PHP/Cookie Session/Session Variables

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Accessing Session Variables

 
<?php
session_start();
?>
<html>
<head>
<title>Accessing Session Elements</title>
</head>
<body>
<div>
<h1>A Content Page</h1>
<?php
if ( is_array( $_SESSION["products"] ) ) {
  print "<b>Your cart:</b><ol>\n";
  foreach ( $_SESSION["products"] as $p ) {
    print "<li>$p</li>";
  }
  print "</ol>";
}
?>
<a href="indec.php">Back to product choice page</a>
</div>
</body>
</html>



Adding Session Data

 
<?
    $_SESSION["var"] = $val;
    $_SESSION["FirstName"] = "Jim";
?>



A session variable can be destroyed with a call to session_unregister().

 
Its syntax is: boolean session_unregister (string varname)
<?
session_start();
session_register("username");
// ...use the variable $username as needed, then destroy it.
session_unregister("username");
session_destroy();
?>



Checking Session Data

 
<?
    session_start( );
    if (isset($_SESSION["FirstName"])) {
            /// your code here
    }
?>



Reading Session Data

 
<?
    $_SESSION["foo"] = "bar";
    print $_SESSION["foo"];
?>



Registering an Array Variable with a Session

 
<?php
session_start();
if ( empty( $_SESSION["products"] ) ) {
  $_SESSION["products"]=array();
}
if ( is_array( $_REQUEST["form_products"] ) ) {
  $_SESSION["products"] = array_unique(
    array_merge( $_SESSION["products"],
          $_REQUEST["form_products"] )
  );
}
?>
<html>
<head>
<title>Registering an Array Element with a Session</title>
</head>
<body>
<div>
<form action="<?php print $_SERVER["PHP_SELF"]?>" method="post">
<p>
<select name="form_products[]" multiple="multiple" size="3">
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
<option>E</option>
</select>
</p>
<p>
<input type="submit" value="choose" />
</p>
</form>
<a href="index.php">A content page</a>
</div>
</body>
</html>



Registering Variables with a Session

 
<?php
session_start();
?>
<html>
<head>
<title>Registering Variables with a Session</title>
</head>
<body>
<div>
<?php
$_SESSION["product1"] = "A";
$_SESSION["product2"] = "B";
print "The products have been registered";
?>
</div>
</body>
</html>



Storing Complex Data Types in Sessions

 
<?php
  session_start();
  
  class myclass {
    protected $myvalue;
    
    public function setmyvalue ($newvalue){
      $this->myvalue = $newvalue;
    }
    
    public function getmyvalue (){
      return $this->myvalue;
    }
  }
  
  $_SESSION["myclass_value"] = new myclass ();
  
  function outputsessions (){
    $_SESSION["myclass_value"]->setmyvalue ("Hello World");
    echo $_SESSION["myclass_value"]->getmyvalue ();
  }
  outputsessions();
?>



Storing Complex Data Types to session

 
<?
    $myarr["0"] = "Sunday";
    $myarr["1"] = "Monday";
    $myarr["2"] = "Tuesday";
    $myarr["3"] = "Wednesday";
    $myarr["4"] = "Thursday";
    $myarr["5"] = "Friday";
    $myarr["6"] = "Saturday";
    $_SESSION["myarr"] = $myarr;
?>



Storing Simple Data Types in Sessions

 
<?php
  session_start();
  
  (int) $_SESSION["integer_value"] = "115";
  (string) $_SESSION["string_value"] = "Hello World";
  (float) $_SESSION["float_value"] = "1.07";
  
  function outputsessions (){
    echo $_SESSION["integer_value"] . "<br />"; 
    echo $_SESSION["string_value"] . "<br />"; 
    echo $_SESSION["float_value"] . "<br />"; 
  }
  outputsessions();
?>
Источник — «http://wbex.ru/index.php?title=PHP/Cookie_Session/Session_Variables&oldid=115»