使用％s和％d的PHP MySQL查询

Question

SELECT COUNT(*) AS test FROM %s WHERE id = %d AND tmp_mail <> ''

%s和%d是什么？

Answer 1

这些是使用的格式符号，例如按sprintf()。例如：

<?php
 $sql_template = "SELECT COUNT(*) AS test FROM %s WHERE id = %d AND tmp_mail <> ''";
 $sql_real = sprintf($sql_template, 'sometable', 12345);
 echo $sql_real;
?>

输出：

SELECT COUNT(*) AS test FROM sometable WHERE id = 12345 AND tmp_mail <> ''

Answer 2

string 和十进制整数可能是format symbols。