How to assign value to array in php loop

In PHP programming, arrays are frequently used data structures, and dynamic operations are achieved by assigning values ​​to arrays. Assigning values ​​to arrays in loops is a common operation. This article will introduce how to assign values ​​to arrays in PHP loops.

First of all, in PHP, you can define an array in the following two ways:

// 方法一：通过array()函数定义数组
$arr_one = array(1, 2, 3);

// 方法二：通过[]操作符定义数组(php5.4以后支持)
$arr_two = [4, 5, 6];

After we have the array, we need to assign it in the loop. First, we need to know the basic syntax and usage of loop statements in PHP. This article introduces three commonly used loop statements: for loop, while loop and foreach loop.

1. for loop

The for loop is one of the most commonly used loop statements, which can execute a specified number of loops. The sample code is as follows:

// for循环语法
for($i = 0; $i < 3; $i++) {
    // 循环体
}

// for循环中给数组赋值
$arr = array(); // 定义空数组
for($i = 0; $i < 3; $i++) {
    $arr[$i] = $i + 1; // 给数组赋值
}
print_r($arr); // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 )

2. while loop

The while loop is a loop statement with an indefinite number of loops that can be executed cyclically according to specified conditions. The sample code is as follows:

// while循环语法
while(条件) {
    // 循环体
}

// while循环中给数组赋值
$arr = array(); // 定义空数组
$i = 0;
while($i < 3) {
    $arr[$i] = $i + 1; //给数组赋值
    $i++; //计数器自增
}
print_r($arr); // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 )

3. foreach loop

The foreach loop is a loop statement that traverses an array and can loop through each element in the array. The sample code is as follows:

// foreach循环语法
foreach($arr as $key => $value) {
    // 循环体
}

// foreach循环中给数组赋值
$arr = array(); // 定义空数组
foreach([1, 2, 3] as $key => $value) {
    $arr[$key] = $value; //给数组赋值
}
print_r($arr); // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 )

Among the above three loop methods, the syntax for assigning values ​​to the array is similar. The only difference lies in the basic syntax and function of the loop statement itself. In general, assigning values ​​to arrays in PHP loops is a common operation and is widely used in actual programming. According to different situations and needs, you can choose appropriate loop statements and array assignment methods to operate arrays.

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