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run code in 200+ php & hhvm versions
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<?php $tag_value="\asdf"; $tag_value = preg_replace('/\{(.*?)\}/e', '$values[\\1]', $tag_value); echo $tag_value; ?>
Output for 7.0.0 - 7.2.11
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/QESvO on line 3
Output for 5.5.0 - 5.6.28
Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /in/QESvO on line 3 \asdf
Output for 4.3.0 - 5.4.45
\asdf