sample code

<?php


$callFileArray = array (
  "Channel"=>"SIP/200",
  "WaiteTime"=>"20",
  "Context"=>"test",
  "Extension"=>"1",
  "Priority"=>"1",
  "Archive"=>"yes"
) ;


$output_file="file.txt" ;
foreach ($callFileArray as $key=>$callFileArray) {

  $file=fopen($output_file, $key) ;
  fwrite( $file,  "This is  a simple test\n" );
  fclose( $file ) ;
}
?>