Sharing solutions to problems that arise when PHP returns values ​​recursively_PHP Tutorial

We are using This is what we started writing:

1. ?php
2. function test($i)
3. {
4. $i -= 4;
5. if($i 3)
6. {
7. return $i;
8. }
9. else
10. {
11. test($i);
12. }
13. }
14. echo test(30);
15. ?>

This code looks fine, but in fact there is an else There is something wrong inside. The test executed here has no return value. Therefore, even if the condition $i

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php  </span></span></span></li>
<li><span>function test($i)  </span></li>
<li class="alt"><span>{  </span></li>
<li>
<span>$i </span><span class="attribute">-</span><span>= </span><span class="attribute-value">4</span><span>;  </span>
</li>
<li class="alt">
<span>if($i </span><span class="tag"><span> </span><span class="tag-name">3</span><span>)  </span></span>
</li>
<li><span>{  </span></li>
<li class="alt"><span>return $i;  </span></li>
<li><span>}  </span></li>
<li class="alt"><span>else   </span></li>
<li><span>{  </span></li>
<li class="alt"><span>return test($i); //增加return, 让函数返回值  </span></li>
<li><span>}  </span></li>
<li class="alt"><span>}  </span></li>
<li><span>echo test(30);  </span></li>
<li class="alt">
<span class="tag">?></span><span> </span>
</li>
</ol>

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

http://www.bkjia.com/PHPjc/446281.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446281.htmlTechArticleWe are using this to start writing: ?php functiontest($i) { $i - = 4; if ($i 3 ) { return$i; } else { test($i); } } echotest(30); ? This code seems to have no problem, but in fact...