The best replacement for php5 is php6.

The best alternatives to php5 are rated as following:
★★★★★  php6
★★★★★  php4

Your alternative for php5 is not listed? Suggest!
Speaking about php5, one probably shouldn't forget about apache2.

Other search terms related to php5 and their ratings are:
★★★★★ apache2
★★ apache 2.2
★ gd
xslt
lighttpd
You have in mind a companion for php5 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of php5 in all years. Click on graph for more.
php5
php6
php4