Constants are simple pieces of data which cannot be changed during PHP script execution. It is useful for storing data which should remain unchanged, like a maximum or minimum value of a variable, etc.
Before first use, constant should be defined: ...
define("MY_MAX_VALUE", 505);
... After this, you can use it:
...
if ($my_variable < MY_MAX_VALUE)
{
... (some code here)
}
...
First of all, PHP is server side, Javascript is client side. You cannot detect mouse gestures or any clicks with PHP the same way you cannot read a file or modify it or process a form (unless you use AJAX of course). Also, although I love PHP, and it has useful extensions such as the GD library, PHP is not a very good language. Overall we use javascript and PHP because they are used for two completely different things.
We can use php tags in different ways. <?php //php code to be written here ?> OR <? //php code ?> This tag will not work when we using editors such as macromedia dreamweaver. OR < script language="php"> //php code </script>
To concatenate strings in PHP, you use the . (dot) character. For example: $str = "String1" . "String2";
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
this is not really a question... But I think you are asking why php functions inside a HTML button do not work. Well probably because php is rendered serverside and is passed to a user-browser afterwards.... it is possible to use php inside onclick... but only to display specific content (javascript function for instance)... it is not possible to let a user decide to run a specific php function by clicking a button.
PHP case sensitivity refers to that in coding it matters if the code is in capital letters. Case sensitivity specifically in PHP refers to variables, constants, array keys, class properties, and class constants. Some items in PHP that are not case sensitive are functions, class constructors, class methods, and keywords and constructs.
It is used to tell the sever to use the PHP parser. To begin php you must use <?php, and to end it, it is ?>.
You can't use PHP in an HTML document, but you can use HTML in PHP script.
Flags in PHP are just a kind of constants. They map to a number and are used as optional function parameters. For instance in a file_put_contents() function there is a flag called FILE_APPEND, which appends the data to the file instead of overwriting it.
PHP files extension is .php
Firstly, this is wrong question. The right one would be WHEN should you use PHP, not JSP? or, WHEN should you use PHP and WHEN JSP?
PHP 5 has a XML parser called SimpleXML that you could use.
You can use phpMailer() Or, you can use mail() PHP function to send emails via PHP script.
PHP certification is received after doing some sort of PHP course, there are many out there to do. You can use them in your CV to help you get a job in PHP.
Facebook uses PHP 5.
There are no PHP tags. Unlike HTML, PHP is not Markup language. They use scripts. An example would be <?php echo "Hello, World!"; ?>
That's PHP Engine.. Allow you to develop PHP Scripts.. you can use it to develop PHP Scripts and test it on your local machine before you send it to server.. (your website)