PHP is a server side scripting language<\/p>\n
PHP script is written within <?php\u00a0 \u2026.. ?><\/p>\n
When browser request a php document, the web server calls PHP processor, and the PHP processor interprets the script and sends the output of the script back to the web browser.<\/p>\n
<\/p>\n
The output of the PHP script is always an HTML. The client requesting the PHP script will never see the PHP code in the web browser.<\/p>\n
PHP scripts are saved using .php file extension<\/p>\n
<\/p>\n
PHP is a purely interpreted language, however recent developments of PHP performs some precompilation.<\/p>\n
<\/p>\n
PHP is case sensitive<\/p>\n
<\/p>\n
The syntax of PHP is very similar to JavaScript<\/p>\n
PHP statements are terminated with semicolon<\/p>\n
Braces are used for compound statements or body of the control statements and functions<\/p>\n
<\/p>\n
PHP uses dynamic typing<\/p>\n
Variables are not declared using type<\/p>\n
The type of the variable is set whenever the variable is assigned a value<\/p>\n
Variable in PHP begin with a dollar ($) character followed by variable name<\/p>\n
An unassigned variable has a value NULL and is known as unbound variable.<\/p>\n
<\/p>\n
If unassigned variables are used in an expression, then its value is coerced to 0 if the context is number and coerced to empty string if its context is a string<\/p>\n
To check whether a variable has a value, IsSet function is used. This function takes variable as an argument and returns true if the variable has a value and false if variable is unassigned.<\/p>\n
<\/p>\n
The type of the variable can be determined in two ways:<\/p>\n
Takes variable as parameter and returns string containing type of the variable<\/p>\n
is_int(), is_integer(), is_long(), id_double(), is_float(), is_real(), is_bool() and is_string()<\/p>\n
<\/p>\n
<\/p>\n
PHP allows comments in three different ways:<\/p>\n
Single line comments are specified using # or \/\/<\/p>\n
Multiline comments uses \/*\u00a0\u00a0\u00a0\u00a0 \u2026\u2026\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *\/<\/p>\n","protected":false},"excerpt":{"rendered":"
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