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If Then Else for PHP
One of the most important syntax’s in programming is the If-Then-Else statement, it’s pretty much what the transistor does in hardware in the computer processor, it has a If then else system as well.
In PHP There are a few ways to write a If Then Else syntax:
Lets set a default value for the examples first:
|
1 |
$a = 10; |
If-Then-Else Syntax 1:
|
1 2 3 4 5 |
If ($a < 10) {
echo 'A is lesser than 10';
} else {
echo 'A is greater than 10';
} |
If-Then-Else Syntax 2:
|
1 2 3 4 5 |
If ($a < 10):
echo 'A is lesser than 10';
else:
echo 'A is greater than 10';
end if; |
If-Then-Else Syntax 3 (Shorthand):
|
1 |
echo ($a < 10 ? 'A is lesser than 10' : 'A is greater than 10'); |
In syntax’s 1 and 2 you can add a secondary condition called “else if” or “elseif”, this condition allows you to enter a secondary question to the if statement.
If-Then-Else Syntax 1 (Updated with ElseIf):
|
1 2 3 4 5 6 7 |
If ($a < 5) {
echo 'A is lesser than 5';
} elseif ($a < 10) {
echo 'A is lesser than 10, but equal or greater than 5';
} else {
echo 'A is greater than 10';
} |
If-Then-Else Syntax 2 (Updated with ElseIf):
|
1 2 3 4 5 6 7 |
If ($a < 5):
echo 'A is lesser than 5';
elseif ($a < 10):
echo 'A is lesser than 10, but equal or greater than 5';
else:
echo 'A is greater than 10';
end if; |
If-Then-Else Syntax 3 (Shorthand, Updated with ElseIf):
|
1 |
echo ($a < 5 ? 'A is lesser than 10' : ($a < 10 ? 'A is lesser than 10, but equal or greater than 5' : 'A is greater than 10')); |
Regular mode using either syntax 1 or 2 is fairly easy you just add in a secondary statement called elseif while with Shorthand you need to add in a whole other if else statement into the correct position, the Shorthand works like this:
(condition ? true : false)
So for a secondary statement if that condition registers as false as it does with an elseif statement, it really is a secondary if statement if the first one didn’t pass. This is the way to make a shorthand if elseif statement, you replace the false statement on the previous example such as this:
(condition1 ? true : (condition2 ? true : false))
I usually always used the Syntax type 1 but recently I’ve gotten fond of the Shorthand method, one good example is for generating selection menus from a MySQL/MariaDB database:
|
1 2 3 4 5 6 |
$data = @mysql_query('SELECT * FROM table ORDER BY name');
if (mysql_errno() == 0 && mysql_num_rows($data) > 0) {
while ($row = mysql_fetch_array($data, MYSQL_ASSOC)) {
echo '<option value="' . $row['id'] . '" ' . ($a == $row['id'] ? ' selected="selected"' : '') . '>' . $row['name'] . '</option>' . "\n";
}
} |
This example does a MySQL connection request and a loop through the data and if the $a value matches the $row['id'] for the current row it will output the following data:
|
1 |
<option value="x" selected="selected">Name</option> |
Otherwise you get this:
|
1 |
<option value="x">Name</option> |
These are the basics of If Then Else in PHP today.
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