mysql_num_rows 0

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mysql_num_rows 0

PHP mysql_num_rows 函式用來統計MySQL SELECT 結果集的行數,當PHP ... 行數,請使用mysql_affected_rows 函式,不過mysql_affected_rows 在MySQL 5.5.0 ... ,Count will return a value, and you cannot count and then call mysql_num_rows. It is either one of the other. You could do $isExist = mysql_query("Select ... ,There's nothing obviously wrong with your code. The most obvious explanation is that the query being submitted to the database is not returning any rows. , There's nothing wrong with your query, but there is something wrong with your error reporting. For example, the following line:

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mysql_num_rows 0 相關參考資料
mysql_num_rows 函式- Wibibi

PHP mysql_num_rows 函式用來統計MySQL SELECT 結果集的行數,當PHP ... 行數,請使用mysql_affected_rows 函式,不過mysql_affected_rows 在MySQL 5.5.0 ...

https://www.wibibi.com

If mysql_num_rows equals to ZERO is NOT working - Stack Overflow

Count will return a value, and you cannot count and then call mysql_num_rows. It is either one of the other. You could do $isExist = mysql_query("Select ...

https://stackoverflow.com

mysql_num_rows() returning 0 - Stack Overflow

There's nothing obviously wrong with your code. The most obvious explanation is that the query being submitted to the database is not returning any rows.

https://stackoverflow.com

mysql_num_rows() returns zero - Stack Overflow

There's nothing wrong with your query, but there is something wrong with your error reporting. For example, the following line:

https://stackoverflow.com