Syntax
PHP’s syntax is derived from many languages—predominantly the C language, but
Perl has also had a lot of influence on its syntax. With the latest object-oriented additions,
more Java-like syntax is creeping in as well.
PHP’s syntax remains simple and easy to understand.
There are four types of tags to start php line code.
PHP Standerd Tags:
1. Standard Tgs
2. Short Tags
3. Asp Tags
4. Script Tags
Short tags only avalible when they avalibe from short_open_tags in php.ini
Asp tags only avalible when they avalibe from Asp_tags in php.ini
Note: Short tags, script tags and ASP tags are all considered deprecated and their use is
strongly discouraged.
Anatomy of PHP script:
1. Every PHP script is made up of statements, Each of these instruction is to be terminated just like in c,java,perl -- with semicolen,
echo "one";
echo "two";
?>
2. This requirement is not strict in before close tag statement statement does not require a semicolen
ex:
echo "one"
?>
3. The closing tag of a PHP block at the end of a file is optional (Semicolen must).
echo "one";
Do not mis interpret
echo 'Ending tag excluded';
with
php echo 'Ending tag excluded';
<p>But html is still visiblep>
The second one would give error. Exclude ?> if you no more html to write after the code 4. Comments:
Php supports Shell type comments
// Single line comment
# single line comment
/* Multiline
comment
* /
/**
*
* This is another style
*/
4. PHP whitespace insensitive . You could not write
