I have an html form. How can I get a matrix from it to use it in a php function? I have a js function that does the same thing. But how to do it in php? Can I somehow pass the returned matrix from js to php?

function getInputByMatrix() {
    const rows = document.getElementById('mrow').value;
    let input = [];
    for (let i = 1; i <= rows; i++) {
        input[i-1] = [];
        for (let j = 1; j <= rows; j++) {
            input[i-1][j-1] = document.getElementById(`a${i}${j}`).value;
        }
    }
    return input;
}