Unsorted array, headers_list(), make keys for array?

问题

As you know, the headers_list()-PHP-function returns an array like this:

Array
(
    [0] => Content-type: text/html; charset=utf-8
    [1] => key: value
    [2] => key2: value2
)

In general (or with this example), how can you build a new array using the "key" in the arrays value? For example, the array above becomes:

Array
(
    ['Content-type'] => text/html; charset=utf-8
    ['key'] => value
    ['key2'] => value2
)

This is probably really basic, but I am still a beginner :)

回答1:

This should work:

$headers = header_list();
foreach($headers as $header){
    // split each header by ':' and assign them to $key and $value
    list($key, $value) = explode(':', $header, 2); // limit the explode to 2 items. 
    // add trimed variables to the new array
    $new_headers[trim($key)] = trim($value);
}

Probably trim for $key is not really important, but for value it really is, because you will remove the space after the ':'.

回答2:

You should use this function apache_response_headers instead , is return the header in array ...

however, the function name expose it works for apache only

updated: PHP need to compile with --with-apxs2

回答3:

foreach($headers as $v) {
    list($name,$val) = explode(': ',$v);
    $newArray[$name] = $val;
}

// $newArray is your requested array.

回答4:

The following function is be able to handle multiple header fields with the same field name and combines them as stipulated by the specification:

Multiple message-header fields with the same field-name MAY be present in a message if and only if the entire field-value for that header field is defined as a comma-separated list [i.e., #(values)]. It MUST be possible to combine the multiple header fields into one "field-name: field-value" pair, without changing the semantics of the message, by appending each subsequent field-value to the first, each separated by a comma.

function getHeaderFields() {
    $fields = array();
    $index = array();
    foreach (headers_list() as $field) {
        list($name, $value) = explode(':', $field, 2);
        $name = trim($name);
        if (isset($index[strtolower($name)])) {
            $name = $index[strtolower($name)];
        } else {
            $index[strtolower($name)] = $name;
        }
        if (isset($fields[$name])) {
            $fields[$name] .= ', '.trim($value);
        } else {
            $fields[$name] = trim($value);
        }
    }
    return $fields;
}

This works in opposite to apache_response_headers or the other mentioned solutions:

setcookie('foo', 'bar');
setcookie('bar', 'quux');
$headers = getHeaderFields();
var_dump($headers['Set-Cookie']);      // string(17) "foo=bar, bar=quux"
$headers = apache_response_headers();
var_dump($headers['Set-Cookie']);      //  string(8) "bar=quux"

回答5:

$headers = header_list();
$keyed_headers = array();
foreach ($headers as $header) {
    $break = explode(': ', $header, 2);
    $keyed_headers[$break[0]] = $break[1];
}

UPDATE

On a whim, I decided that it would be MoarAwesome^TM to solve this problem using a class. This was the result:

// definition
class HeaderArray extends ArrayObject {
    static function init() {
        return new self(header_list());
    }
    public function get_assoc() {
        $result = new self();
        foreach ($this as $v) {
            $b = explode(': ', $v, 2);
            $result[$b[0]] = $b[1];
        }
        return $result;
    }
}

// implementation
$headers = HeaderArray::init()->get_assoc();

回答6:

I think this is better: you should reimplode the remainder in case there was a ':' in a value

$hList = headers_list();

    foreach ($hList as $header) {
        $header = explode(":", $header);
        $headers[ array_shift($header) ] = trim( implode(":", $header) );
    }

来源：https://stackoverflow.com/questions/4475345/unsorted-array-headers-list-make-keys-for-array