Difference between revisions of "Learning PHP (2)"

Revision as of 16:41, 3 September 2015

This article contains examples of PHP.

PHP provides the time function, which returns the time (from the server clock).

The time can be formatted and used in a variety of ways.

Code snippet:

<p><?php echo time(); ?></p>

Observe how the above code snippet mixes HTML with PHP code islands.

Use your browser's View Source or Inspect Element to confirm that the web page's source code contains only HTML, no PHP.

See [time] for documentation, Timestamp for general information.

PHP provides the date() function, which returns date and time.

The date and time can be formatted and used in a variety of ways.

Code snippet:

<p><?php echo date("Y/m/d"); ?></p>
<p><?php echo date("l"); ?></p>

Observe how the above code snippet mixes HTML with PHP code islands.

Use your browser's View Source or Inspect Element to confirm that the web page's source code contains only HTML, no PHP.

See PHP date for more information.

Warning: this topic is critical to web security.

Always use htmlspecialchars (or some equivalent technology) when processing user input. Always, always, always.

PHP provides a function named htmlspecialchars which handles special HTML characters.

Handles, in this case, includes replacing dangerous HTML with safe HTML.

@@ Line 46: / Line 46: @@
 Warning: this topic is critical to [[web security]].
-'''Always use htmlspecialcharacters''' (or some equivalent technology) '''when processing [[user input]]'''. Always, always, always.
+'''Always use htmlspecialchars''' (or some equivalent technology) '''when processing [[user input]]'''. Always, always, always.
 PHP provides a function named [[PHP htmlspecialchars function|htmlspecialchars]] which handles [[special HTML characters]].