PHP If...Else Statements

Conditional statements are used to perform different actions based on different conditions. Conditional StatementsVery often when you write code, you want to perform different actions for different decisions. You can use conditional statements in your code to do this. In PHP we have the following conditional statements: if statement - use this statement to execute some code only if a specified condition is true if...else statement - use this statement to execute some code if a condition is true and another code if the condition is false if...elseif....else statement - use this statement to select one of several blocks of code to be executed switch statement - use this statement to select one of many blocks of code to be executed The if StatementUse the if statement to execute some...

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PHP Operators

This section lists the different operators used in PHP. Operator Description Example Result + Addition x=2 x+2 4 - Subtraction x=2 5-x 3 * Multiplication x=4 x*5 20 / Division 15/5 5/2 3 2.5 % Modulus (division remainder) 5%2 10%8 10%2 1 2 0 ++ Increment x=5 x++ x=6 -- Decrement x=5 x-- x=4 Assignment Operators Operator Example Is The Same As = x=y x=y += x+=y x=x+y -= x-=y x=x-y *= x*=y x=x*y /= x/=y x=x/y .= x.=y x=x.y %= x%=y x=x%y Comparison Operators Operator Description Example == is equal to 5==8 returns false != is not equal 5!=8 returns true <> is not equal 5<>8 returns true > is greater than 5>8 returns false < is less than 5<8 returns true >= is greater than or equal to 5>=8 returns false...

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PHP String Variables

String Variables in PHPString variables are used for values that contain characters. In this chapter we are going to look at the most common functions and operators used to manipulate strings in PHP. After we create a string we can manipulate it. A string can be used directly in a function or it can be stored in a variable. Below, the PHP script assigns the text "Hello World" to a string variable called $txt: <?php $txt="Hello World"; echo $txt; ?>  The output of the code above will be: Hello World Now, lets try to use some different functions and operators to manipulate the string. The Concatenation OperatorThere is only one string operator in PHP. The concatenation operator (.)  is used to put two string values together. To concatenate two string variables...

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PHP Variables

Variables in PHPVariables are used for storing values, like text strings, numbers or arrays. When a variable is declared, it can be used over and over again in your script. All variables in PHP start with a $ sign symbol. The correct way of declaring a variable in PHP: $var_name = value;  New PHP programmers often forget the $ sign at the beginning of the variable. In that case it will not work. Let's try creating a variable containing a string, and a variable containing a number: <?php $txt="Hello World!"; $x=16; ?> PHP is a Loosely Typed LanguageIn PHP, a variable does not need to be declared before adding a value to it. In the example above, you see that you do not have to tell PHP which data type the variable is. PHP automatically converts the variable to...

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