function getCode($appKey, $appSecret, $callback_url)
{
$getCodeUrl = "https://gw.api.alibaba.com/auth/authorize.htm?client_id=" . $appKey . "&site=aliexpress&redirect_uri=" . $callback_url . "&_aop_signature=" . Sign(array('client_id' => $appKey, 'redirect_uri' => $callback_url, 'site' => 'aliexpress'), $appSecret);
return "<a href='" . $getCodeUrl . "'>Login</a>";
}
<?php
/**
* Write an integer function Sign(X) that returns the following value:
* −1, if X < 0; 0, if X = 0; 1, if X > 0
* (X is a real-valued parameter). Using this function,
* evaluate an expression Sign(A) + Sign(B) for given real numbers A and B.
*/
function Sign($X)
{
if ($X < 0) {
return -1;
} elseif ($X == 0) {
return 0;
} else {
return 1;
}
}
$var1 = Sign(10);
$var2 = Sign(-10);
echo 'the result is :' . ($var1 + $var2);
