What is user defined function in php?

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What is the use of $_server and $_env?

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I have two radio button, i click one radio button display one dropdown box, one text field. and then click another radio button display one text field.so any one give me good idea plz.....i used <div id="" style=display:none> but not work..

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What is restful api?

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What is substr() in php? And how it is used?

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Whhat is a Functions

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Why post method is used in php?

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How does php server work?

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What is mysql_fetch_object?

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i start a new session with : session_start(); then i set some session variable like this : $_SESSION['name']=$_POST['name'];\ and some another variables. at bottom of page i set header to diffrent page : header('location: index.php'); exit(); now in new page (index.php i can't access to my session variables, like $_SESSION['name']) what's wrong ? thanks. here is my files : a.php ======================================== session_start(); require ('config.inc.php'); if(isset($_POST)) foreach($_POST as $v=>$k) { $items[$v]=$k; } $sql="SELECT * FROM members WHERE username='{$items['user']}' AND pass=MD5('{$items['Password']}') "; $res=mysql_query($sql); $row=mysql_fetch_assoc($res); if($row['username']) { $_SESSION['type']=$row['type']; $_SESSION['name']=$row['name']; $_SESSION['family']=$row['family']; $_SESSION['username']=$row['username']; $_SESSION['date']=$row['date']; } header('location: admin.php'); exit(); ====================================== admin.php ===================================== <?php session_start(); if(!isset($_SESSION['admin'])) { header('location: index.php'); exit(); } require ('config.inc.php'); ?> . . . =================================

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What are traits?

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Why do we use javascript in php?

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