Suppose I have two arrays:
$a1 = array(0, 1, 2);
$a2 = array(3, 4, 5);
I want to be able to do a merge technique that alternates the array values and not just concatenate them. I want this result:
array(0, 3, 1, 4, 2, 5);
Is there a native way to do this as performance is an issue here since I need to do this thousands of times
Please note, I know I can do it like this:
for (var $i = 0; $i < count($a1); $i++) {
newArray[] = $a1[$i];
newArray[] = $b1[$i];
}
I'm looking for a built in way if there is a faster one.
$count = count($a1);
for ($i = 0; $i < $count; $i++) {
$newArray[] = $a1[$i];
$newArray[] = $b1[$i];
}
My work here is done.
$a1 = array(0,1,2);
$a2 = array(3,4,5);
$start = microtime(TRUE);
for($t = 0; $t < 100000; $t++)
{
$newArray = array();
$count = count($a1);
for ($i = 0; $i < $count; $i++)
{
$newArray[] = $a1[$i];
$newArray[] = $a2[$i];
}
}
echo round(microtime(TRUE) - $start, 2); # 0.6
$a1 = array(0,1,2);
$a2 = array(3,4,5);
$start = microtime(TRUE);
for($t = 0; $t < 100000; $t++)
{
$newArray = array();
for ($i = 0; $i < count($a1); $i++)
{
$newArray[] = $a1[$i];
$newArray[] = $a2[$i];
}
}
echo round(microtime(TRUE) - $start, 2); # 0.85
So pre-counting array size will be ~1/4 [citation needed] (on freakin' 100.000 iterations you will gain 0.2 in total) faster. If you put count()
inside loop, it will recount on every iteration
. 1/4 seems to me a reasonably faster. If you are looking for compiled function, you can stop.
P.S. Benchmark is like bikini, it shows you everything, and nothing.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With