Small examples about php arrays and loops-PHP Tutorial-php.cn

//1. Use a loop statement to output any two-dimensional array.
$arr=array(
array(1,2,3,4),
array(5,6,7,8),
array(9,10,11,12),
array(13,14,15 ,16)
);
foreach ($arr as $var){
foreach ($var as $val1){
echo "$val1 ";
}
echo "
";
}
echo "
";
//2. Use the loop control statement to output the Yang Hui triangle.
function yanghuisanjiao($line){
$sc[][]=array();
$sc[0][0]=1;
for($i=1;$i<=$line;$i++) {
for($j=0;$j<=$i;$j++){
if($j==0 or $i==$j){
$sc[$i][$j]=1 ; //Set the first number and last number of each line to 1
}else{
$sc[$i][$j]=$sc[$i-1][$j-1]+$ sc[$i-1][$j];
}
}
}
foreach ($sc as $value){
foreach($value as $v1){
echo $v1.' ';
}
echo '
';
}
}
yanghuisanjiao(5);
echo "
";
//3. Use Loop and predefined variables, get multiple parameters. The number of parameters is undetermined.
function avg(){
$ags=func_get_args();
$sum=0;
foreach ($ags as $v){
$sum+=$v;
}
return 'The average is:'.$sum /func_num_args();
}
echo avg(1,2,3,4,5,6,7);
//4. Use a loop to output a two-dimensional array, and Find the sum of the diagonal elements of the rectangle.
function getSum($theCount){
$b=0;
echo '
';
echo "";
for($i=1;$i<=$theCount;$i++ ){
echo "
";
for($j=1;$j<=$theCount;$j++){
if($j==$i || $theCount+1-$i== $j){
echo "
";
$b=$b+$j;
if($j==$i && $theCount+ 1-$i==$j){
$b=$b+$j;
}
}
else{
echo "
";
}
}
echo "< /tr>";
}
echo "

$j $j
";
echo "The sum of the diagonal elements is:".$b;
}
getSum(6);
?>

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