for/while/foreach()的不同

<？php

//定义数组

$x=array("one","two","three");

//for 循环

for($=0,$i<count($X),$i++){

echo $X[i];

}

//while 循环

$i=0;

while($i<count($X)){

echo $X[i];

$i++;

}

//foreach 循环值，健值循环

foreach ($x as $value)

{    echo $value . "<br>";}

foreach ($x as$key=> $value)

{    echo $key .$value . "<br>";}

?>