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How to defined user role to access plugin's pages in wordpress?

+4 votes
How to defined user role to access plugin's pages in wordpress?
posted Aug 7, 2015 by Vrije Mani Upadhyay

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I have a button in my wordpress website that popup a gallery, my problem is that the gallery is loading the image from the code, so when my clients need to upload a new image I need to add it for him in the code. How can I make it?
Here is the code:

<!DOCTYPE html>

<img class="alignnone size-full wp-image-133 aligncenter" style="border: 5px solid white; border-radius: 50%; background: white; box-shadow: 1px 1px 5px gray;" src="" alt="" width="72" height="72" onclick="openModal();currentSlide(1)" class="hover-shadow cursor"><strong>try</strong>

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      <img src="" style="width:100%">

    <div class="mySlides">
      <div class="numbertext">2 / 4</div>
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    <a class="prev" onclick="plusSlides(-1)">❮</a>
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    <div class="caption-container">
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function openModal() {
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function closeModal() {
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var slideIndex = 1;

function plusSlides(n) {
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function currentSlide(n) {
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+1 vote

I am trying to get the current user in WordPress. My code is in below:

    $current_user = wp_get_current_user(); 
    echo 'Username: ' . $current_user->user_login;

but I get the following error:

Fatal error: Call to undefined function wp_get_current_user() in /membri/mysite/wordpress/getUser.php on line 3

How can I resolve it?

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