Supported Versions
http://php.net/supported-versions.php

show PHP information
php -i

list loaded PHP modules
php -m

enable PHP Module
php5enmod amqp
/etc/init.d/apache2 reload

Show includes
php --ini

Run PHP built-in web server
php -S 192.168.1.100:8080 -t /var/www/

PHP syntax check
php -l FILE.php

# define parameter

php -d date.timezone="Europe/Berlin" -f

Error reporting

# report all errors except notices

http://php.net/manual/en/function.error-reporting.php
error_reporting = E_ALL & ~E_NOTICE

#syntax check
find . -type f -name "*.php" -exec php -l {} \; | grep -v 'No syntax errors'

# PHP_CodeSniffer

http://pear.php.net/manual/en/package.php.php-codesniffer.usage.php

# Debian: compile and install multiple PHP cli versions

http://www.panticz.de/Debian-compile-and-install-multiple-PHP-versions

convert line break to html

echo nl2br($content)

Calculate PHP error reporting
php_admin_value error_reporting 31735
http://www.bx.com.au/tools/ultimate-php-error-reporting-wizard?php_version=5_4

# search for short_open_tag
grep -RlIP '^<\?\n' *