帮忙看下如何会返回null -PHP Tutorial-php.cn

帮忙看下如何会返回null

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Release： 2016-06-13 12:46:23

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帮忙看下怎么会返回null

本帖最后由 snowlove 于 2013-06-17 18:27:34 编辑

<?php<br />
function newtripos($str,$findstr,$count,$off=0){<br />
	$pos=stripos($str,$findstr,$off);<br />
	$count--;<br />
	if($count>0 && $pos!=false){<br />
		$pos=newtripos($str,$findstr,$count,$pos+1);<br />
	}else{<br />
		var_dump($pos);<br />
		return $pos;<br />
	}<br />
}<br />
$a="456123456455654466";<br />
$b=newtripos($a,'6',4);<br />
var_dump($b);<br />
?>

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执行后显示$b是null。而在函数返回前，执行的var_dump($pos)，显示是int(16)。
为什么var_dump($b)会是null？

Related labels：

count nbsp pos

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