PHP自定义函数&数组

<?php

//生成随机数 和 时间函数

//echo rand();

//echo "<br>";

//echo rand(0,10);

//echo time();//时间戳

//2017-02-10 08:46:12

date_default_timezone_set("Asia/Shanghai");

//echo date("Y-m-d h:i:s");//默认转换当前时间

//echo date("Y-m-d h:i:s",'1386688343');

//echo strtotime("2013-12-10 11:12:23");

//字符串的处理

//$str = 'Hello World!!!';

//echo strlen($str);

//$str1='Abc';

//$str2='abc';

//echo strcmp($str1,$str2);

//echo strcasecmp($str1,$str2);

//echo strtoupper($str2);

//echo strtolower($str1);

//$str = "a|B|c|d";

//$str1 = explode("|",$str);

//echo implode("&",$str1);

//echo substr($str,1,3);

//echo str_replace("|","&",$str);

//echo substr_replace($str,"%",1,1);

//$str = "hello3 world4 ashdf223sdfa2323sd45454";

//preg_match("/\d/",$str,$str2);

//preg_match_all("/\d/",$str,$str3);

//var_dump($str3);

//$str4 = preg_replace("/\d/", "数字", $str);

//var_dump($str4);

//$str5 = preg_split("/\d/",$str);

//var_dump($str5);

//function hansm($v)

//{

//    $v++;

//    return $v;

//}

//$temp = hansm(5);

//echo $temp;

//function test($a, $b = 3)

//{

//    return $a + $b;

//}

//

//echo test(2,4);

//function test2()

//{

//    $arr = func_get_args();

//    return $arr;

//}

//var_dump(test2(2,3));

//$arr = array();

//var_dump($arr);

$arr = array('x', 'y', 34);

$arr2 = array(

    'x' => 'a',

    'y' => 'b',

    'z' => 'c',

    9 => 35

);

//$arr_merge=array_merge($arr,$arr2);

//var_dump($arr_merge);

//echo $arr2[2];

//var_dump($arr2);

//array_push($arr2,'xxx');

//var_dump($arr2);

//var_dump(in_array('v',$arr2));

//$arr_reverse = array_reverse($arr2);

//var_dump($arr_reverse);

//unset($arr2);

//$ar2 = null;

//var_dump($arr2);

//for($i=0;$i<count($arr2);$i++)

//{

//

//}

foreach ($arr2 as $k)

{

    var_dump($v);

}

foreach ($arr2 as $k=>$v){

    var_dump($arr2[$k]);

}

//echo $v;