PHP
The PHP superglobal variables are:
$GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
PHP $_GET
$_GET contains an array of variables received via the HTTP GET method. There are two main ways to send variables via the HTTP GET method: Query strings in the URL HTML Forms
How do you get information from a form that is submitted using the "get" method?
$_GET[];
$_POST
$_POST contains an array of variables received via the HTTP POST method. There are two main ways to send variables via the HTTP Post method: HTML forms JavaScript HTTP requests
$_SERVER
$_SERVER is a PHP super global variable which holds information about headers, paths, and script locations.
Syntax of fopen()
$myfile = fopen("file.txt", "r") or die("Unable to. open file!"); fread($myfile, filesize("file.txt")); fclose($myfile);
get name from the input when form is submitted.
$name = $_POST['fname']; echo $name
usign prg_match() regExpresion
$str = "Visit W3Schools"; $pattern = "/w3schools/i"; echo preg_match($pattern, $str);
remove all session variables and dertoy it.
// remove all session variablessession_unset();// destroy the sessionsession_destroy();
what are the steps to follow to create a session in php?
1: start a session:session_start(); 2: set session variables: $_SESSION["favColor"] = "green"; 3: Access it in any page if you are accessing it in another page, start session
include footer.php into your code?
<?php include 'footer.php';?>
What is the correct way to include the file "time.inc" ?
<?php include"time.inc";?>
$GLOBALS
An array that contains all global variables. $x = 8; function m(){ echo $GLOBALS['x']' //the function can access the x even if it is in different place of the code. }
What does the isset function do?
Checks for null: It specifically checks if a variable is assigned a null value.
What does PHP stand for?
Hypertext Preprocessor
$__REQUEST
Is a PHP super global variable which contains submitted form data, and all cookie data. In other words, $_REQUEST is an array containing data from $_GET, $_POST, and $_COOKIE. eg :$_REQUEST['firstname']
what does filter_var() function do ?
It is the easiest and safest way to check whether an email address is well-formed
The PHP syntax is most similar to:
Perl and C
readfile() function
Reads a file and writes it to the output buffer. is useful if all you want to do is open up a file and read its contents.
What is the $_SERVER["PHP_SELF"] variable?
The $_SERVER["PHP_SELF"] is a super global variable that returns the filename of the currently executing script.
What is the htmlspecialchars() function?
The htmlspecialchars() function converts special characters into HTML entities. This means that it will replace HTML characters like < and > with < and >. This prevents attackers from exploiting the code by injecting HTML or Javascript code (Cross-site Scripting attacks) in forms
preg_match()
The preg_match() function will tell you whether a string contains matches of a pattern.
How do you keep the values in the input fields when the user hits the submit button?
add an inline php script to the HTML input element and echo the value onto it.
feof();
checks if the "end-of-file " (EOF) has been reached
PHP stripslashes() function
emove backslashes \ from the user input data
fopen()
gives more options than the readfile() function
How can you validate URL in php?
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) { $websiteErr = "Invalid URL"; }
what will include do if the script was werong?
it will only produce a warning and the script will continue.
Delete a Cookie
setcookie("user", "", time() - 3600);
how do you create cookies with PHP?
setcookie(name, value, expire, path, domain, secure, httponly); Only the name parameter is required. All
What do the include() or require() function allow you to do?
tatement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement.
require will produce a fatal error and stop the script true or false
true
Strip unnecessary characters php
use trim();
what are the ways you can output text with php?
you can use echo """; or print(""_);
