1. Membuat Program Parkir Dengan Php

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The HTML <canvas> element is used to draw graphics on a web page.

The graphic above is created with <canvas>.

It shows four elements: a red rectangle, a gradient rectangle, a multicolor rectangle, and a multicolor text.

What is HTML Canvas?

The HTML <canvas> element is used to draw graphics, on the fly, via scripting (usually JavaScript).

The <canvas> element is only a container for graphics. You must use a script to actually draw the graphics.

Canvas has several methods for drawing paths, boxes, circles, text, and adding images.

Browser Support

The numbers in the table specify the first browser version that fully supports the <canvas> element.

HTML Canvas Can Draw Text

Canvas can draw colorful text, with or without animation.

HTML Canvas Can Draw Graphics

Canvas has great features for graphical data presentation with an imagery of graphs and charts.

HTML Canvas Can be Animated

Canvas objects can move. Everything is possible: from simple bouncing balls to complex animations.

HTML Canvas Can be Interactive

Canvas can respond to JavaScript events.

Canvas can respond to any user action (key clicks, mouse clicks, button clicks, finger movement).

HTML Canvas Can be Used in Games

Canvas' methods for animations, offer a lot of possibilities for HTML gaming applications.

Canvas Example

In HTML, a <canvas> element looks like this:

The <canvas> element must have an id attribute so it can be referred to by JavaScript.

The width and height attribute is necessary to define the size of the canvas.

Tip: You can have multiple <canvas> elements on one HTML page.

By default, the <canvas> element has no border and no content.

To add a border, use a style attribute:

Example

The next chapters show how to draw on the canvas.

I want to retrieve data from MySql table. I am using Xampp, phpMyAdmin etc.. I followed this tutorial step by step: https://www.youtube.com/watch?v=IHdd02IK2Jg

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But I get this error:

Notice: Undefined variable: records in C:XAMPPhtdocsdisplay_prsc.php on line 29

And a warning:

Warning: mysql_fetch_assoc() expects parameter 1 to be resource, null given in C:XAMPPhtdocsdisplay_prsc.php on line 29

It just displays the column names when i run it.

5 Answers

Note the space in your first php tag. You have <? php , it should be <?php

And since it seems you are starting to learn, avoid learning things deprecated. Don't use MySQL, use PDO or Mysqli.

You have a few errors in your code:

1. Wrong php opening tag

You have to remove the space in your php opening tag, e.g.

2. Weird html

Almost your entire html is wrong! I would recommend you to read a book or watch a basic html tutorial

So your entire code should look something like this:

Side Notes:

1. What can be improved?

• I would do some basic error checking e.g. if the connection failed and so on
• Use mysqli_* with prepared statements, or PDO with prepared statements, they are much safer! (We live in 2015)
• (Also if the guy in your tutorial uses mysql_*, change the tutorial!)

So that you don't only have your old code working, here your improved code:

2. Coding side notes

Membuat Program Parkir Dengan Php

Add error reporting to the top of your file(s) which will help find errors.

Error reporting should only be done in staging, and never production.

I recommend you using Prepared statements for MySQL instead of clean MySQL, it's not secure at all, and will give you problems later on.

A lille guide here.
http://www.w3schools.com/pHp/php_mysql_prepared_statements.asp

There are multiple errors in your code. But for the error, it is due to mysql_query() returns FALSE at line:

Then, the line while ($new=mysql_fetch_assoc($records)){ cannot get the value of $records, thus produce the errors.

Other errors are:

HTML

• missing DOCTYPE
• missing meta charset
• a missing </tr>
• a misplaced </head>
• be modern, use CSS to style your HTML instead of using HTML tag attributes

PHP

• didn't check the return value of functions before using them
• use of deprecated mysql_* functions; use PDO / MySQLi instead
• extra space at <? php

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