slice 2d array in php - php

Question

Is there a way to slice 2d array when all column are all zeros? TIA
$cars = array(
array('Cars', 0, 18, 2, 4, 0, 3, 0, 8),
array('BMW', 0, 13, 2, 4, 0, 3, 0, 8),
array('Saab', 0, 29, 2, 4, 0, 3, 0, 8),
array('Land Rover', 0, 15, 2, 4, 0, 3, 0, 8),
);
echo '<table border="1">';
foreach ($cars as $car) {
echo '<tr>';
foreach ($car as $key) {
echo '<td>'.$key.'</td>';
}
echo '</tr>';
}
echo '</table>';

Answer 1

The following code will remove the columns if every value in the column has the value 0. If you had other plans such as slicing you still can use the code to help you identify what you want.
I do this before actually printing out the array as I do not simply know of a function to do this, so you'd have to create one.
The function array_column() is used to retrieve the columns and I compare it against array_intersect() that returns the rows with the same value and compare that against the amount of rows in your table.
$cols = count($cars[0]);
$rows = count($cars);
$filter = [0]; // add more unwanted values if you please
for($col=1; $col<$cols; $col++){ // skip index 0
if(count(array_intersect(array_column($cars, $col), $filter))) == $rows){
// We found a column "$col" where every value is "0".
foreach($cars as $k => $arr){
// Looping over the main array.
unset($arr[$col]); // unset the cloned array.
$cars[$k] = $arr; // update the original array with new value.
}
}
}
Now you can print your table with the same code you had.