php 读取二维数组

<?php
// 定义一个二维数组
$matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

// 遍历二维数组
foreach ($matrix as $rowIndex => $row) {
    foreach ($row as $colIndex => $value) {
        echo "Element at row $rowIndex, column $colIndex: $value\n";
    }
}
?>

<?php
// 确保数组已经正确初始化
$matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

// 检查索引范围
if (isset($matrix[$rowIndex]) && isset($matrix[$rowIndex][$colIndex])) {
    echo "Element at row $rowIndex, column $colIndex: " . $matrix[$rowIndex][$colIndex] . "\n";
} else {
    echo "Index out of bounds\n";
}
?>

<?php
// 动态添加行
$matrix[] = [10, 11, 12];

// 动态删除行
unset($matrix[0]);

// 动态添加列
foreach ($matrix as &$row) {
    $row[] = 13;
}

// 动态删除列
foreach ($matrix as &$row) {
    unset($row[0]);
}
?>