javascript - What does %%SOMETEXT%% Mean in PHP form -


today, came php form using variable/constant names or else(i don't know) in following manner

<tr>     <td align="left">email address<br>         <input name="email" type="text" class="cartform" value="%%email%%" size="25">         %%emailrequired%%     </td> </tr> <tr>     <td align="left">first name<br>         <input name="firstname" type="text" class="cartform" value="%%firstname%%" size="25" onchange="setshipping()">         %%firstnamerequired%%     </td> </tr>

can please explain meaning of

value="%%email%%"

it displays added email if session set, i.e behaves assigning value of variable in value attribute, can find variable/constant declared/defined ? in advance.


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