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 />
