How to implement factorial algorithm in php

Implementation steps: 1. Define a variable and assign a value of 1 to store the factorial result. The syntax is "$cj=1;"; 2. Use the for statement to loop through the numbers in the range of "1~n" and find Factorial of n, syntax "for ($i = 1; $i

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the for loop to achieve Factorial algorithm.

Implementation steps:

Step 1: Define a variable and assign a value of 1 to store the factorial result

$cj=1;

Step 2: Use the for statement to loop through the numbers in the "1~n" range

If you want to find the factorial of n, you need to traverse the numbers 1~n, so for The initial condition of the loop can be set to i = 1, and the restriction condition can be i or <code>i .

for ($i = 1; $i <= $n; $i++) {
	//循环体代码
}

Step 3: In the loop body, multiply the $i value of each loop and assign it to $cj

$cj *= $i;
//或
$cj = $cj * $i;

Wait until the loop ends After that, the value of variable $cj is the factorial of n, which can be output.

Complete implementation code

function f($n){
	$cj=1;
	for ($i = 1; $i <= $n; $i++) {
		$cj *= $i;
	}
	echo " $n 的阶乘值为： $cj <br>";
}

Call the f() function to find the factorial of 2, 3, and 4

f(2);
f(3);
f(4);

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