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PHP Selection & Looping Statements. Control Structures. Programming Languages commonly include a number of “control structures”, that allow users to execute based on evaluation. Blocks of statements are enclosed in curly brackets ({}). PHP includes the following control structures: IF-ELSE

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PHP Selection & Looping Statements

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PHP Selection & Looping Statements


Control Structures

Programming Languages commonly include a number of “control structures”, that allow users to execute based on evaluation. Blocks of statements are enclosed in curly brackets ({}). PHP includes the following control structures:

  • IF-ELSE

  • WHILE

  • FOR

  • SWITCH


Conditional Operators


Conditional Operators


Control Structure #1IF-ELSE

*NOTE: the else is optional


if Statements

if ($number > 10)

echo “That is a big number”;

if ($number > 10)

{

echo “<BR> The number is greater than 10.”;

echo “<BR> So, it must be big.”;

}

if ($number > 10)

echo “<BR> That’s a big number.”;

else

echo “<BR> That’s a small number.”;


if Statements

if ($number > 10)

{

echo “<BR> The number is greater than 10.”;

echo “<BR> So, it must be big.”;

}

else

{

echo “<BR> The number is less or equal to 10.”;

echo “<BR> So, it must be small.”;

}


if Statements

if ($number > 10)

if ($number > 100)

echo “<BR>That is a very big number.”;

else

{

echo “<BR> The number is greater than 10.”;

echo “<BR> So, it must be big.”;

}

else

echo “<BR>That is a small number.”;


if Statements

if ($number > 100)

echo “<BR>That’s a very big number.”;

elseif ($number > 10)

echo “<BR>That is a big number.”;

elseif ($number > 1)

echo “<BR> That is a small number.”;

else

echo “<BR> That is a very small number.”;


Control Structure #2SWITCH


switch Statement

switch ($number)

{

case 1:

echo “small”;

break;

case 2:

echo “medium”;

break;

case 3:

echo “large”;

break;

default:

echo “That is not a valid code.”;

}


Control Structure #3FOR


for statement

$sum = 0;

for ($n=1; $n<=3; $n++)

$sum += $n;

echo “<BR> The sum of the integers from 1 to $number is $sum.”;


Control Structure #3WHILE

NOTE: $timeleft- - is equivalent to $timeleft = $timeleft -1


while statement

$n = 0;

$sum = 0;

while ($n <=3)

{ $sum = $sum + $n;

$n++;

}

echo “The sum is $sum”;


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