php 数组排序各种方法总结

<?php
 $languages=array(
  'c'=>'php',
  'd'=>'asp',
  'a'=>'jsp',
  'b'=>'java'
 );
 krsort($languages);
 foreach($languages as $key=>$val){
  echo "$key = $val".'<br>';
 };
?>

asort($languages);
print_r($languages);
echo "<br>";
rsort($languages);
print_r($languages);

sort($languages);
foreach($languages as $key=>$val){
 echo "languages[$key] = $val".'<br>';
};

<?php
$ar1 = array("10", 100, 100, "a");
$ar2 = array(1, 3, "2", 1);
array_multisort($ar1, $ar2);

var_dump($ar1);
var_dump($ar2);
?>

array(4) {
[0]=> string(2) "10"
[1]=> string(1) "a"
[2]=> int(100)
[3]=> int(100)
}
array(4) {
[0]=> int(1)
[1]=> int(1)
[2]=> string(1) "2"
[3]=> int(3)
}

<?php
$ar = array (array ("10", 100, 100, "a"), array (1, 3, "2", 1));
array_multisort ($ar[0], SORT_ASC, SORT_STRING,
                 $ar[1], SORT_NUMERIC, SORT_DESC);
?>

------排序前输出------
array(8) { [0]=> array(1) { ["score"]=> int(60) }
 [1]=> array(1) { ["score"]=> int(70) }
 [2]=> array(1) { ["score"]=> int(80) }
 [3]=> array(1) { ["score"]=> int(90) }
 [4]=> array(1) { ["score"]=> int(20) }
 [5]=> array(1) { ["score"]=> int(10) }
 [6]=> array(1) { ["score"]=> int(50) }
 [7]=> array(1) { ["score"]=> int(30) } }
------排序后输出------
array(8) { [0]=> array(1) { ["score"]=> int(90) }
 [1]=> array(1) { ["score"]=> int(80) }
 [2]=> array(1) { ["score"]=> int(70) }
 [3]=> array(1) { ["score"]=> int(60) }
 [4]=> array(1) { ["score"]=> int(50) }
 [5]=> array(1) { ["score"]=> int(30) }
 [6]=> array(1) { ["score"]=> int(20) }
 [7]=> array(1) { ["score"]=> int(10) } }

$t1 = microtime(true);
// ... 执行代码 ...
$t2 = microtime(true);
echo '耗时'.round($t2-$t1,3).'秒';

<?php
$start_time=microtime(true); //获取程序开始执行的时间
 echo "hello world!<br />"; //你执行的代码
 $end_time=microtime(true);//获取程序执行结束的时间
 $total=$end_time-$start_time; //计算差值
 echo "此php文件中代码执行了{$total}秒";
?>

$arr = array(
    "name" => "manson",
    "age" => 23,
    "sex" => 1
);
 
$json_str = json_encode($arr);
var_dump($json_str);

$json_str = '{"name":"manson","age":23,"sex":1}';
 
$arr = json_decode($json_str,true);
var_dump($arr);

{"a":1,"b":2}

$s=$_POST['data'] ;//or $_GET['data']

 {"a":1,"b":2}

$s='{"a":1,"b":2}';

$s=stripslashes($_POST['data']) ;

$content = json_decode($content);
foreach ($content->data as $key) {
    echo '<li><a target="_blank" href="'.$key->b_url.'">'.$key->b_title.'</a></li>';
}

<?php
/* Generate Password
* Length : 8
*/
$str = “0123456789abcdefghijklmnopqrstuvwxyz”;   //   输出字符集
$n = 8;   //   输出串长度
$len = strlen($str)-1;
for($i=0 ; $i<$n; $i++){
$s .=  $str[rand(0,$len)];
}
echo $s . “<br/>”;
?>

<?php
function getRandStr($length) { 
$str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randString = '';
$len = strlen($str)-1;
for($i = 0;$i < $length;$i ++){
$num = mt_rand(0, $len);
$randString .= $str[$num];
}
return $randString ; 
}

//使用方法如下
$test=getRandStr($length=5);
echo $test;
?>

<?php
 /**
  */
 function createRandomStr($length){
  $str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62个字符
  $strlen = 62;
  while($length > $strlen){
   $str .= $str;
   $strlen += 62;
  }
  $str = str_shuffle($str);
  return substr($str,0,$length);
 }
echo createRandomStr(10);

?>

<?php
 /**
  *@blog <www.111cn.net>
  */
 function createRandomStr($length){
  $str = array_merge(range(0,9),range('a','z'),range('A','Z'));
  shuffle($str);
  $str = implode('',array_slice($str,0,$length));
  return $str;
 }
 echo createRandomStr(10);
?>

function _http_curl_post($url,$data)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 4);
    curl_setopt($ch, CURLOPT_TIMEOUT,4);
         
    if($data){
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "value=".json_encode($data));  //请求参数转为json格式
    }
    curl_setopt($ch, CURLOPT_HEADER, false);
    $string = curl_exec($ch);
    curl_close($ch);
    return $string;
}

$params = array();
$params['id']       = 1
$params['web_name']   = '好脚本';
$params['web_url']    = 'http://www.111cn.net/';
$params['web_miaoshu']      = '脚本编程示例';
$data = _curl_post($url,$params);
$arr =json_decode($data);

function _https_curl_post($url, $vars) 
{ 
    foreach($vars as $key=>$value)
    {
        $fields_string .= $key.'='.$value.'&' ;
    } 
    $fields_string = substr($fields_string,0,(strlen($fields_string)-1)) ;
    $ch = curl_init();  
    curl_setopt($ch, CURLOPT_URL,$url); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,  2);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);  // this line makes it work under https
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_POST, count($vars) );
    curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);     
    $data = curl_exec($ch);        
    curl_close($ch);  
       
    if ($data)
    {
        return $data;
    }
    else
    {
        return false;
    }
}