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(PECL ps >= 1.1.0)
ps_setpolydash — Sets appearance of a dashed line
$psdoc 
   ,  float $arr 
   )Sets the length of the black and white portions of a dashed line. ps_setpolydash() is used to set more complicated dash patterns.
psdoc Resource identifier of the postscript file as returned by ps_new() .
arr  arr is a list of length elements alternately for
       the black and white portion.
      
   成功时返回  TRUE , 或者在失败时返回  FALSE 。
  
Example #1 Drawing a dashed line
  <?php
$ps  =  ps_new ();
if (! ps_open_file ( $ps ,  "polydash.ps" )) {
   print  "Cannot open PostScript file\n" ;
     exit;
}
 ps_set_info ( $ps ,  "Creator" ,  "polydash.php" );
 ps_set_info ( $ps ,  "Author" ,  "Uwe Steinmann" );
 ps_set_info ( $ps ,  "Title" ,  "Poly dash example" );
 ps_begin_page ( $ps ,  596 ,  842 );
 ps_setpolydash ( $ps , array( 10 ,  5 ,  2 ,  5 ));
 ps_moveto ( $ps ,  100 ,  100 );
 ps_lineto ( $ps ,  200 ,  200 );
 ps_stroke ( $ps );
 ps_end_page ( $ps );
 ps_delete ( $ps );
 ?>   This example draws a line with a 10 and 2 points long line, and gaps of 5 points inbetween.