Where is the PHP process control?
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PHP process control is mainly if and switch process control.
When you write code, you often need to perform different actions for different judgments. You can use conditional statements in your code to accomplish this task.
In PHP, the following conditional statements are provided:
If statement-executes code when the condition is established
If...else statement-executes one block of code when the condition is established and another block of code when the condition is not
If...else if....else statement-executes a block of code when one of several conditions is true
Switch statement-executes a block of code when one of several conditions is true
PHP-if statement
The if statement is used to execute code only if the specified condition is established.
Grammar.
If (conditional)
{
Code to be executed when the condition is established
}
If the current time is less than 20, the following example outputs "Have a good day!":
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PHP-if...else statement
To execute one block of code when the condition is established and another block of code when the condition is not, use the if....else statement.
Grammar.
If (conditional)
{
Code executed when the condition is established
}
Else
{
Code executed when the condition does not hold
}
If the current time is less than 20, the following example will output "Have a good day!", otherwise output "Have a good night!":
PHP-if...else if....else statement
To execute a block of code when one of several conditions is true, use the if....else if...else statement. .
Grammar.
If (conditional)
{
Code that executes when the if condition is established
}
Else if (conditional)
{
Code that executes when the elseif condition is established
}
Else
{
Code executed when the condition does not hold
}
The following example outputs "Have a good morning!" if the current time is less than 10, and "Have a good day!" if the current time is not less than 10 and less than 20, otherwise "Have a good night!":
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