How update a config file with a bash script? - bash

Question

When launching an AWS EC2 instance you can specify User Data.
I would like to create a bash script that automatically updates the file /etc/httpd/conf/httpd.conf like follow:
Update 1:
<IfModule mime_module>
### Original content ###
AddType application/x-httpd-php .php # ← Add
</IfModule>
Update 2:
<Directory "/var/www/html">
### Original content ###
#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# Options FileInfo AuthConfig Limit
#
# AllowOverride None # ← Before
AllowOverride All # ← Update
### Original content ###
</Directory>
How to do that ? And what do you think is the best way to do that?
I don't know bash well enough so I'm considering using the php command to do that (php -r). Is it a bad idea?
Regards
Edit: this is the php command
#!/bin/bash
php -r '$filename = "/etc/httpd/conf/httpd.conf";
$content = file_get_contents($filename);
$pattern = "/<IfModule mime_module>([\S\s]*?)<\/IfModule>/";
preg_match($pattern, $content, $matches);
$matches[1] = "<IfModule mime_module>\n$matches[1] AddType application/x-httpd-php .php\n</IfModule>";
$content = str_replace($matches[0], $matches[1], $content);
$pattern = "/<Directory \"\/var\/www\/html\">([\S\s]*?)<\/Directory>/";
preg_match($pattern, $content, $matches);
$matches[1] = str_replace("AllowOverride None", "AllowOverride All", $matches[1]);
$content = "<Directory \"/var/www/html\">".str_replace($matches[0], $matches[1], $content)."</Directory>";
file_put_contents($filename, $content);';
I want to do the same thing without php command (only with bash script)

Answer 1

Override the whole httpd.conf file. It is easier and faster