function of the shortcode plugin however this is being ignore and the content type is still set to HTML/TEXT.

I am setting the header this way:

header('Content-Type: application/json'); 

The whole plugin thing looks like this:

<?php function abc_func(){

    header('content-type: application/json; charset=utf-8');

    $abc_array = array(
                    'abc' => $abc
    );

    echo json_encode($abc_array);

}

add_shortcode('abc_shortcode', 'abc_func');

?>

Answer 1

这可能导致在设置标题（或在您的插件代码之前）之前，有些数据已发送到输出，请确保您在这些标题之前设置了标题。

Answer 2

Check your php.ini file for the output_buffering setting. If it's not set to "off" than PHP is automatically doing output buffering for you. Set that to off and echo something before the header command, and you should see the "classic error".

Content-type not working in PHP

Answer 3

Try this.

header('content-type: application/json; charset=utf-8');

Is there any place that changed the content type later?

Edited 2017-03-02

Content-type not working in PHP

Check your php.ini file for the output_buffering setting. If it's not set to "off" than PHP is automatically doing output buffering for you. Set that to off and echo something before the header command, and you should see the "classic error".