PHP数组的基本操作及遍历数组的经典操作实例

<"hello";
var_dump($arr);

echo $arr[2];//取值 

关联数组


$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
echo $arr["sex"]; 

遍历数组

//for循环遍历  适用于索引数组
 $arr = [1,5,6,9,4,6,8];
for($i=0;$i<count($arr);$i++){
 echo $arr[$i].'<br>'; 
} ;

//foreach循环遍历  适用于索引和关联数组
$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
foreach($arr as $k=>$v){
 //echo $k.':'.$v.'<br>'; 
 echo "{$k}:{$v}<br>";
}; 


$arr = [1,5,6,9,4,6,8];
foreach($arr as $k){
 echo $k.'<br>'; 
};


$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
var_dump(each($arr));


 list($a,$b) = array(name,小李);
echo "{$a},{$b}"; 


list和each结合遍历
/* $arr = array("name"=>"小李","sex"=>"女","age"=>"20");
while(list($k,$v)=each($arr)){
 echo "{$k}:{$v}<br>";
} */

指针遍历
/* $arr = array("name"=>"小李","sex"=>"女","age"=>"20");
echo current($arr);//取value
echo key($arr);//取key
next($arr);
echo current($arr);
echo key($arr);
prev($arr);
echo current($arr);
echo key($arr);
end($arr);
echo current($arr);
echo key($arr);
reset($arr);
echo key($arr).':'.current($arr).'<br>'; */