10 五章 添加删除数组元素 定位数组元素

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<?php
    $states = array("ohio","new york");
    //数组头添加元素
    array_unshift($states,"california","texas");
    //array_push();数组尾添加元素
    //array_shift();从数组头删除元素
     //array_pop();从数组尾删除元素
    $count = 0;
    for($count = 0; $count < 4; $count++)
    {
        echo "$states[$count] ";
    }

    //in_array() 索引数组
    echo "";
    $state = "ohio";
    if(in_array($state,$states))
        echo "find it ";

    //array_key_exists() 关联数组键值
    echo "";
    $state1["delaware"] = "december 7,1787";
    $state1["ohio"]        = "march 1,7895";
    if(array_key_exists("ohio",$state1))
        printf("find ohio, %s ",$state1["ohio"]);

    //array_search()
    //state2[ohio] = "march 1";
    //array_search("march 1",$state2);

    //array_keys() 数组键
    $key = array_keys($state1);
    print_r($key);

    //array_values 全部值
    echo "";
    print_r(array_values($state1));
?>

california
texas
ohio
new york

find it

find ohio, march 1,7895
Array ( [0] => delaware [1] => ohio )
Array ( [0] => december 7,1787 [1] => march 1,7895 )