How to define a two-dimensional array with several rows and columns in PHP

In PHP, defining a two-dimensional array can be completed with a simple statement. The syntax is as follows:

$array = array(
    array(element1, element2, element3, ..., elementn),
    array(element1, element2, element3, ..., elementn),
    array(element1, element2, element3, ..., elementn),
    ...
    array(element1, element2, element3, ..., elementn)
);

Among them, element is each element in this two-dimensional array. The value can be a number, string, Boolean value, object, etc.

If you want to define a two-dimensional array with n rows and m columns, you can use a nested loop to achieve it:

$rows = n; // 行数
$cols = m; // 列数

$array = array(); // 定义一个空的二维数组

for ($i=0; $i<$rows; $i++) {
    $sub_array = array(); // 定义一个空的一维数组，作为二维数组中的每一行
    for ($j=0; $j<$cols; $j++) {
        $sub_array[] = $element; // 将每一个元素的值赋值给一维数组
    }
    $array[] = $sub_array; // 将一维数组添加到二维数组中
}

In the above code, we first define the rows of the two-dimensional array to be created number and column number, then use two nested loops to assign a value to each element, and finally add each one-dimensional array created to the two-dimensional array.

It is worth noting that in the above code, the value of the $element variable needs to be defined according to specific needs. If you want to define a two-dimensional array in which all elements are 0, you can define it as 0, as shown below:

$rows = n; // 行数
$cols = m; // 列数

$array = array(); // 定义一个空的二维数组

for ($i=0; $i<$rows; $i++) {
    $sub_array = array(); // 定义一个空的一维数组，作为二维数组中的每一行
    for ($j=0; $j<$cols; $j++) {
        $sub_array[] = 0; // 将每一个元素的值赋值为0
    }
    $array[] = $sub_array; // 将一维数组添加到二维数组中
}

In this way, you can get a $n\times m$ in which all elements are 0 A two-dimensional array.

In addition to the above method, you can also use PHP's array_fill() function to achieve assignment to a two-dimensional array, as shown below:

$rows = n; // 行数
$cols = m; // 列数
$element = 0; // 要填充的元素

$array = array_fill(0, $rows, array_fill(0, $cols, $element));

In the above code, we use the array_fill() function Let's first create a one-dimensional array, then use this function to create a two-dimensional array, and use the one-dimensional array as the initial value of each row, and finally get a two-dimensional array of $n\times m$.

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