Control Structures in PHP

Tutorial Title: Control Structures in PHP
Course: PHP
Instructor: Muhammad Samim

1. If, elseif and else statements in PHP

• These are the conditions which are applied to control the flow of program

if(3<2) { echo "First condition";}

elseif (3>10) {echo "Second condition;}

else {echo "all conditions are false";}

//"all conditions are false" will be displayed because because above both conditions are false

2. Comparison operators in PHP

• Equal == //e.g 3 == "3" This condition will be true, datatypes are change but values are same
• Identical ===   //To identify if both values are same and of same datatype e.g 3 === "3" This condition will be false because values are same but datatypes are change
• Less than <
• Greater than >
• Less than or Equal to <=
• Greater than or Equal to >=
• Less than or Greater than <>
• Not Equal  !=
• Not Identical !==

3. Logical Operators in PHP

• And &&
• Or ||
• Not !
• e.g if (6 === "6" && 6 < 10){echo "Condition is true";} //It will not be displayed because one condition is false in && case both conditions must be true
• e.g if (6 === "6" || 6 < 10){echo "Condition is true";} //It will be displayed because in both conditions one is true

4. Switch Statement in PHP

• It works as if statement does but here we can compare multiple values against one condition

$variableName = 30;

switch($variableName){

case 24:

echo "This is 24";

break;

case 30:

echo "This is 30";

break;

case 50:

echo "This is 50";

break;

default:

echo "All cases are false";

break;

}

//"This is 30" will be displayed because 30 is equal to the value of variable.

5. While Loop in PHP

• Its used to to repeat anything in program

$variableName = 0;

while($variableName <= 10){

echo $variableName . "<br>";

$variableName ++;

}

//0 to 10 numbers will be displayed

$variableName = 0;

while($variableName <= 10){

echo "This is nightLife<br>";

$variableName ++;

}

//11 times "This is nightLife" will be displayed


6. For Loop in PHP

• Its same like While Loop but in For Loop we can create variable, set the condition and increment in variable in one line inside For Loop.

for($variableName = 0; $variableName <=10; $variableName ++){
echo $variableName . "<br>";
}
//0 to 10 numbers will be displayed


7. Foreach Loop

• Foreach Loop is used for arrays to access each element of them

$arrayName = array(1232,4534,565,678,987);
foreach($arrayName as $variableName){
echo $variableName . "<br>";
}
//It will displayed all elements of array