In PHP, all variables must the preceded by the dollar sign.
Variable name must not contain any space as well.
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As it is, PHP does not have a preprocessor; it is a preprocessor that processes form variables and other environmental variables and prints HTML or general text.
Variables in PHP do not need to be declared like some languages (e.g. JavaScript). This is all that needs to be done to assign a variable: $variable = "Value";
<?php // start session session_start(); // Assign value to session $user = $_SESSION['variable_name']; // variable_name = value to store in session // To reset session variable use below method unset($user); // If you want to destroy all session variables use below method session_destroy(); // destroys all session variables ?>
All you have to do to maintain a session is start it before you call any variables. Once you've started the session, you can store variables for use in later scripts. Beware though, once the user closes the browser, the sessions' over. I'd use the following SCRIPT 1: <?php // Start session session_start(); // Set some variables (this simulates form input) $_SESSION['answers']['Q1'] = 18; $_SESSION['answers']['Q2'] = 36; $_SESSION['answers']['Q4'] = "Fred"; ?> ============================= Hope that helps...
By using a third temporary variable. $tmp = $a; $a = $b; $b = $tmp;
As it is, PHP does not have a preprocessor; it is a preprocessor that processes form variables and other environmental variables and prints HTML or general text.
Variables in PHP do not need to be declared like some languages (e.g. JavaScript). This is all that needs to be done to assign a variable: $variable = "Value";
<?php // start session session_start(); // Assign value to session $user = $_SESSION['variable_name']; // variable_name = value to store in session // To reset session variable use below method unset($user); // If you want to destroy all session variables use below method session_destroy(); // destroys all session variables ?>
All you have to do to maintain a session is start it before you call any variables. Once you've started the session, you can store variables for use in later scripts. Beware though, once the user closes the browser, the sessions' over. I'd use the following SCRIPT 1: <?php // Start session session_start(); // Set some variables (this simulates form input) $_SESSION['answers']['Q1'] = 18; $_SESSION['answers']['Q2'] = 36; $_SESSION['answers']['Q4'] = "Fred"; ?> ============================= Hope that helps...
Variables in php begin with $ and are declared by the user. $str1 = "wiki"; would store "wiki" into the variable $str1
There are many things that can stop your variables from passing between your forms and your php scripts. One common reason is that your php configuration file is not configured to pass your form variables as globals, and instead passes them through the $_GET and $_POST superglobals. So, for example, if you form is as such: <form method="post"> <input name="whatever"> </form> Your php script would access the variable $whatever through the $_POST superglobal. $whatever = $_POST['whatever'];
PHP code blocks start with <?php and end with ?>.
By using a third temporary variable. $tmp = $a; $a = $b; $b = $tmp;
Delimiter is a special character or a symbol to seperate the string
PHP is a programming language. An "expression" is anything that can be evaluated (calculated) to get (among other things) a number. For example, numbers themselves; variables that represent numbers; calculations that result in a number (additions, subtractions, etc.), are all numeric expressions.
Problem with using global variables in php is that they lose the the assigned value in a different php file. They only keep the global variable value in the php file in which they are declared. Instead of globals try and use $_SESSION or $_COOKIE to keep value intact across different php files in a project
Use the "static" keyword to declare a static variable within a function like shown below. <?php function fun() { static $variable; static $another_variable = ''; } ?>