perl -pi -e 's#search_string#replace_string#g' *.php
Here, the -p switch wraps the script inside a loop, executing once for each input file which is denoted by the last arguement *.php.
The -i switch allows inline modification of the file; you can optionally save a backup of the original file by providing the backup file name template after this switch as -i *.bak.
The -e switch executes the following piece of code.
The string of code 's#search_string#replace_string#g' searches for search_string and replaces it with replace_string globally. You can use any other character like "/" to delimit the search & replace strings. Remember to replace the place-holder text with the actual text and also escape it properly.
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