Php Process Control

Source: Internet
Author: User

If statement, switch statement, while loop, do... While LOOP, for loop, foreach loop, break interrupt loop, and continue command. The following shows how to use the week function.

Three process control structures of the program

1. Ordered Structure
2. Select a structure
3. Loop Structure

 

The result is as follows:

The Code is as follows: Copy code
$ D = date ("D ");
If ($ d = "Tue ")
Echo "Today is Tuesday ";
Else
Echo "today is not Tuesday ";
?>

The array can be used to determine the day of the week.

The execution result should be as follows:

The Code is as follows: Copy code

$ Srttime = date ("w", time ());
$ Array = array ('day', 'yi', '2', '3', '4', '5', '6 ');
$ Todaytime = date ("Y, m, D, week {$ array [$ srttime]}", time ());
Echo $ todaytime;
?>

1. if (condition 1 ){

? Why? /P>

}

<HTML>
<HEAD>
<TITLE> IF-1 </TITLE>
</HEAD>
<BODY>
<?
$ A = 100;
If ($ a == 100 ){
Echo "A is 100 .";
}
?>
</BODY>
</HTML>

Or

If (condition 1 ){

? Why? /P>

} Else {

? Too many? /P>

}

<HTML>
<HEAD>
<TITLE> IF... ELSE-1 </TITLE>
</HEAD>
<BODY>
<?
$ A = 120;
If ($ a <100 ){
Echo "A was small than 100 .";
}
Else {
Echo "A was big than 100 .";
}
?>
</BODY>
</HTML>

 

<HTML>
<HEAD>
<TITLE> IF... ELSE-2 </TITLE>
</HEAD>
<BODY>
<?
$ File = "files.txt ";
If (file_exists ($ file )){//? Z query? N case?
Echo "? Yes? N case of files.txt? Hot? <BR> ";
Readfile ($ file );//? Outbound? N case? Hot? Br/>}
Else {
Echo "? O here? N case <BR> ";
}
?>
</BODY>
</HTML>


Or

If (condition 1 ){

? Why? /P>

} Elseif {

? Too many? /P>

} Elseif {

? Too many? /P>

}

...........

Else {

? Why?

}

<HTML>
<HEAD>
<TITLE> IF... ELSEIF... ELSE-1 </TITLE>
</HEAD>
<BODY>
<?
$ A = 100;
$ B = 200;
If ($ a> $ B ){
Echo "a is bigger than B ";

} Elseif ($ a ==$ B ){
Echo "a is equal to B ";

} Else {
Print "a is smaller than B ";
}
?>
</BODY>
</HTML>


2. while (condition 1) {// condition? Why? ??

? Why? /P>

}

<HTML>
<HEAD>
<TITLE> WHILE </TITLE>
</HEAD>
<BODY>
<?
$ A = 1;
While ($ a <10 ){
Echo "$ a <BR> ";
$ A ++;
}
?>
</BODY>
</HTML>

 

3. do {

? Why? /P>

} While (condition); // condition? Why? ??

<HTML>
<HEAD>
<TITLE> Do... WHILE-1 </TITLE>
</HEAD>
<BODY>
<?
$ A = 1;
Do {
Echo "$ a <BR> ";
$ A ++;
} While ($ a <10)
?>
</BODY>
</HTML>

 

4. for (initial condition; Criterion? Too many? Condition change ?? Why? {

? Why? /P>

}

<HTML>
<HEAD>
<TITLE> For-1 </TITLE>
</HEAD>
<BODY>
<?
For ($ a = 1; $ a <10; $ a ++)
{
Echo "$ a <BR> ";
}
?>
</BODY>
</HTML>


5. break? Why? Too many? Circle

<HTML>
<HEAD>
<TITLE> BREAK </TITLE>
</HEAD>
<BODY>
<?
$ Abc [0] = '0 ';
$ Abc [1] = '1 ';
$ Abc [2] = '2 ';
$ A = 0;
While ($ a <4)
{
If ($ abc [$ a] = '2') {// if? Why? Hop? While ()? Circle
Break;
}
Echo "$ ";
$ A ++;
}
?>
</BODY>
</HTML>


6. continue // medium? Why? Too many? Circle, jump? Circle ???? Next time

<HTML>
<HEAD>
<TITLE> CONTINUE </TITLE>
</HEAD>
<BODY>
<?
For ($ I = 10; $ I> 1; $ I --){
If ($ I = 2) {// if? Why? ? ? For ()? Circle ,?? Next ()? Circle
Continue;
}
Echo "$ I <br> ";
}
?>
</BODY>
</HTML>


7. switch (condition ){
Case 'case value 1 ':
? Why? Nbsp; // condition? If the case value is the same, then? Partially? Why? It does not stop until it encounters a break.
Break;
Case 'case value 2:
? Too many? Br/> break;
............
Default:
? Why?
Break;

}


<HTML>
<HEAD>
<TITLE> SWITCH </TITLE>
</HEAD>
<BODY>
<?
Switch ($ I ){
Case 0:
Echo "I equals 0 ";
Case 1:
Echo "I equals 1 ";
Case 2:
Echo "I equals 2 ";
}
?>
</BODY>
</HTML>


 

<HTML>
<HEAD>
<TITLE> Switch-SWITCH </TITLE>
</HEAD>
<BODY>
<?
Switch ($ ){
Case '1 ':
Echo "one ";
Break;
Case '2 ':
Echo "two ";
Break;
Case '3 ':
Echo "three ";
Break;
Case '4 ':
Echo "four ";
Break;
Case '5 ':
Echo "five ";
Break;
Default:
Echo "ZERO ";
Break;
}
?>
</BODY>
</HTML>

Notes

In PHP syntax, a semicolon is added to the end of each instruction, but not to the end of part of the ending symbol.
In the process part of the separator, both use {as the part of the start, use} as the end, and C language is the same. However, C can define the beginning and end of a in statement (such as Pascal), but PHP cannot define a begin statement.

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