PHP control statement: If... Else_PHP tutorial

If... Else of the PHP control statement. If, elseif, and else statements are used to execute different actions based on different conditions. Conditional statements when writing code, you often need to perform different actions for different judgments. You can use the If, elseif, and else statements to execute different actions based on different conditions.

Condition Statement

When writing code, you often need to perform different actions for different judgments. You can use conditional statements in the code to complete this task.

If... else statement

Execute one piece of code when the conditions are met, and execute another piece of code when the conditions are not met.

Elseif statement

Use with if... else to execute a code block when several conditions are met.

If... Else statement

If you want to execute some code when a condition is set, and execute other code when the condition is not set, use the if... else statement.

Syntax

if (condition) code to be executed if condition is true;else code to be executed if condition is false;

Instance

If the current date is Friday, the following code will output "Have a nice weekend! ", Otherwise it will output" Have a nice day! ":

＜?php$d=date("D");if ($d=="Fri") { echo "Hello! "; echo "Have a nice weekend!"; echo "See you on Monday!"; }?＞

ElseIf statement

To execute code when multiple conditions are created, use the elseif statement:

Syntax

if (condition) code to be executed if condition is true;elseif (condition) code to be executed if condition is true;else code to be executed if condition is false;

Instance

If the current date is Friday, the following example will output "Have a nice weekend! ", If it is Sunday, output" Have a nice Sunday! ", Otherwise output" Have a nice day! ":

＜?php$d=date("D");if ($d=="Fri") echo "Have a nice weekend!"; elseif ($d=="Sun") echo "Have a nice Sunday!"; else echo "Have a nice day!"; ?＞

Explain and else statements are used to execute different actions based on different conditions. Conditional statements when writing code, you often need to perform different actions for different judgments. You can...