PHP If Condition

Posted by tutor | Posted in PHP Tutorial | Posted on 09-08-2010-05-2008

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The If Statement

This statement executes a piece of code only when a condition is true.

Syntax

    if (condition) code to be executed if condition is true;
    For eg:

    <html>
    <body>
    <?php
    $d=date(”D”);
    if ($d==”Fri”) echo “Today is Friday!”;
    ?>
    </body>
    </html>

The if…else Statement

This is a two way condition evaluation, in which there are yes and no both lead to different code block.

We just add one else condition in the above if statement.

Syntax

    if (condition)
    code to be executed if condition is true;
    else
    code to be executed if condition is false;
    For eg:

    <html>
    <body>
    <?php
    $d=date(”D”);          if ($d==”Fri”)
    echo “Today is Friday!”;         else
    echo “Today is not Friday!”;
    ?>
    </body>
    </html>

If more than one line should be executed, then the lines should be enclosed within curly braces:

    <html>
    <body>
    <?php
    $d=date(”D”);
    if ($d==”Fri”)
    {
    echo “Hello!<br />”;
    echo “Today is Friday!”;
    }
    ?>
    </body>
    </html>

The if…elseif….else Statement

This construct is used when there are more conditions than just true or false.

When PHP evaluates If…elseif…else statement it first sees if the If statement is true. If that test comes out to be false it then checks the first elseif statement.

If then also the result comes out to be false it will check the next elseif statement, if there exists any more otherwise, it will evaluate the else segment, if one exists.

Syntax

    if (condition)
    code to be executed if condition is true;
    elseif (condition)
    code to be executed if condition is true;
    else
    code to be executed if condition is false;
    For eg:

    <html>
    <body>
    <?php
    $d=date(”D”);        if ($d==”Fri”)
    echo “Today is Friday!”;        elseif ($d==”Sun”)
    echo “Today is Sunday!”;        else
    echo “Today is neither Friday nor Sunday!”;
    ?>
    </body>
    </html>

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Conditional Statements

Posted by tutor | Posted in PHP Tutorial | Posted on 04-08-2010-05-2008

0

Conditional statements are used to evaluate some conditions and perform different actions based on the outcome.

You can use conditional statements in your code to do this.

PHP provides the following conditional statements:

  • If statement – execute the piece of code only if a specified condition is true.if (condition) code to be executed if condition is true;
  • If…else statement – this statement executes a two way condition, where the true part does something else and the false part executes something else.if (condition)
    code to be executed if condition is true;
    else
    code to be executed if condition is false;
  • If…elseif….else statement – if there are multi-way condition, where there are several blocks of code to be executed based on different conditions.if (condition)
    code to be executed if condition is true;
    elseif (condition)
    code to be executed if condition is true;
    else
    code to be executed if condition is false;
  • Switch statement – this statement is used to select one of many blocks of code to be executedswitch (n)
    {
    case label1:
    code to be executed if n=label1;
    break;
    case label2:
    code to be executed if n=label2;
    break;
    default:
    code to be executed if n is different from both label1 and label2;
    }

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