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Conditional statement

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  • 1. CONDITIONAL STATEMENT INPHP
    WWW.USTUDY.IN
    Department of CE/IT
  • 2. Conditional Statement
    Conditional statements are the set of commands used to perform different actions based on different conditions.
    In PHP we have the following conditional statements:
    If
    If else
    Else if
    switch
    WWW.USTUDY.IN
  • 3. If statement
    If structure is used for conditional execution of code segment
    Syntax:
    if (expr)
    {
    Statements
    }
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  • 4. Example
    <?php
    if ($c > $d)
    {
    echo "c is bigger than d";
    }
    ?>
    In the above example, only if the condition "$c>$d" is true, the message "c is bigger than d" is displayed
    WWW.USTUDY.IN
  • 5. Else statement
    The conditional statement "else" is used as extension of "if" statement. If the condition fails then it executes another statements under the "else" condition.
    Syntax:
    if (expr)
    {
    Statements
    }//true
    else
    {
    Statements
    }//false
    Based on the result of expressions, the statements are executed.
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  • 6. Example
    <?php
    $c = 10;
    $d = 20;
    if ($c > $d)
    {
    echo "C is bigger than d";
    }
    Else
    {
    echo "D is bigger than c";
    }
    ?>
    WWW.USTUDY.IN
  • 7. Result
    Result: D is bigger than C
    In the above example in the if the condition "$c>$d" is true then the message "C is bigger than D" is displayed, else the message "D is bigger than C" is displayed.
    WWW.USTUDY.IN
  • 8. Else if statement
    else if statement is used as extension of "If" structure if the condition fails then it executes another "If" condition to execute the code segment under the "else if" statement
    WWW.USTUDY.IN
  • 9. Syntax
    if (expr 1)
    {
    Statements
    }//true
    elseif (expr2)//false
    {
    Statements
    }//true
    Else
    {
    Statements
    }//false
    Based on the failure "expr1" condition, "expr2" is checked and then the statements are executed.
    WWW.USTUDY.IN
  • 10. Example
    <?php
    $c = 10;
    $d = 10;
    if ($c > $d)
    {
    echo "c is bigger than d";
    }
    elseif ($c==$d)
    {
    echo "c is equal to d";
    }
    else
    {
    echo "d is smaller than c"; } ?>
    WWW.USTUDY.IN
  • 11. Result
    c is equal to d
    In the above example the if the condition "$c>$d" is true then the message "c is bigger than d" is displayed, else the condition in the else if that is "$c==$d" is evaluated if it is true the message "c is equal to d" is displayed otherwise "d is smaller than c" is displayed
    WWW.USTUDY.IN
  • 12. Switch statement
    The Switch case statement is used to compare a variable or expression to different values based on which a set of code is executed.
    WWW.USTUDY.IN
  • 13. Syntax
    Switch (Variable or expression)
    {
    Case (value 0):
    {
    Statements
    }
    Case (value 1):
    {
    Statements
    }
    …………
    Case (value n):
    {statements
    }
    default:
    {
    Statements
    }
    }
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  • 14. Example
    <?php
    $c=3;
    switch ($c)
    {
    case 0:
    echo "value of $c = 0 <br>";
    break;
    case 1:
    echo "value of $c = 1 <br>";
    break;
    case 2:
    echo "value of $c = 2 <br>";
    break;
    default:
    echo "value of $c = Default value <br>";
    break;
    } ?>
    WWW.USTUDY.IN
  • 15. Result
    value of 3 = Default value
    In the above example based on the value of $c the messages are displayed of that particular case which matches. The default case accepts anything not matched by other cases, so the value "3" displays the default message.
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  • 16. The End
    THANK U
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