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run code in 200+ php & hhvm versions
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<?php \ var_dump(htmlspecialchars("<>\'\"&"));
Output for 5.3.0 - 7.2.0
string(21) "&lt;&gt;\'&quot;&amp;"
Output for 4.3.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/1OXoB on line 2 string(21) "&lt;&gt;\'&quot;&amp;"