PHP implements Xiaomi 3 availability detection and then sends email

I wanted to buy the Xiaomi Mi 3 telecom version today, but it was sold out every time it was shipped, so I did a simple check to see if it was in stock.

Then I successfully grabbed the white telecom version of Xiaomi Mi 3 today.

The arrays inside are for different versions. I only want the telecom version, so I wrote down three simple judgments

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, "http://www.mi.com/buyphone/mi3");
curl_setopt($curl, CURLOPT_HEADER, 0 );
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$data = curl_exec($curl);
curl_close($curl);
preg_match_all("/isLack:(.*),/",$data,$out );
if($out[1][24]=='false'){
 mail("admin@qq.com","Xiaomi 3 black telecom version is in stock","Purchase address http://order .mi.com/event/selectPacket/goodsid/2140800022");
}else{
 echo "Wait";
}

if($out[1][23]=='false'){
 mail(" admin@qq.com","Xiaomi 3 white telecom version is in stock","Purchase address http://order.mi.com/event/selectPacket/goodsid/2141000021");
}else{
 echo "Wait" ;
}

if($out[1][25]=='false'){
 echo "Buy";
 mail("admin@qq.com","Xiaomi 3 Silver Telecom Edition is in stock", "Purchase address http://order.mi.com/event/selectPacket/goodsid/2141300016");
}else{
 echo "Wait";
}