I'm not trying to change this list into a PHP forum, but I have a
question regarding speed optimization in PHP, especially about data
accumulation
into strings... I need to accumulate a large number of pixel values
into a string before
Excuses excuses... that's just because you know that here you will
get a rapid answer ;-). We should avoid this, however.
First thing, try by changing to one of these:
(1) "$myValue1 $myValue1 $myValue1\t" ;
(2) $myValue1 . ' ' . $myValue1 . ' ' . $myValue1 . "\t" ;
(and $s0 = '';)
(2) should a priori be the fasted (except that \t has to be in
quotes). Content in "" is interpreted (if you put a variable , then
it is replaced by its value). Content in '' is not.
Otherwise, if you want to explore arrays:
array_push -- Push one or more elements onto the end of array
<http://uk.php.net/function.array-push>
implode -- Join array elements with a string
<http://uk.php.net/manual/en/function.implode.php>
For the rest:
PHP Optimization Tricks
<http://ilia.ws/archives/12-PHP-Optimization-Tricks.html>
$s0 = "" ;
$s = "" ;
for($y = 0; $y < $h; $y++) {
$s0 = '' ;
for($x = 0; $x < $w; $x++) {
$s0 .= $myValue1 . " " . $myValue1 . " " . $myValue1 . "\t" ;
}
$s .= $s0 . "\n" ;
}
Thanks,
JB
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Marielle Lange (PhD), http://widged.com
Bite-size Applications for Education
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