PHP Stack Array Push & Pop -

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ive been trying create navigation system project have been working on. i've been stuck while now, feel i'm on right track.

i want know how make when user selects sql1.php removed $phpfiles same page wont appear again href. it's set random, fine want, never want user see same link twice.

<?php $currentpage = $_server["php_self"]; $nextpage; $prevpage;  $phpfiles = array();  $phpfilesprevious = array();   $phpfiles[] = 'sql1.php'; $phpfiles[] = 'sql2.php'; $phpfiles[] = 'sql3.php'; $phpfiles[] = 'sql4.php'; $phpfiles[] = 'sql5_1.php'; $phpfiles[] = 'sql6.php'; $phpfiles[] = 'sql7.php'; $phpfiles[] = 'sql8.php'; $phpfiles[] = 'sql9.php';    $phpfiles[] = 'sql10.php';         $nextpage=$phpfiles[rand(0, count($phpfiles)-1)];   $prevpage=$currentpage;   $currentpage=$nextpage;   array_push($phpfilesprevious, $currentpage);   array_push($phpfilesprevious, $prevpage);   unset($phpfiles[$nextpage]);  $prevpage=array_pop($phpfilesprevious);  array_push($phpfiles, $prevpage);  function push($phpfiles, $currentpage, $nextpage) {    array_push($phpfiles, $currentpage);   unset($phpfiles[$nextpage]);  }  if(isset($_post['next'])) { echo $nextpage; echo $prevpage; }  if(isset($_get['dec'])) { // decreasing      --$_session['count'];       echo --$_session['count'];         }  $_session["count"]; if ($_session['count'] <=0) { echo '<button><a href="#">current page - ' . $currentpage . '</a> </button>';   echo '<button name = "next" id = "next"> <a href="' . $nextpage . '"">next page - ' . $nextpage . '</a> </button>'; } else if ($_session['count'] < 10) {     echo '<button> <a href="' . $prevpage . '?dec=true" onclick="" class="">previous</a></button>'; echo '<button> <a href="#">current page - ' . $currentpage . '</a> </button>'; echo '<button name = "next" id = "next"> <a href="' . $nextpage . '"">next page - ' . $nextpage . '</a> </button>'; } else { echo '<button> <a href="' . $prevpage . '?dec=true" onclick="" class="">previous</a></button>'; echo '<button> <a href="#">current page - ' . $currentpage . '</a> </button>';      }     ?>


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