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My Answer:

To sum two rows of numbers from an input file and output the result to a single row in an output file using PHP, you can follow these steps:

1. Read the input file line by line and store the numbers from each row in an array.

2. Sum the corresponding numbers from the two rows and store the result in a new array.

3. Write the sum to the output file.

Here is an example code snippet to achieve this:

`php`

$inputFile = 'input.txt';

$outputFile = 'output.txt';

// Read input file

$lines = file($inputFile, FILE_IGNORE_NEW_LINES);

// Initialize array to store sums

$sums = [];

// Loop through each line in the input file

for ($i = 0; $i < count($lines); $i += 2) {

$row1 = explode(' ', $lines[$i]);

$row2 = explode(' ', $lines[$i + 1]);

// Sum corresponding numbers from two rows

$sum = array_map(function ($a, $b) {

return $a + $b;

}, $row1, $row2);

// Store the sum in the array

$sums[] = implode(' ', $sum);

}

// Write sums to output file

file_put_contents($outputFile, implode("\n", $sums));

In this code snippet, we assume that the input file (`input.txt`) contains numbers separated by spaces in each row. The code reads the input file, sums the corresponding numbers from two rows, and writes the sums to the output file (`output.txt`) in a single row format.

Make sure to adjust the file paths and input file format according to your specific requirements.