PHP Exercises: Group the elements of an array based on the given function
PHP: Exercise-83 with Solution
Write a PHP program to group the elements of an array based on the given function.
Sample Solution: -
PHP Code:
<?php
// License: https://bit.ly/2CFA5XY
function groupBy($items, $func)
{
$group = [];
foreach ($items as $item) {
if ((!is_string($func) && is_callable($func)) || function_exists($func)) {
$key = call_user_func($func, $item);
$group[$key][] = $item;
} elseif (is_object($item)) {
$group[$item->{$func}][] = $item;
} elseif (isset($item[$func])) {
$group[$item[$func]][] = $item;
}
}
return $group;
}
print_r(groupBy(['one', 'two', 'three', 'four'], 'strlen'));
?>
Sample Output:
Array ( [3] => Array ( [0] => one [1] => two ) [5] => Array ( [0] => three ) [4] => Array ( [0] => four ) )
Flowchart:

PHP Code Editor:
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Previous: Write a PHP program to get the index of the last element for which the given function returns a truth value.
Next: Write a PHP program to check a flat list for duplicate values. Returns true if duplicate values exists and false if values are all unique.
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