02-19-2008
awk arrays are associative - they hash aray indexes.
The syntax says: add one to the array element indexed zero.
But, since the ++ is after the arr[] it means evaluate the value of arr[] before you add one.
So - if arr[ $0 ] is one -- meaning it has been seen before - print $0 because it is a duplicate, then add one to arr[ $0 ]. Now: arr[ $0 ] == 2 so we never print it again no matter how many times it appears.
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LEARN ABOUT PHP
ps_setpolydash
PS_SETPOLYDASH(3) 1 PS_SETPOLYDASH(3)
ps_setpolydash - Sets appearance of a dashed line
SYNOPSIS
bool ps_setpolydash (resource $psdoc, float $arr)
DESCRIPTION
Sets the length of the black and white portions of a dashed line. ps_setpolydash(3) is used to set more complicated dash patterns.
PARAMETERS
o $psdoc
- Resource identifier of the postscript file as returned by ps_new(3).
o $arr
-$arr is a list of length elements alternately for the black and white portion.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
Drawing a dashed line
<?php
$ps = ps_new();
if (!ps_open_file($ps, "polydash.ps")) {
print "Cannot open PostScript file
";
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.
SEE ALSO
ps_setdash(3).
PHP Documentation Group PS_SETPOLYDASH(3)