php - Count the total occurrences of each unique word in a flat array of multi-word elements ← (PHP)
Input array:
$array = [
'Mary',
'Mary had a little',
'a lamb',
'Mary mary mary',
'lady'
];
Desired output:
[
'Mary' => 5,
'a' => 2,
'had' = 1,
'little' => 1,
'lady' => 1
]
Answer
Solution:
<?php
$array=array(
0 => 'Mary',
1 => 'Mary had a little',
2 => 'a lamb',
3 => 'Mary mary mary',
4 => 'lady'
);
$data=array();
foreach($array as $sentence)
{
//gatering words in an array by spliting the sentence on space.
$data= array_merge($data,explode(" ", $sentence));
}
//counting values present in array for case sensitive
$result=array_count_values($data);
print_r($result); //Result 1
//counting values present in array for case insensitive by changing each array element to lowercase
$result=array_count_values(array_map("strtolower", $data));
print_r($result); //Result 2
Output:
//result 1
Array
(
[Mary] => 3
[had] => 1
[a] => 2
[little] => 1
[lamb] => 1
[mary] => 2
[lady] => 1
)
//result 2
Array
(
[mary] => 5
[had] => 1
[a] => 2
[little] => 1
[lamb] => 1
[lady] => 1
)
Answer
Solution:
It is inefficient to make iterated calls of explode() and array_merge(). Just let implode() condense the data into a string, reduce the case, convert back to a 1-dimensional array, then count. Easy.
Code: (Demo)
$array = [
'Mary',
'Mary had a little',
'a lamb',
'Mary mary mary',
'lady'
];
var_export(
array_count_values(
explode(' ',
strtolower(
implode(' ', $array)
)
)
)
);
Output:
array (
'mary' => 5,
'had' => 1,
'a' => 2,
'little' => 1,
'lamb' => 1,
'lady' => 1,
)