i have an array of the following elements
[null, null, 1, 4, 6, null, null, null, null]
how i can remove only the right side nulls from the array so it will become
[null, null, 1, 4, 6]
i tried array_filter but it's remove all the falsie values
$arr = array_filter([null, null, 1, 4, 6, null, null, null, null]);
the result was
$arr = [1, 4, 6]
You can make use of that array_filter result itself. You get all values that aren't NULL. So get the last key from that array and that is your end limit for array_slice function.
<?php
$arr = [null, null, 1, 4, 6, null, null, null, null,null];
$filtered_arr = array_filter($arr);
end($filtered_arr);
$limit = key($filtered_arr) + 1;
$arr = array_slice($arr,0,$limit);
print_r($arr);
Demo: https://3v4l.org/RVcjt
Update:
If the input array contains a 0, above answer could lead to incorrect results.
To rectify the same, we can filter out only NULL values from the array.
<?php
$arr = [null, null, 1, 4, 6, null, 0, null, null,null];
$filtered_arr = array_filter($arr,function($value){
return !is_null($value);
});
end($filtered_arr);
$limit = key($filtered_arr) + 1;
$arr = array_slice($arr,0,$limit);
print_r($arr);
Demo: https://3v4l.org/S5a96
[null, null, 1, 4, 6, null, 0, null, null,null] as it gives the same result as it currently does.
You can try the below code
$notNull = true;
$item = [null, null, 1, 4, 6, null, null, null, null];
$output = array();
for($i=count($item)-1;$i>=0;$i--){
if( is_null( $item[$i]) && $notNull ){
continue;
}
else{
$notNull = false;
$output[] = $item[$i];
}
}
$output = array_reverse($output);
You could use array_pop() to remove items of the end till a non-null value is encountered (or an empty array) and then push the last item back on...
$array = [null, null, 1, 4, 6, null, null, null, null];
while( count($array) > 0 && ($end = array_pop($array)) === null );
array_push($array, $end);
print_r($array);
which gives...
Array
(
[0] =>
[1] =>
[2] => 1
[3] => 4
[4] => 6
)
try this:
$arr = [null, null, 1, 4, 6, null, null, null, null];
$arr = array_reverse($arr);
foreach($arr as $a){
if(is_null($a))
array_shift($arr);
else break;
}
$arr = array_reverse($arr);
print_r($arr);
it will give you the result you need:
array:5 [
0 => null
1 => null
2 => 1
3 => 4
4 => 6
]
Another way can be
<?php
$array = [NULL, NULL, 1, 4, 6, NULL, NULL, NULL, NULL];
function trimRight($array) {
$arr = $array;
for ($i = count($array)-1; $i >= 0; $i--) {
if( !is_null($array[$i])) {
$arr = $array;
} else {
unset($array[$i]);
}
}
return $arr;
}
var_dump(trimRight($array));
?>
Output
array(5) { [0]=> NULL [1]=> NULL [2]=> int(1) [3]=> int(4) [4]=> int(6) }
