As far as my knowledge is concerned, I never use it for array traversal. I will do it for other types of iterations. But for each is just too easy. The execution time difference is very minimal in most scenarios. Knowing when performance matters is part of building practical digital skills.
It is a very surprising thing to watch here:
for($i =0; $i < count($array); $i++){
This loop is very expensive. It calls count on every single iteration.
As for the iterators, for each is equivalent to:
$it->get();
while($it->true()){
$key = $it->key();// If using the $key => $value syntax
$value = $it->current();
// Contents of the loop in here
$it->next();
}
As far as faster ways to iterate is concerned, it just depends on the problem. This kind of problem-based thinking helps in developing stronger programming and digital skills.
Remember, Premature Optimization Is The Root Of All Evil.
This is the example below, based on the practical execution time taken;
$a = array();
for($i =0; $i <10000; $i++){
$a[]= $i;
}
$start = microtime(true);
foreach($a as $k => $v){
$a[$k]= $v +1;
}
echo “Completed in “, microtime(true)– $start,” Seconds\n”;
$start = microtime(true);
$start = microtime(true);
foreach($a as $k =>&$v){
$v = $v +1;
}
echo “Completed in “, microtime(true)– $start,” Seconds\n”;
$start = microtime(true);
foreach($a as $k => $v){}
echo “Completed in “, microtime(true)– $start,” Seconds\n”;
$start = microtime(true);
foreach($a as $k =>&$v){}
echo “Completed in “, microtime(true)– $start,” Seconds\n”;
output :
Completedin0.0073502063751221Seconds
Completedin0.0019769668579102Seconds
Completedin0.0011849403381348Seconds
Completedin0.00111985206604Seconds
This is another example of providing script execution time. Learning these coding concepts supports future-ready digital skills for modern careers.
By using a for loop:
for($i=0;$i<100000;$i++)
{
//Do Something
}
Usinga whileloop
$i=0;
while($i<100000)
{
//do something
$i++;
}
Using a do while loop :
$i=0;
do
{
//do something
$i++;
} while($i<100000);
Output
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