test/data/headers.php


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<?php

header( "Sample-Header: Hello World" );

$headers = array();

foreach( $_SERVER as $key => $value ) {

	$key = str_replace( "_" , "-" , substr( $key , 0 , 5 ) == "HTTP_" ? substr( $key , 5 ) : $key );
	$headers[ $key ] = $value;

}

foreach( explode( "_" , $_GET[ "keys" ] ) as $key ) {
	echo "$key: " . @$headers[ strtoupper( $key ) ] . "\n";
}