Along with the release of our request_uri for IIS yesterday, we have another useful tip for a second function commonly found in WordPress plugins and other PHP redistributable scripts. apache_response_headers is used to get a list of all the headers sent out by a page, in the format of an associative array.\n<\/p>\n
IIS doesn\u2019t use this function, and before PHP5, there was no way to properly emulate its behavior. But on PHP5, it\u2019s nothing too difficult. Without further ado, here\u2019s the code:\n<\/p>\n
<?php \nif (!function_exists('apache_response_headers')){ \n\tfunction apache_response_headers(){ \n\t\t$nstList; \n\t\tforeach (headers_list() as $nstHeader){ \n\t\t\t$nstObj = substr($nstHeader, 0, strpos($nstHeader, ": ")); \n\t\t\t$nstObjVal = substr($nstHeader, strpos($nstHeader, ": ")+2); \n\t\t\t$nstList[$nstObj] = $nstObjVal; \n\t\t} \n\t\treturn $nstList; \n\t} \n}\n?><\/pre><\/p>\nIt’s fairly straight forward code that involves changing the contents of a normal array into an associative one with a part of the string as the index name. It works because we know what form the content of the original array is going to take. To test the code:\n<\/p>\n
<?php \n\/\/generate some headers:\nif (!headers_sent()) {\n\theader('Content-Type: plain\/text'); \n\theader("Cache-Control: no-cache, must-revalidate"); \n\theader("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); \n\theader('Content-type: application\/pdf'); \n\theader('Content-Disposition: attachment; filename="downloaded.pdf"');\n}\n\n\/\/Test the output. See what's in the array. \nprint_r(apache_response_headers());\n?><\/pre>\nIt’s always a good idea to use if(!headers_sent()):<\/code> before attempting to send your own headers \u2013 just in case your function is being called when it shouldn’t be. The code fragment above returns the following when executed:\n<\/p>\nArray\r\n(\r\n [X-Powered-By] => PHP\/5.1.6\r\n [Cache-Control] => no-cache, must-revalidate\r\n [Expires] => Mon, 26 Jul 1997 05:00:00 GMT\r\n [Content-type] => application\/pdf\r\n [Content-Disposition] => attachment; filename=\"downloaded.pdf\"\r\n)\r\n<\/pre>\nYou can test it yourself on a normal Apache webserver, but you don’t have to \u2014 it’s exactly the same thing, line-for-line, byte-for-byte.<\/p>\n","protected":false},"excerpt":{"rendered":"
Along with the release of our request_uri for IIS yesterday, we have another useful tip for a second function commonly found in WordPress plugins and other PHP redistributable scripts. apache_response_headers is used to get a list of all the headers … Continue reading