php和mysql web development (一) how to use php_array

<?php
$arr=range(1,10,1);
echo implode(',',$arr).'<br/>';

//foreach
foreach ($arr as $v)
{echo $v;}

reset($arr);

//each list
while(list($key,$value)=each($arr))
{
    echo $key,$value;
}
reset($arr);
rsort($arr);
echo implode(',',$arr).'<br/>';

function compare($x,$y)
{
    if(x > y) {
    return 1;}
    else if(x < y){ 
    return -1;}
    else {
    return 0;}
}
reset($arr);
usort($arr,'compare');
echo implode(',',$arr) . '<br/>';

$arr=array_reverse($arr);
echo implode(',',$arr) . '<br/>';

function my_multiply(&$value,$key,$factor)
{
    $value *=$factor;
    echo $key;
}

array_walk($arr,'my_multiply',3);
echo implode(',',$arr) . '<br/>';

$ac=array_count_values($arr);
print_r($ac);

$arr1=array('name'=>'jame');
extract($arr1);
echo $name;