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<?php echo '<pre>'; var_dump(htmlentities('á, í, ã, ô'));
Output for 5.4.0 - 7.1.7
<pre>string(37) "&aacute;, &iacute;, &atilde;, &ocirc;"
Output for 4.3.0 - 5.3.29
<pre>string(64) "&Atilde;&iexcl;, &Atilde;&shy;, &Atilde;&pound;, &Atilde;&acute;"