php数组遍历

<?php
$arr = array('a','b','c','d','e','f');
//for语句只能遍历索引数组
for($i = 0; $i < 6; $i++){
    echo $arr[$i];
    echo "<br />";
}
echo '<hr />';

$arr1 = array('k1'=>'a','k2'=>'b','c','d','e','f');
// var_dump($arr1);
//foreach专门为数组而设计的
foreach($arr1 as $value){
    echo $value;
    echo '<br />';
}
echo '<hr />';

foreach($arr1 as $k => $v){
    echo $k.' => '.$v.'<br />';
}
?>

<?php
$arr = array('k1'=>'a','k2'=>'b','c','d','e');
// var_dump(each($arr));
//'k1' => 'a';
// [0] => string(2) 'k1';
// ['key'] => string(2) 'k1';

while(list($key, $value) = each($arr)){
    echo $key.' => '.$value;
    echo '<br />';
}
reset($arr); //因为通过遍历，数组指针已经指向了最后，所以要释放指针
var_dump(each($arr));
?>

<?php
$arr = array('a','b','k1'=>'c','k2'=>'d','e');
var_dump(next($arr));
var_dump(prev($arr));
var_dump(end($arr));
var_dump(reset($arr));
?>