Switch
Evaluates the initial expression only once, then compares it against the values.
$a = 2;
switch($a) {
case 1:
echo 'one';
break;
case 2:
echo 'two'; // two
break;
default:
}
Conditional
Conditional assigment operators are used to set a value depending on conditions.
/**
* Conditional assigment operators
*
* Ternary operator:
* is a shorthand for the if ... else statement.
*
* Null coalescing:
* is a shorthand for if does not exist or is NULL
*/
$a = 1;
echo $a == 1 ? 1 : 2; // 1
echo !empty($b) ? $b : 2; // 2
echo $b ?? 2; // 2
While
With do / while the contents of the loop will be executed at least once.
/**
* Even if the condition never evaluates to true ...
* the content of the do / while is executed at least once.
*/
$i = 0;
$k = 0;
do {
echo $i = $i + 1; // 1
} while ($i < 0);
while ($k < 0) {
echo $k = $k + 1; // nothing
}
Break
It takes an optional parameter, which allows you to exit from multiple nested loops.
for ($i=0; $i<=10; $i++) {
for ($j=0; $j<=10; $j++) {
if ($j == 5) break 2; // Exist this loop and the next one
echo $i; // 00000
}
}
Last update: 451 days ago
