Solutions to problems that occur when PHP returns values ​​recursively_PHP Tutorial

When we use PHP recursion, we will encounter various problems. The more distressing ones are the problems that arise when PHP recursion returns values. In fact, if you think about it carefully, this is a very simple question. But it was this simple question that troubled me for half the afternoon. The problem is with the return value of the recursive function.

This is what I started writing:

Copy the code The code is as follows:

function test ($i)
{
$i -= 4;
if($i < 3)
{
return $i;
}
else
{
test($i);
}
}
echo test(30); In fact, there is a problem in else. The test executed here has no return value. Therefore, even if the condition $i <3 is met and return $i is returned, the entire function will not return a value. Make the following modifications to the above PHP recursive return value function:

Copy the code

The code is as follows: < ?php function test($i)

{

$i -= 4;
if($i < 3)
{
return $i;
}
else
{
return test($i); //Add return to let the function return a value
}
}
echo test(30);
?>


The above code example is the specific solution when there is a problem with PHP's recursive return value.

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truehttp: //www.bkjia.com/PHPjc/326594.htmlTechArticleWhen we use PHP recursion, we will encounter various problems, the most distressing of which is Regarding the problem that occurs when PHP returns a value recursively. Actually, if you think about it carefully, this is a very simple question...