comments in php in php, we use // to make a singleline comment or /* and */ to make a large comment...

Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will not be translated by the PHP engine. You can use it to write documentation of your PHP script describing what the code should do. A comment can span only for one line or span multiple line. COMMENTS AND VARIABELS IN PHP

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Page 1: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Comments in PHPIn PHP, we use // to make a singlelinecomment or /* and */ to make a large commentblock.Comment is a part of your PHP code that will not be translated by the PHP engine. Youcan use it to write documentation of your PHP script describing what the code should do.A comment can span only for one line or span multiple line.

COMMENTS AND VARIABELS IN PHP

Page 2: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

PHP support three kinds of comment tags :1. //This is a one line comment2. #This is a Unix shellstylecomment. It's also a one line comment3. /* ..... */

Page 3: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Use this multi line comment if you need to.example :<html><body><?php//This is a comment/*This isa commentblock*/?></body></html>

Page 4: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

example :<?phpecho "First line "; // You won't see me in the output// I'm a one liner comment/*Same thing, you won'tsee this in the output file*/echo "The above comment spans two lines ";# Hi i'm a Unix shell-style comment# Too bad you can't see meecho "View the source of this file, you'll see no comments here ";?>

Page 5: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

PHP OperatorsOperators are used to operate on values.PHP OperatorsThis section lists the different operators used in PHP.

Page 6: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Page 7: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Page 8: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Variable TypesPHP supports eight primitive types.Four scalar types:● boolean : expresses truth value, TRUE or FALSE. Any non zero values and nonempty string are also counted as TRUE.● integer : round numbers (5,0, 123, 555, ...)● float : floatingpointnumber or 'double' (0.9283838, 23.0, ...)● string : "Hello World", 'PHP and MySQL, etc

Page 9: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

Two compound types:● array● objectAnd finally two special types:● resource ( one example is the return value of mysql_connect() function)● NULLIn PHP an array can have numeric key, associative key or both. The value of an array canbe of any type. To create an array use the array() language construct like this.

Page 10: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

example : array.php<?php$numbers = array(1, 2, 3, 4, 5, 6);$age = array("mom" => 45, "pop" => 50, "bro" => 25);$mixed = array("hello" => "World", 2 => "It's two";echo "numbers[4] = {$numbers[4]} ";echo "My mom's age is {$age['mom']} ";echo "mixed['hello'] = {$mixed['hello']} ";echo "mixed[2] = {$mixed[2'}";?>

Page 11: Comments in PHP In PHP, we use // to make a singleline comment or /* and */ to make a large comment block. Comment is a part of your PHP code that will

When working with arrays there is one function I often used. The print_r() function.Given an array this function will print the values in a format that shows keys andelementsprintr.php<?php$myarray = array(1, 2, 3, 4, 5);$myarray[5] = array("Hi", "Hello", "Konnichiwa", "Apa Kabar");echo '<pre>';print_r($myarray);echo '</pre>';?>

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