Java ArrayList equivalent for PHP

Question

I'm preparing a strassen matrix algorithm using PHP. I've googled and found some similar projects in other languages like python, java ,... Since in my opinion Java is most similar to PHP, I decided to turn the Java code to PHP. I turned the whole java code to PHP except the following part. I don't understand the meaning of < and >> symbols and what they do in this code. Any Idea?

public static int[][] strassen(ArrayList<ArrayList<Integer>> A,
        ArrayList<ArrayList<Integer>> B) {
    // Make the matrices bigger so that you can apply the strassen
    // algorithm recursively without having to deal with odd
    // matrix sizes
    int n = A.size();
    int m = nextPowerOfTwo(n);
    int[][] APrep = new int[m][m];
    int[][] BPrep = new int[m][m];
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            APrep[i][j] = A.get(i).get(j);
            BPrep[i][j] = B.get(i).get(j);
        }
    }

    int[][] CPrep = strassenR(APrep, BPrep);
    int[][] C = new int[n][n];
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            C[i][j] = CPrep[i][j];
        }
    }
    return C;
}

you can see the original code here

Answer 1

These are ArrayList , and the closest PHP likeness to the ArrayList class from Java is the ArrayObject class. The method names are different, but the functionality between the two is fairly close.