PHP数组

$arr2 = array(1,2,3,4,5,6);//索引数组,key从零开始

$arr3 = array('key1'=>'f','key2'=>'dd','key3'=>'f');//关联数组

$arr1 = array(1,'aa','sd',33,'ds');

$arr3[2]='ds';

$arr1 = array(
    'name'=>array('xx','xxx','xxxx'),
    'age'=>array('11','23','25')

);

$arr1['sex']='';
$arr1['name'][3]='xxxx';

for($a = 1;$a

while(list($key,$value)=each($arr1)){
echo ...    
}

$arr1 = array(
    'name'=>array('xx','xxx','xxxx'),
    'age'=>array(18,12,13),
    'sex'=>array('man','man','woman'),
);

echo "";
echo "";
echo "";
foreach($arr1 as $value){
    echo"";
    foreach($value as $val){
      echo "";
    }
    echo"";
}
echo "
标题
姓名
年龄
性别
$val
";

echo "
";

echo "";
echo "";
echo "";
foreach($arr1 as $key=>$value){
    echo "";
    echo "";
    echo "";
    echo "";
    echo "";
}

echo "
标题
姓名
年龄
性别
" .$value[0]."
" .$value[1]."
" .$value[2]."
";

$arr = range(1,9,3);// 1  4  7
//最小值1开始,最大值9,步长3

echo "
复制
";
var_dump($arr);

$arr2 = array_fill(2,3,'hello');

array(3) {
  [2]=>
  string(5) "hello"
  [3]=>
  string(5) "hello"
  [4]=>
  string(5) "hello"
}

array_push($arr1,'hh','aa','zz');//索引数组,键值由数组中最大键值决定

array_unshift($arr1,'qq','ww','rr','tt');//索引数组,键值从零开始

array_pop(数组名)   尾部移除
array_pop($arr1);//从尾部删除,一个删除一个

array_shift(数组名)   头部移除
array_shift($arr1);//从头部开始删除,一个删除一个

 for($i = 0; $i < count($arr); $i++){
        echo '第' . $i . '次循环' . $arr[$i] ."
";
    }