sudoers syntax to run shell script as php user?

I want to run

• a shell script restore
• as postgres user
• from php script (the user name is php)
• using sudo
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the script will have few lines of code, something like

dropdb <database name>
psql -c "create database <database name> with encoding 'unicode';" -U edutemplate1
psql -d <database name> -f edu.hourly.sql 

• what would be the sudo command syntax to run the script restore
• what would be the sudoers syntax to allow php user to run restore script as postgres user?

The command is absolutely the same as you do in console:

sudo -u db1inst1 /path/to/script.sh

Or even:

system('sudo -u db1inst1 /path/to/script.sh');

or

`sudo -u db1inst1 /path/to/script.sh`