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run code in 200+ php & hhvm versions
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<?php $str = preg_replace('/(\w)(.)?/e', "strtoupper('$1').strtolower('$2')", 'test example.Hello World'); echo $str; ?>
based on OlYjD
Output for 7.0.0 - 7.2.0
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/HlpER on line 2
Output for 5.5.24 - 5.6.28
Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /in/HlpER on line 2 TeSt ExAmPlE.HeLlO WoRlD
Output for 5.3.19 - 5.4.45
TeSt ExAmPlE.HeLlO WoRlD