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Recently I wanted to find the transpose of an array. But there is no inbuilt function for doing that. This code can find the transpose of a 2D array. If an optional second parameter is passed, then the function returns that row of the new matrix.
| <?php
function array_transpose($array, $selectKey = false) {
if (!is_array($array)) return false;
$return = array();
foreach($array as $key => $value) {
if (!is_array($value)) return $array;
if ($selectKey) {
if (isset($value[$selectKey])) $return[] = $value[$selectKey];
} else {
foreach ($value as $key2 => $value2) {
$return[$key2][$key] = $value2;
}
}
}
return $return;
}
$fruits = array(
array('id' => 1, 'name' => 'Apple', 'color' => 'Red'),
array('id' => 2, 'name' => 'Orange', 'color' => 'Orange'),
array('id' => 3, 'name' => 'Mango', 'color' => 'Yellow')
);
print_r(array_transpose($fruits));
print_r(array_transpose($fruits, 'name'));
?> | |
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