支付宝 APP 支付签名问题？
支付宝文档
这里的签名函数，如果用PHP 实现的话，是应该用
<code>openssl_private_encrypt()</code>
还是用
<code>openssl_sign()</code>
回复内容：
支付宝文档
这里的签名函数，如果用PHP 实现的话，是应该用
<code>openssl_private_encrypt()</code>
还是用
<code>openssl_sign()</code>
使用openssl_sign来计算签名。
openssl_private_encrypt只是加密方法，不含签名算法，而openssl_sign是用来签名的函数。
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