为什么在 php 中进行数据库转储时需要提供完整的 mysqldump 路径

Question

I am trying to create a mysql database dump in a php class.

I am executing the following code but only an empty dump file will create. But the same command works fine when I execute it in the command line.

$script = 'mysqldump -h ' . DB_HOST . ' -u ' . DB_USER . ' -p' . DB_PASSWORD . ' ' . DB_NAME . ' > ' . DB_DUMP_PATH . 'mysql-db-dump-' . date('Y-m-d') . '.sql';
exec($script);

But when I give the full path of mysqldump, the dump file create correctly.

$script = '/usr/local/mysql/bin/mysqldump -h ' . DB_HOST . ' -u ' . DB_USER . ' -p' . DB_PASSWORD . ' ' . DB_NAME . ' > ' . DB_DUMP_PATH . 'mysql-db-dump-' . date('Y-m-d') . '.sql';
exec($script);

But I saw most of the tutorials, they just use mysqldump command. Not the full path. What is the reason behind this? I am planing to use this in both unix and windows environment.

Is it possible to get the mysqldump path in php for both environments?

Answer 1

您可以通过将mysqldump和mysql命令从/usr/local/mysql/bin/复制到/usr/bin/路径来避免路径。