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Just like an "if statement", an "elseif statement" also contains a conditional statement, but it must be preceded by an "if statement".

You cannot have an "elseif statement" without first having an "if statement".

When PHP evaluates your "If...elseif...else statement" it will first see if the "If statement" is true.
If that tests comes out false it will then check the first "elseif statement".
If that is still false it will either check the next "elseif statement", if one exists.
If there are no more "elseif statements", it will evaluate the "else statement", if one exists

Example for Elseif.

PHP Code:

$employee = "Sam";

if($employee == "Ms. Smith"){
echo "Hello Ma'am";
} else {
echo "Morning";
}

Now, if we wanted to also check to see if the big boss Sam was the employee we need to insert an elseif clause.

PHP Code:

$employee = "Sam";

if($employee == "Ms. Smith"){
      echo "Hello Ma'am";
} elseif ($employee == "Sam"){
      echo "Good Morning Sir!";
} else {
      echo "Morning";
}

Display:

Good Morning Sir!

PHP first checked to see if $employee was equal to "Ms. Smith", which evaluated to false.

Next, PHP checked the first "elseif statement. $employee did in fact equal "Sam" so the phrase "Good Morning Sir!" was printed out.

If we wanted to check for more employee names we could insert more "elseif statements.

Remember that an "elseif statement" cannot be used unless it is preceded by an "if statement!

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

If statement နဲ႔ elseif statement ဟာ သေဘာတရား နဲ႔ လုပ္ေဆာင္ ပံုခ်င္း အတူတူ ပါဘဲ။ true နဲ႔ false ကို စစ္ေဆး တာပါဘဲ၊ ဒါေပမဲ့ elseif statement ရဲ ေရွ့မွာ if statement ရွိရ ပါမယ္။

If statement ကိုေရွ႔က အရင္ မေရးပဲ elseif statement ကိုသံုးလို႔ မရ ပါဘူး။

If...elseif...else statement ကို run တဲ့အခါ ထိပ္ဆံုးက If statement ဟာ true ဟုတ္မဟုတ္ အရင္ စစ္ေဆး ပါတယ္။
False ျဖစ္ေနရင္ ေနာက္ကကပ္ ပါလာတဲ့ elseif statement ကို true ဟုတ္မဟုတ္ အရင္ စစ္ေဆး ပါတယ္။
တကယ္လို႔ false ျဖစ္ေနေသးရင္ ေနာက္ထပ္ elseif statement ကို true ဟုတ္မဟုတ္ စစ္ေဆး ျပန္ ပါတယ္။ ("elseif statement" ဟာ တခု မက ရွိႏိုင္ ပါတယ္)
ေနာက္ဆံုး elseif statements ေတြကုန္ သြားတဲံ အခါမွာ ေနာက္ဆံုး က်န္တဲ့ else statement ကို စစ္ေဆး ပါတယ္။

Elseif ဥပမာ

PHP Code:

$employee = "Sam";

if($employee == "Ms. Smith"){
echo "Hello Ma'am";
} else {
echo "Morning";
}

အေပၚမွာ ျပထားတဲ့ ရိုးရိုး If-Else ဥပမာ ကို ေအာက္မွာ ျပထား တဲ့အတိုင္း ၾကားထဲမွာ elseif တလိုင္း ထပ္ထဲ့ ထားတဲ့ ပံုစံ ကို သေဘာေပါက္ ေအာင္ ေလ့လာပါ။ elseif ဟာ တလိုင္း မကဘဲ လိုင္းေတြ အမ်ားႀကီး ရွိႏိုင္ ပါတယ္။

PHP Code:

$employee = "Sam";

if($employee == "Ms. Smith"){
      echo "Hello Ma'am";
} elseif ($employee == "Sam"){
      echo "Good Morning Sir!";
} else {
      echo "Morning";
}

Display:

Good Morning Sir!

PHP ဟာ ပထမ ဆံုး $employee ဟာ Ms. Smith ဟုတ္မဟုတ္ စစ္ေဆး ပါတယ္။ false ျဖစ္ေန ပါတယ္။

ထို႔ေနာက္ PHP ဟာ ေနာက္က ကပ္ ပါလာတဲ့ elseif statement. နဲ႔ $employee ဟာ Sam ဟုတ္မဟုတ္ စစ္ေဆး ျပန္ပါတယ္။ True ျဖစ္တဲ့ အတြက္ "Good Morning Sir!" ကို echo လုပ္ ပါတယ္။

ေနာက္ထပ္ employee စစ္ေဆး ခ်င္ေသးရင္ elseif statements ေတြ ထပ္ထဲ့ ႏိုင္ပါတယ္။

တစ္ခုေတာ့ မွတ္ထားပါ ပထမဆံုး elseif statement ရဲ့ေရွ့မွာ if statement တခု ရွိရ ပါမယ္။

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