Let's talk about the format of the switch () statement
switch (expression) {
Case Match 1:
When matching 1 and the expression match the successful execution of the Code;
Break
Case Match 2:
When matching 2 and the expression match the successful execution of the Code;
Break
Default
If the case statement does not have the code executed with the expression successfully;
}
It is very important to understand how switch is performed. The switch statement executes one line at a line (actually a statement-taking statement). No code is executed at the beginning. PHP begins executing a statement only if the value in one case statement matches the value of the switch expression until the switch's program segment ends or the first break statement is encountered. If you do not write a break at the end of the statement section of the case, PHP will continue to execute the statement section in the next box.
Example:
Copy Code code as follows:
<?php
Switch ($i) {
Case 1:
The value of echo "$i is 1";
Break
Case 2:
The value of echo "$i is 2";
Break
Case 3:
The value of echo "$i is 3";
Break
Default
The value of echo "$i is not 1, 2, 3";
}
?>
The statement in a case can also be empty, which simply transfers control to the statement in the next box, knowing that the statement block for the next case is not empty, so that multiple values match the consent code block is implemented:
Output the same statement when the value of $i is 1 or 2 or 3 o'clock:
Copy Code code as follows:
<?php
Switch ($i) {
Case 1:
Case 2:
Case 3:
echo "$i value of $i is 1 or 2 or 3";
Break
}
?>
