带有 %s 和 %d 的 PHP MySQL 查询

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时间:2020-08-25 00:29:24  来源:igfitidea点击:

PHP MySQL query with %s and %d

phpmysql

提问by Delirium tremens

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

What are %sand %dfor?

是什么%s%d为了什么?

回答by Piskvor left the building

Those are format symbols used e.g. by sprintf(). Example:

这些是使用的格式符号,例如sprintf(). 例子:

<?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;
?>

Output:

输出:

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

回答by Gumbo

That are probably format symbolsfor stringand decimal integer.

那可能是stringdecimal integer 的格式符号