PHP loop structure example explanation_PHP tutorial

for loop statement

Print pyramid

Complete pyramid

Copy code The code is as follows:

//Print pyramid
$n=25;
for($i=1;$i //Space loop
for($k=1;$k                                                                                                            || $ j==$i*2-1){
                                                                                                                                                                                                                            . 🎜>                                                                                                                                                        🎜> for($j=1;$j echo '.';
}*/ echo '
';

}



switch statement:



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The code is as follows:


/*$a="1";
switch ($a) {

case 1:

echo $a;
break;

default:

echo "Error";
break;

} //Automatically convert strings and numbersHandling of Boolean values ​​encountered in switch selection statements:

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The code is as follows:


$b=true;
switch($b){
case false:
echo "Does not match";
break;
//Represents non-false values ​​​​that can be true-----automatic conversion type

        case "1":
                                                                                                                                                                                                                                                          . "ko";
}

//1. The default statement is executed last regardless of the order. If no other case is matched, the default statement is executed //2. If there is no break statement, then The result of the next case will be output until there is a break.

while loop and do..while loop:

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The code is as follows:

/*while loop
$i=0;
while($i echo "paxster
".$i;
$i++;
}
//do..while loop--------execute first and then judge, execute at least once
/*$do=0;
do{
echo '< ;br />Paxster';
$do=$do+1;
}while($do

The combination of while loop and switch selection statement:

Constant:

Copy code The code is as follows:

//Define constants-----Two methods
define('TAX',200);
echo TAX;

const Tab=100;
echo Tab;

Write a simple calculator:

step1: Write input interface

Copy code The code is as follows:

 

 
  + option> ">/

> ;



step2: Write calculation background code

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The code is as follows: $num1=$_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 'The result is'.$res;
?>

continue statement: skip the code after this loop. You can specify the number of levels to jump out of, such as continue 2; it means jumping out of two levels, similar to break 2;

goto statement: Just like the C language, jump to the labeled code, the code in the middle will not be executed and will be ignored directly.

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The code is as follows:

//goto statement
//i is only executed once
for($i=0,$j=50;$i while($j --){
                                                                                                                                                                                                                 . .$i.'j='.$j;


Keep it simple,keep it clear.——PAXSTER

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truehttp: //www.bkjia.com/PHPjc/732384.htmlTechArticlefor loop statement prints the pyramid. The complete pyramid copy code is as follows: //Print pyramid $n=25; for( $i=1;$i=$n;$i++){ //Space loop for($k=1;$k=$n-$i;$k++){ echo ''; } //Characters...