PHP Learning Note--4. Control structure

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PHP Learning note--1. variables

PHP Learning note--2. Constants

PHP Learning note--3. operator

PHP Learning Note--4. Control structure

PHP Learning Note--5. Functions

1. Sequential structure

Execute from top to bottom in writing order

2. Branching structure

① Single-channel if

② two-way if. Else

③ Multi-path IF. else if: Else

④ multi-path switch. Case

Switch ($day) {

Case 1:echo ' Monday ';

Break

Case 2:echo ' Tuesday ';

Break

...

Default:echo ' Sunday ';

}

NOTE: switch. Case can only be for the exact value

And if.. else if: Else can be used to determine the scope after adding a condition

3. Cyclic structure

①while

An initial expression;

while (conditional expression) {

an evaluation expression;

Execute the statement;

}

Note: If the first cycle condition is false, it is not executed once

②do. While

An initial expression;

do {

an evaluation expression;

Execute the statement;

} while (conditional expression);

Even if the condition is false, it will be executed once

③for (initial expression, conditional expression, evaluation expression) {

Execute the statement;

}

④break and Continue

Break breaks the loop, jumps out of the loop

Continue interrupts this time, jumps to the next loop

4. File operation

Include (), if the introduced file does not exist, the view continues to execute down

Require (), if the introduced file does not exist, no longer continues execution

Header ("Content-type;text/html;charset=utf-8"); Set character sets

@zhnoah
Source: http://www.cnblogs.com/zhnoah/
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PHP Learning Note--4. Control structure