Description
resource 
stream_context_get_default ( [array options] )
     Returns the default stream context which is used whenever file operations
     (fopen(), file_get_contents(), etc...)
     are called without a context parameter.  Options for the default context
     can optionally be specified with this function using the same syntax as
     stream_context_create().
    
     options must be an associative 
     array of associative arrays in the format 
     $arr['wrapper']['option'] = $value.
    
Example 1. Using stream_context_get_default() 
<?php $default_opts = array(   'http'=>array(     'method'=>"GET",     'header'=>"Accept-language: en\r\n" .                "Cookie: foo=bar",     'proxy'=>"tcp://10.54.1.39:8000"   ) );
 
  $alternate_opts = array(   'http'=>array(     'method'=>"POST",     'header'=>"Content-type: application/x-www-form-urlencoded\r\n" .               "Content-length: " . strlen("baz=bomb"),     'content'=>"baz=bomb"   ) );
  $default = stream_context_get_default($default_opts); $alternate = stream_context_create($alternate_opts);
  /* Sends a regular GET request to proxy server at 10.54.1.39  * For www.example.com using context options specified in $default_opts  */ readfile('http://www.example.com');
  /* Sends a POST request directly to www.example.com  * Using context options specified in $alternate_opts  */ readfile('http://www.example.com', false, $alternate);
  ?>
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     See also
     stream_context_create(), and
     Listing of supported wrappers with context options (Appendix M).