crul_init()方法未定义,php.ini已经配置了

<?php
$url="http://localhost/empmanagement.php";
$postdate=array(
"Account"=>"1111",
"PWD"=>"1111",
);
$ch=curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_POSTFIELDS,$postdate);
curl_exec($ch);
curl_close($ch);
?>