HOWTO · PHP
PHP Array Sum
This tutorial demonstrates how to sum the values of an array for both single and multidimensional arrays.
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PHP has a built-in function array_sum(), which is used to sum all the values of an array.
This function takes one parameter, the array you want to sum values. It only takes a one-dimensional and associative array as a parameter.
The array_sum() returns an integer or float value after adding all the values; if the array is empty, it will return 0.
This tutorial demonstrates the uses of array_sum() and how to sum the values of a multidimensional array.
Use the array_sum() Function to Sum the Values of an Array in PHP
The array_sum() can only be used for one-dimensional and associative arrays.
// Sum of the values of a one dimensional array.
$sum_array=array(10,20,30,40,50);
echo "Sum of the one-dimensional array is: "
echo array_sum($sum_array);
echo "<br>";
// Sum of the values of one associative array.
$sum_array=array("val1"=>10.5,"val2"=>20.5,"val3"=>30.5,"val4"=>40.5,"val5"=>50.5);
echo "Sum of the associative array is: "
echo array_sum($sum_array);
The above code will sum the values of the corresponding array. In the case of an associative array, the array_sum() will only sum the values, not the keys.
Output:
Sum of the one-dimensional array is: 150
Sum of the associative array is: 152.5
Calculate the Sum of All Values of a Multidimensional Array in PHP
We can use foreach loops for a multidimensional array to calculate the sum of all values.
<?php
$multi_array = [
["val1"=>10,"val2"=>20,"val3"=>30,"val4"=>40,"val5"=>50],
["val1"=>10.5,"val2"=>20.5,"val3"=>30.5,"val4"=>40.5,"val5"=>50.5],
["val1"=>60,"val2"=>70,"val3"=>80,"val4"=>90,"val5"=>100],
["val1"=>60.5,"val2"=>70.5,"val3"=>80.5,"val4"=>90.5,"val5"=>100.5]
];
$sum_array = array();
foreach ($multi_array as $k=>$sub_array) {
foreach ($sub_array as $id=>$val) {
$sum_array[$id]+=$val;
}
}
print "Sum of full Array : ".array_sum($sum_array)."<br/>";
?>
The code above will first calculate the sum of columns of a multidimensional array and return an array with the sum of columns values. Then we use sum_array() function.
Output:
Sum of full Array : 1105
Calculate the Sum of a Particular Column of a Multidimensional Array Using sum_array() Function in PHP
As we know, sum_array() cannot return the sum of a multidimensional array, but it can be used with another built-in function, array_column().
The array_column() will return an array with keys and values with a column from the given multidimensional array. It takes two mandatory parameters, the array and column or index key.
<?php
$multi_array = [
["val1"=>10,"val2"=>20,"val3"=>30,"val4"=>40,"val5"=>50],
["val1"=>10.5,"val2"=>20.5,"val3"=>30.5,"val4"=>40.5,"val5"=>50.5],
["val1"=>60,"val2"=>70,"val3"=>80,"val4"=>90,"val5"=>100],
["val1"=>60.5,"val2"=>70.5,"val3"=>80.5,"val4"=>90.5,"val5"=>100.5]
];
$sum_val1 = array_sum(array_column($multi_array, "val1"));
print "Sum of column val1 : ".$sum_val1."<br/>";
$sum_val2 = array_sum(array_column($multi_array, "val2"));
print "Sum of column val2 : ".$sum_val2."<br/>";
$sum_val3 = array_sum(array_column($multi_array, "val3"));
print "Sum of column val3 : ".$sum_val3."<br/>";
$sum_val4 = array_sum(array_column($multi_array, "val4"));
print "Sum of column val4 : ".$sum_val4."<br/>";
$sum_val5 = array_sum(array_column($multi_array, "val5"));
print "Sum of column val5 : ".$sum_val5."<br/>";
?>
Output:
Sum of column val1 : 141
Sum of column val2 : 181
Sum of column val3 : 221
Sum of column val4 : 261
Sum of column val5 : 301
We can also use loops with array_sum and array_column() functions to calculate the sum of all values of a multidimensional array.
