原创 php中round、floor、ceil的用法
round（）對浮點數進行四捨五入 float round( float $val[,int $precision = 0[, int $mode = PHP_ROUND_HALF_UP]] )； 返回將 val 根據指定精度p
2018-09-11 05:01:37
原创 call to member function bind_param() on boolean...........
Fatal error: Uncaught Error: Call to a member function bind_param() on boolean in .... Stack trace: #0 {main} thrown in.
2018-09-11 05:01:37
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