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Say you are studying for an exam.

If you study hard you will pass the exam
Else you will fail

How does this translate into something useful for PHP developers? Well consider this:

If--Else Example

Here is an "if--else" statement in PHP.

PHP Code:

$number = 4;

if( $number == 4 ) {
echo "The if statement evaluated to true";
} else {
echo "The if statement evaluated to false";}

Display:

The if statement evaluated to true

Let us step through the code, line by line.

First a PHP variable called "$number" was set to "4"
Next we compare to see if "$number" was equal to "4". To do such a comparison we use "==".
As "$number" is indeed Equal To "4", condition evaluated is true.
Therefore, "The if statement evaluated to true" is echoed.

Execute Else Code with False

On the other hand, if the if statement was false, then the code contained in the else segment would have been executed.

Here is what would happen if we changed to "$number" to anything but "4".

PHP Code:

$number = 421;

if ( $number == 4 ) {
echo "The if statement evaluated to true";
} else {
echo "The if statement evaluated to false";
}

Display:

The if statement evaluated to false

The variable was set to "421", which is not equal to "4" and the if statement was false.

The code segment contained within the else was used in this case.

Note
For more detail please see Php Manual at http://www.php.net

သင္သည္ စာေမးပြဲ ေျဖရန္ စာက်က္ ေနသည္ ဆိုပါစို႔။ ေအာက္ပါ အတိုင္း အေျဖ ထြက္မည္။

ငါစာေၾက ရင္ စာေမးပြဲ ေအာင္မည္။ မဟုတ္ရင္ စာေမးပြဲ က်မည္။

If you study hard you will pass the exam
Else you will fail

အထက္ပါ သေဘာ တရားကို PHP programming မွာဘယ္လို အသံုးခ် ထားတယ္ ဆိုတာ ၾကည့္ၾက ရေအာင္။

If--Else ဥပမာ

ေအာက္တြင္ ေဖၚျပ ထားေသာ "if--else" နမူနာ ကို ေလ့လာ ၾကည့္ပါ။

PHP Code:

$number = 4;

if( $number == 4 ) {
echo "The if statement evaluated to true";
} else {
echo "The if statement evaluated to false";}

Display:

The if statement evaluated to true

Code ေတြကို တလိုင္းခ်င္း စစ္ၾကည့္ ၾကရေအာင္။

ပထမ line မွာ $number = 4 လို႔ သတ္မွတ္ လိုက္တယ္။
ေနာက္ line မွာ if statement ကိုသံုးၿပီး $number ဟာ 4 ဟုတ္မဟုတ္ စစ္ၾကည့္တယ္။ ဒီေနရာမွာ comparison အတြက္ == လို႔ equal sign ႏွစ္ခါ သံုးထား တာကို မွတ္သားပါ။
$number ဟာ 4 နဲ႔ ညီတဲ့ အတြက္ condition ဟာ true ျဖစ္ပါတယ္။
ထို႔ေၾကာင့္ "The if statement evaluated to true" ဆိုတဲ့ စာေၾကာင္းကို echo လုပ္ပါတယ္။

False ျဖစ္တဲ့ If-Else ဥပမာ

ေအာက္ေဖၚျပပါ ဥပမာ မွာ၊ $number = 421 လို႔ အရင္ သတ္မွတ္ ေပးလိုက္ ပါတယ္။

$number ဟာ 4 နဲ႔ မညီ ေတာ့ရင္ ဘယ္လို ျဖစ္သြား တယ္ဆိုတာ ေလ့လာ ၾကည့္ပါ။

PHP Code:

$number = 421;

if ( $number == 4 ) {
echo "The if statement evaluated to true";
} else {
echo "The if statement evaluated to false";
}

Display:

The if statement evaluated to false

$number ဟာ 4 နဲ႔ မညီ တဲ့အတြက္ condition ဟာ false ျဖစ္ပါတယ္။

အဲဒီ အခါမွာ code ေနာက္တစ္ေၾကာင္း ျဖစ္တဲ့ "The if statement evaluated to false" ဆိုတဲ့ စာေၾကာင္းကို ေျပာင္းၿပီး echo လုပ္သြားတာ ေတြ႔ရ ပါတယ္။

Note
For more detail please see Php Manual at http://www.php.net