PHP loop structure example explanation_PHP tutorial-PHP Tutorial-php.cn

PHP loop structure example explanation_PHP tutorial

WBOY

Release： 2016-07-13 10:39:16

Original

987 people have browsed it

for loop statement
PHP loop structure example explanation_PHP tutorial

Print pyramid

PHP loop structure example explanation_PHP tutorial

Complete pyramid

Copy code The code is as follows:

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

echo '
';

}

switch statement:

Copy code

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:

Copy code

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:

Copy code

The code is as follows:

/*while loop
$i=0;
while($i<10){
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<8);*/

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:

step2: Write calculation background code

Copy code

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. PHP loop structure example explanation_PHP tutorial