PHP Code and Its Usage

[sohanuzzaman54]

Constants are special, simpler variables. Their values ​​can only be defined once, and they apply globally to all parts of a script.

In writing, the rules are the same as variables. The only difference is the use of the define () function , instead of the $ symbol. However, in practice constant characters are often written in all capital letters, to provide more emphasis.

Comment
Sometimes PHP scripts contain a series of sentences that do not appear on the web page . This is called a comment, a line without instructions that is useful for providing special information to the reader of the code. Comments can serve as a reminder of the intent of the written code script.

PHP code can be organized into a function to execute list of northeast cell phone numbers the program. Execution can be done many times by simply applying a loop of one function, so that the programming duration is shorter.


Here are the most important codes that PHP developers should know .

IF – ELSE – ELSEIF
Serves to select a condition. IF selects code execution according to the specified conditions, ELSE if all conditions are not met, and ELSEIF selects execution other than the specified conditions.

SWITCH – CASE
Its function is almost similar to the previous code sequence. It is more suitable for avoiding excessive use of IF-ELSE-ELSEIF to be efficient. Or selecting one variable that has many possibilities.

FOR
Including looping code, FOR is used to order continuous execution until a certain number is reached.

FOREACH
Function to repeat the execution of several lines of code that have array value variables .

WHILE
Code to start execution when a certain condition is reached, and continue repeating it as long as the condition has not changed.

DOWHILE
Almost the same as WHILE, but starts with a single execution of the test when a certain condition is reached. Then repeats it as long as the condition has not changed.

EMPTY
Function to check whether a declared variable has a value or not.

ISSET
Used to validate the existence of a variable, regardless of its value.

UNSET
The following variables can have their values ​​removed with this UNSET code.

IS_( data type)
The IS_ code followed by the data type name, functions to check the value type of a variable. Is it an array (IS_ARRAY), integer (IS_INT), Boolean (IS_BOOL), or float (IS_FLOAT)?

To understand more about PHP, you can access their official website. Fortunately, every error, change, and improvement of PHP has been well documented so that PHP developers will be greatly helped by the various information.