Summarize array in PHP - php

Question

I'm mainly programming in language that used for business systems, and there is a useful built-in function that can sum an array. For example, we've got array like this:
red | 1
red | 1
green | 1
orange | 2
orange | 1
orange | 1
blue | 1
After using summarizing function we get
red | 2
green | 1
orange | 4
blue | 1
Is it equivalent function in php?
UPD.
$array = array('red'=>1,'red'=>2,'green'=>1....);

Answer 1

In php
red | 1
red | 1
green | 1
orange | 2
orange | 1
orange | 1
blue | 1
This kind of array is not possible. PHP array can not have multiple index keys with the same name. It will override the previous one.

Answer 2

As said, an array like
array('red'=>1,'red'=>2,'green'=>1....);
is not possible. Try it and make a print_r. You will see that there is only one red entry with value 2 (or what ever the last value is). The last one will overwrite the previous ones.
Depending on how you create the array, you can either sum the value on the fly, e.g.
for(...) {
if(!isset($array[$color])) {
$array[$color] = 0;
}
$array[$color] += $value;
}
or create a multidimensional array:
$array = array(
'red'=> array(1,2),
'green'=> array(1),
...
);
You can then array_map to loop over it and compute the sums of each entry with array_sum:
$newarray = array_map('array_sum', $array);

Answer 3

Your initial array should contain only values. You can use array_values() for that. After that you can count the values with array_count_values()
http://php.net/manual/en/function.array-count-values.php

Answer 4

supposed you have array like this:
$array = array(
'red | 1',
'red | 1',
'green | 1',
'orange | 2',
'orange | 1',
'orange | 1',
'blue | 1'
);
You can process it this way:
<?php
//process the array data
$temp_output = array();
foreach( $array as $raw)
{
list($name, $value) = array_map('trim', explode("|", $raw));
if( !isset($temp_output[ $name ] ) )
$temp_output[ $name ] = (int)$value;
else
$temp_output[ $name ] += (int)$value;
}
//now, print the value
foreach( $temp_output as $key => $data)
{
echo "{$key} | {$data}\n";
}
?>