Let's say you have a file with a few lines of data.
John Smith 1979 Jane Smith 1984 Jack Jones 1975 Betty Jackson 2001
The following PHP will replace every instance of the string "Smith" with "Johnson" in the file. If the file is on Linux, the file may need 777 permission.
<?php # Load the contents of example.txt into a variable called $myfile $myfile = file_get_contents('example.txt'); # Replace every instance of Smith with Johnson $replacement = str_replace("Smith", "Johnson", $myfile); # Execute the replacement file_put_contents('example.txt', $replacement); ?>
Executing the PHP should update the file to have the following content.
John Johnson 1979 Jane Johnson 1984 Jack Jones 1975 Betty Jackson 2001
The following can be used to do more than once replacement at the same time.
$replacement = str_replace( array("Smith", "Johnson"), array("Betty", "Susan), $myfile);