Summary of basic PHP knowledge points (2)

PHP basic knowledge point summary (2) 2. PHP process control structure

Branch structure:

Single condition branch structure bidirectional condition branch structure multi-direction condition branch structure nest condition branch structure
If (expression ){
...... If (expression ){
} Else {elseif (expression ){...

......}

} Elseif (expression ){

---------------- If (expression ){

Switch (expression ){...
} Else {
Case value 1 :...

...}

Break ;}

Case value 2:
...
Break;
Case value 3:
...
Break;
Default:
...
}





Loop structure:

While statement: do... while Statement: for statement:
While (expression) {do {for (initialization; conditional expression; increment ){
.........
} While (expression );}

Special process control statement:

Break: interrupt the current loop, that is, terminate the execution of the loop.
Continue: it can only be used inside a loop. the function is to skip this loop and execute the next loop.
Exit: exit the current script regardless of the structure.