How to read/write form/into certain place in a text file

From: Date: Mon, 07 Jan 2002 01:56:03 +0000
Subject: How to read/write form/into certain place in a text file
Groups: php.general 
Request: Send a blank email to php-general+get-79632@lists.php.net to get a copy of this message
hi, A text file has been formatted ,how to read/write form/into certain place in a text file. For example,read form letter 5 to 10 in line 4 ,and after some procedure ,write into the same place. Another question is that if a user has opened the file to read and write , what will happen if another one will open and write the same file? Thank you in advance. Leon

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