php - Strange behaviour on $get parameter. -


this question has answer here:

i'm getting following error "notice: undefined index:" on 'name' => $_get['channel'].

when there's parameter works , allows loop proceed, when there's no parameter set error above.

if try isset removes error stops wordpress loop proceeding if parameter set.

what missing?

<?php $args = array ( 'post_type' => 'abc_channels', 'name' => $_get['channel'], 'post_status' => 'publish', 'posts_per_page' => 1, );      $loop = new wp_query( $args );      // if have live channels      if (isset($_get['channel'])) :      if($loop->have_posts()):       while($loop->have_posts()): $loop->the_post();      ?>

thanks @aynber pointing me solution.

<?php $channelvalue = ""; //initialization value; examples //"" when want append stuff later //0  when want add numbers later //isset() $channelvalue = isset($_get['channel']) ? $_get['channel'] : ''; //empty() $channelvalue = !empty($_get['channel']) ? $_get['channel'] : ''; ?>  <?php     $args = array (     'post_type' => 'abc_channels',     'name' => $channelvalue,     'post_status' => 'publish',     'posts_per_page' => 1,     );      $loop = new wp_query( $args );      // if have live channels      if (isset($_get['channel'])) :      if($loop->have_posts()):       while($loop->have_posts()): $loop->the_post();      ?>

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