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what is the diffrence between for and foreach?
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Answer Posted / jennifer
A for loop is run on a condition, and will run until the
condition is false. Usually this is a counter, and the
condition is a threshold. (It can also easily be run
backwards, using $i-- instead of $i++.)
- so if the loop is "for ($i = 0; $i < 10; $i++)", it will
run 10 times, with $i beieng equal to 0, then 1, then
2, ... then 9, then when it reaches 10 the condition is
false and it jumps out to the next statement after the loop.
It can also be run with a condition unrelated to the
counter, or with non-counter-related statements, but
usually a while loop is better for that (and the
possibility of an accidental endless loop is much greater).
- like "for ($size = 0; $bag == 'full'; $size += 5)" which
assumes that somewhere (hopefully) the variable $bag gets
set to 'full' within the loop at some point. $i is just
counting the number of times the loop runs (or number of
items in the bag, in this case).
A foreach runs through an array (counted or associative),
executing the code in the the loop once for each element of
the array, with the array element (and optionally, the
associated key) available as variables.
- so "foreach ($lineup as $person)" will run the code in
the loop once for each person.
- "foreach ($lineup as $position => $person)" will do the
same thing but make the $position variable available,
especially useful for associative arrays.
| Is This Answer Correct ? | 13 Yes | 4 No |
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