Including Code

Anywhere you are unconditionally including a class file, use require_once. Anywhere you are conditionally including a class file (for example, factory methods), use include_once. Either of these will ensure that class files are included only once. They share the same file list, so you don't need to worry about mixing them - a file included with require_once will not be included again by include_once.

include_once and require_once are statements, not functions. Parentheses should not surround the subject filename.
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Last updated: Wed, 28 Jan 2015 — Download Documentation
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To change all require_once('foo.php'); to require_once 'foo.php' execute this:

cd /var/www/

find . -name '*.php' -print | xargs egrep -l \
'require_once\s*(\(.*\));'\ | xargs sed -i.sedorig -e \
's/require_once\s*(\(.*\));/require_once \1;/'

(thanks to Robert Hajime Lanning for that)

Then to remove all the ".php.sedorig" backup files execute this:

find . -name "*.php.sedorig" -type f -exec rm -rf {} \;