For Loop statement
Complete pyramid
Copy codeThe Code is as follows:
// Print the pyramid
$ N = 25;
For ($ I = 1; $ I <= $ n; $ I ++ ){
// Space loop
For ($ k = 1; $ k <= $ n-$ I; $ k ++ ){
Echo '';
}
// Character Loop
For ($ j = 1; $ j <= $ I * 2-1; $ j ++ ){
If ($ I = 1 | $ I = $ n ){
Echo '.';
}
Else {
If ($ j = 1 | $ j = $ I * 2-1 ){
Echo '.';
} Else {
Echo '';
}
}
}
/*
For ($ j = 1; $ j <= ($ i-1) * 2 + 1; $ j ++ ){
Echo '.';
}*/
Echo '<br/> ';
}
Switch statement:
Copy codeThe Code is as follows:
/* $ A = "1 ";
Switch ($ ){
Case 1:
Echo $;
Break;
Default:
Echo "error ";
Break;
}
// Automatically convert strings and numbers
Processing When a Boolean value is encountered in the switch selection statement:
Copy codeThe Code is as follows:
$ B = true;
Switch ($ B ){
Case false:
Echo "mismatch ";
Break;
// Indicates that values other than false can be true ----- automatic conversion type
Case "1 ":
Echo "matched ";
Break;
Default:
Echo "ko ";
}
// 1. The default statement is last executed regardless of the order. If other cases are not matched, the default statement is executed.
// 2. If there is no break statement, the result of the next case will be output until there is a break.
While loop and do... while loop:
Copy codeThe Code is as follows:
/* While Loop
$ I = 0;
While ($ I <10 ){
Echo "paxster <br>". $ I;
$ I ++;
}
// Do... while loop -------- first execute and then judge, at least once
/* $ Do = 0;
Do {
Echo '<br/> Paxster ';
$ Do = $ do + 1;
} While ($ do <8 );*/
The combination of while loop and switch selection statement:
Constant:
Copy codeThe Code is as follows:
// Define constants ----- two methods
Define ('tax ', 200 );
Echo TAX;
Const Tab = 100;
Echo Tab;
Compile a simple calculator:
Step 1: Write the Input Interface
Copy codeThe Code is as follows:
<Html>
<Head>
<Title> </title>
</Head>
<Body>
<Form action = "CAL. php" method = "get">
<Input type = "text" placeholder = "enter a number" name = "num1">
<Input type = "text" placeholder = "enter a number" name = "num2">
<Select name = "operation">
<Option value = "+" >+ </option>
<Option value = "-">-</option>
<Option value = "*"> * </option>
<Option value = "/">/</option>
</Select>
<Input type = "submit" value = "computing">
</Form>
</Body>
</Html>
Step 2: Write the computing background code
Copy codeThe Code is as follows:
<? Php
$ Num1 = $ _ REQUEST ['num1'];
$ Num2 = $ _ REQUEST ['num2'];
$ Operation = $ _ REQUEST ['operation'];
$ Res = 0;
Switch ($ operation ){
Case '+ ':
$ Res = $ num1 + $ num2;
Break;
Case '-':
$ Res = $ num1-$ num2;
Break;
Case '*':
$ Res = $ num1 * $ num2;
Break;
Case '/':
$ Res = $ num1/$ num2;
Break;
Default:
Echo 'incorrect input ';
}
Echo 'result is '. $ res;
?>
Continue statement: Skip the code after this loop. You can specify the number of layers to jump out of, for example, continue 2; two layers to jump out, similar to break 2;
Goto statement: like the C language, jump to the Code with tags. The code in the middle is not executed and is ignored directly.
Copy codeThe Code is as follows:
// Goto statement
// I only run once
For ($ I = 0, $ j = 50; $ I <100; $ I ++ ){
While ($ j --){
If ($ j = 17) goto end;
}
}
Echo 'I = $ I ';
End:
Echo 'I ='. $ I. 'J = '. $ j;
Keep it simple, keep it clear. -- PAXSTER
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