Php数组2

数组的定位：

1.搜索；in_array();返回布尔型；

    $ary_t = array(
                "name" , "killy",
                "age"  , "18",
                "love" ,"sleep",

     );
    if(in_array("name",$ary_t)){
        echo 'name is in the array of \$ary_t';
    }else{
        echo 'name is not in the array of \$ary_t ';
    }
    //结果
    //name is in the array of \$ary_t
?>

2.搜索关联数组键

arrary_key_exists(查找值，数组);返回布尔值；

arrary_search (查找值,数组)

 

    $ary_t = array(
                "name" => "killy",
                "age"  => "18",
                "love" => "sleep",

     );
     //判断是否有健值"age";
    if(array_key_exists("age",$ary_t)){
        echo "name is {$ary_t['age']}"."";
    }else{
        echo "the array has not the key of 'age'";
    }
    //判断时否有数组值"sleep";
    if(array_search("sleep",$ary_t)){
        echo "the love is sleep;";
    }else{
        echo "thc array has not the content of 'sleep'";
    }
//  结果:
//  name is 18
//  the love is sleep;

?>

3.获取数组键与值；

array_keys(数组)；返回一组数组；

array_values();   返回一组数组；

 

    $ary_t = array(
                "name" => "killy",
                "age"  => "18",
                "love" => "sleep",

     );
    //获取数组键 ；
    $key = array_keys($ary_t);
    print_r($key);
    echo "";
    //获取数组值 ；
    $content = array_values($ary_t);
//    print_r($content);
//    结果
//    Array ( [0] => name [1] => age [2] => love )
//    Array ( [0] => killy [1] => 18 [2] => sleep )
//
?>

指针来控制数组；

key(); 获取当前数组键 ；

current();获取当前数组值；

each(); 获取当前数组键和值；

next();移到下一个元素位置；

prev()；移动上一个元素位置；

reset(); 将指针移动第一个元素位置；

end(); 将指针移动到最后一个元素的位置；

 

    $ary_t = array(
                "name" => "killy",
                "age"  => "18",
                "love" => "sleep",

     );
    //遍历键值；
    while($key = key($ary_t)){
        echo $key."\t";
        next($ary_t);
    }
    echo "";
    //上面编加之后。数据的指针已经到最后一个元素，要重置到首位；
    reset($ary_t);
    //偏历数值；
    while ($content = current($ary_t)) {
        echo $content."\t";
        next($ary_t);
    }
?>

向函数传递数组值；

array_walk();

参考下：http://www.w3school.com.cn/php/func_array_walk.asp