php - how to store values in session properly -


i have these pages asks user values. when try use links previous pages, session values gone , requires user go first , repeat process.

here sample codes based of original code:

page1.php

<?php  session_start();  echo "<form method='post' action='page2.php'>";     echo "<input type='text' name='date1'>";     echo "<input type='text' name='date2'>";     echo "<input type='submit'>"  echo "</form>"; ?>

page2.php

<?php  session_start();  $_session['date1'] = $_post['date1'];  $_session['date2'] = $_post['date2'];       echo "<form method='post' action='page3.php'>";         echo "<input type='text' name='info1'>";         echo "<input type='text' name='info2'>";         echo "<input type='submit'>"      echo "</form>"; echo "<a href='page1.php'>change value in page 1</a>"; ?>

page3.php

<?php  session_start();  $_session['info1'] = $_post['info1'];  $_session['info2'] = $_post['info2'];  if(isset($_post['confirm'])){ $mysql_host = 'localhost'; $mysql_user = 'root'; $mysql_pass = ''; $db = 'sampdb';  $conn = mysqli_connect($mysql_host, $mysql_user, $mysql_pass, $db);  $query = mysqli_query($conn, 'insert info(date1, date2, info1, info2)                                value ('$_session[date1]', '$_session[date2]', '$_session[info1]', '$_session[info2]')');  }       echo "<form method='post'>";         echo $_session['date1'];         echo $_session['date2'];         echo $_session['info1'];         echo $_session['info2'];         echo "<input type='submit' name='confirm'>"      echo "</form>"; echo "<a href='page1.php'>change value in page 1</a>"; echo "<a href='page2.php'>change value in page 2</a>"; ?>

how go previos pages without destroying values session?

as long you're not $_posting values other pages, can check if $_post set before overwriting values, so:

session_start(); if(isset($_post["date1"])) $_session['date1'] = $_post['date1']; if(isset($_post["date2"])) $_session['date2'] = $_post['date2'];

reference: php isset


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