How to deal with small php file modifications

The PHP file is a small modification to the PHP file added to the txt file to read the database content. how can I write it if I want to add content before or after the read content? For example, the & quot; prefix + content + suffix & quot; plus sign is the omitted PHPcode & lt ;? Php $ cn = mysql_connect ('loca php file small modification
A php file that reads the database content and adds it to the txt file. what should I do if I want to add content before or after the read content? For example, "prefix + content + suffix"
The plus sign is omitted.

PHP code

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PHP code

// Define the value of $ prefix and $ suffix first. to put it bluntly, it is a string connection problem .. Can you write the code without string connection? File_put_contents (paifile_index.'.txt ', $ prefix. $ row [0]. $ suffix. PHP_EOL, FILE_APPEND );