wordpresss esc_html and its reverse opperation.

esc_html and reverse

esc_html():
It is wordpress function used to convert the html element to html entity. 

Refer the below eg: 
$html = esc_html( '<a href="http://www.example.com/">A link</a>' );

so $html contain 
&lt;a href=&quot;http://www.example.com/&quot;&gt;A link&lt;/a&gt;

The output will display like below. 
<a href="http://www.example.com/">A link</a>

In-order to decode the text from esc_html(), we can use below wp function 
wp_specialchars_decode();

In order to remove the html tags from a string we can use below php function.
strip_tags($text);

In order to remove the esc_html functionality we can use the below filter.
apply_filters( 'esc_html', $safe_text, $text );