PHP development basic essay 2: selection, loop, function, array, coding

1. Multiple choice

<?php
$num=5;
switch($num%3)
{
	case 0:
		echo '十全十美';
		break;
	case 1:
		echo '一帆风顺';
		break;
	default:
		echo '两全其美';
		break;
	}
?>

2.循环
for，while，do while

for($i=1;$i<=10;$i++)
{
	echo"{$i}:锄禾日当午<br>";
	}
?>

foreach traverses the array:

$stu=array('berry','merry','rose');
foreach($stu as $v)
{
	echo $v.'<br>';
}
foreach($stu as $key=>$value)
{
	echo "($key)-($value)<br>";
}

3. Function
Predefined function:
is_int ();
custom function:

function show()
{
	echo '锄禾日当午<br>';}
show();

function cal($num1,$num2)
{
	$num=$num1+$num2;
	echo "{$num}";}
cal(10,20);

function cal($num1,$num2)
{
	$num=$num1+$num2;
	echo "{$num}";
	return $num;
}
echo cal(10,20);

4. Multidimensional array

$stu=array(
	array('tom','yangyang','wanganshi'),
	array('李白','dufu')
	);
echo $stu[0][0];

$stu1=array(
	array('tom'=>'111','yangyang'=>'222','wanganshi'=>'333'),
	array('李白'=>'444','dufu'=>'555')
	);
echo $stu1[0]['yangyang'];

5. The solution of garbled page
output Chinese garbled
text : the browser does not know the character encoding, add at the top of the entire page:

<meta charset="utf-8">

Or at the top of the php code

header('Content-Type:text/html;charset=utf-8');