为啥回调函数在array_filter()里面没有起作用

为什么回调函数在array_filter()里面没有起作用？

<br />	<?php<br />		function myFunction($v) <br />		{<br />		if ($v==="Dog")<br />			{<br />				return "Fido";<br />			}<br />				return $v;<br />		}<br />		$a=array("Horse","Dog","Cat");<br />		//Array ( [0] => Horse [1] => Fido [2] => Cat ) <br />		print_r(array_map("myFunction",$a)); <br />		<br />		//Array ( [0] => Horse [1] => Dog [2] => Cat )<br />		//为什么回调函数在array_filter()里面没有起作用？<br />		print_r(array_filter($a,"myFunction"));<br />	 ?><br />

array_filter() 回调函数

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------解决方案--------------------
去看下array_filter 的用法就会明白
------解决方案--------------------

function myFunction($v) <br />    {<br />    if ($v==="Dog")<br />        {<br />            return true;<br />        }<br />            return false;<br />    }<br />    $a=array("Horse","Dog","Cat");<br />    //Array ( [0] => Horse [1] => Fido [2] => Cat ) <br />    print_r(array_map("myFunction",$a)); <br />     <br />    //Array ( [0] => Horse [1] => Dog [2] => Cat )<br />    //为什么回调函数在array_filter()里面没有起作用？<br />    print_r(array_filter($a,"myFunction"));