php looping through multiple arrays
Solution 1
If they have the same keys you can just loop through the keys and use them to index the arrays using array_keys
:
foreach(array_keys($array_one) as $key) {
// do something with $array_one[$key] and $array_two[$key]
}
If you're worried about some keys not existing you can try (e.g.) array_key_exists($key,$array_two)
.
Solution 2
$array_one = array (
'a' => 2,
'b' => 1,
'c' => 1
);
$array_two = array (
'a' => 1,
'b' => 2,
'c' => 1
);
$iterator = new MultipleIterator ();
$iterator->attachIterator (new ArrayIterator ($array_one));
$iterator->attachIterator (new ArrayIterator ($array_two));
foreach ($iterator as $item)
{
if ($item [0] > $item [1])
{
...
}
}
It's a little bit superfluous, really, but I see a certain beauty in it.
Solution 3
You can easily do it with foreach.
$array_one([a]=>2,[b]=>1,[c]=>1);
$array_two([a]=>1,[b]=>2,[c]=>1);
foreach($array_one as $array_one_key => $array_one_value) {
foreach($array_two as $array_two_key => $array_two_value) {
if ($array_one_key == $array_two_key && $array_two_value <= $array_one_value) {
print_r ($array_two);
}
}
}
Solution 4
$array_one = array('a'=>2,'b'=>1,'c'=>1);
$array_two = array('a'=>1,'b'=>2,'c'=>1);
$keys = array_keys($array_one);
for($x=0;$x<sizeof($array_one);$x++){
if($array_one[$keys[$x]] == $array_two[$keys[$x]]) {
echo "equal key:".$keys[$x]."\n";
}
}
output:
equal key:c
other one is better lol.
Solution 5
There may be better ways, but this will iterate through both arrays, using foreach for array_one and reset, next, and key for array_two.
$array_one = array('a'=>2,'b'=>1,'c'=>1,'x'=>3,'y'=>4);
$array_two = array('a'=>1,'b'=>2,'c'=>1,'d'=>3,'e'=>8);
$v2 = reset($array_two);
$k2 = key($array_two);
foreach ($array_one as $k1 => $v1) {
if ($k1 == $k2 && $v1 == $v2 ) {
echo "$k1 == $k2 && $v1 == $v2\n";
} elseif ($k1 == $k2) {
echo "$k1 == $k2 Keys match\n";
} elseif ($v1 == $v2) {
echo "$v1 == $v2 Values match\n";
} else {
echo "$k1 $v1 $k2 $v2 No match\n";
}
$v2 = next($array_two);
$k2 = key($array_two);
}
Comments
-
jkdba almost 2 years
okay so I have two arrays
$array_one([a]=>2,[b]=>1,[c]=>1); $array_two([a]=>1,[b]=>2,[c]=>1);
I want to be able to loop through both of these arrays simultaneously so I can make simple comparisons. I looked at using a foreach loop but I can only process the information one array at a time. I also looked at merging the arrays but I can not see the use in doing this since I need both the keys and values to make the comparisons. does anyone have a solution to this problem? I appreciate your time in advanced.
to be specific on the comparisons i want to something to this extent
if ($keyone == $keytwo && $valuetwo <= $valueone) { print_r ($array_two); }
Would it be possible to use recursion to loop instead of using and iterative loop?
-
jkdba about 12 yearsthis would output $array_two three time though
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Top Questions almost 10 yearsthis...is just beautiful...
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xPheRe over 9 yearsI really like the power of SPL iterators. This is called 'zip' in functional programming. I'm hoping for even more awesome iterators and utilities in the PHP future.
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Beta Projects over 9 yearsShould be foreach, not for.
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Niels Keurentjes about 8 yearsI love the code porn facet of this.