欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

PHP数组常用招式_PHP教程

程序员文章站 2024-01-01 23:59:34
...
//读取数组
$arr=array("xx"=>"叉叉","yy"=>"歪歪");
echo "读出第一个:".$arr[xx];//统计数组个数
$array=array(aaa,bbb,ccc,ddd);
echo "数组个数为:".count($array)."n"; //计算数组单元数目或对象中属性个数 等同sizeof()//快速创建数组
$arr_range = range(0,20,2); //定义值的范围 最小0 最大6 步长为2(之差,可选)
$arr_range2 = range("A","N");
echo "用range()快速创建数字数组:";
print_r($arr_range);
echo "n";
echo "用range()快速创建字母数组:";
print_r($arr_range2);
echo "n";//测试数组
if(is_array($arr_range)){ echo "$arr_range是数组!n"; }else{echo "不是数组!n";}//拆分数组
$str="小猪,小猫,小狗";
list($a,$b,$c) =explode(",",$str);
echo "数组拆分为:".$a ." ". $b ." ". $c;
echo "
";//在数组头添加元素
$oldarr=array("小张","小李","小王","小赵");
$newarr=array_unshift($oldarr,"小孙","小周","小武");
print_r($oldarr); //这个数组变量在头部,被加入新的
echo "个数为:".print_r($newarr);//在数组尾部添加元素
$oldarr=array("小张","小李","小王","小赵");
$newarr=array_push($oldarr,"小孙","小周","小武");
print_r($oldarr); //这个数组变量在尾部,被加入新的
echo "个数为:".print_r($newarr);//从数组头删除值
$oldarr=array("小张","小李","小王","小赵");
$newarr=array_shift($oldarr);
print_r($newarr); //返回删除的值
print_r($oldarr); //返回被删除的后剩余的//从数组尾部删除值
$oldarr=array("小张","小李","小王","小赵");
$newarr=array_pop($oldarr);
print_r($newarr); //返回删除的值
print_r($oldarr); //返回被删除的后剩余的//定位元素:搜索数组
$search ="小刘";
$oldarr =array("小张","小李","小王","小赵","小刘");
if(in_array($search,$oldarr)){ echo "数组中有:".$search."n";}else{echo "数组中没有:".$search."n";}//定位元素:搜索关联数组"键"
$oldarr["水果1"]="西瓜";
$oldarr["水果2"]="桃子";
$oldarr["水果3"]="葡萄";
if(array_key_exists("水果2",$oldarr)){ printf("你选的水果是: %s n",$oldarr["水果2"]);} else {echo "不存在这个!";}//定位元素:搜索关联数组"值"
$oldarr["水果1"]="西瓜";
$oldarr["水果2"]="桃子";
$oldarr["水果3"]="葡萄";
$found=array_search("西瓜",$oldarr);
if($found){ printf("%s 的值是: %s n",$found,$oldarr[$found]);} else {echo "不存在这个!";}//获取数组中的"键"
$oldarr=array("力量"=>"拳击","速度"=>"跑步");
while($key = key($oldarr)){
printf("%s
",$key);
next($oldarr); //每次key不会移动指针,需要next来移动指针
}//获取数组中的"值"
$oldarr=array("力量"=>"拳击","速度"=>"跑步");
while($val = current($oldarr)){
printf("%s
",$val);
next($oldarr); //每次key不会移动指针,需要next来向后移动指针 prev()向前移动一个 reset()是移动首位 end()是移动末尾
}//历遍数组中的"键和值"
$arr=array("one", "two", "three");
foreach ($arr as $value){
echo "Value: " . $value . "
";
}//统计数组元素出现频率(结果是值数量)
$arr=array("one", "two", "three", "two", "three");
print_r(array_count_values($arr));//确定唯一的数组元素(输出不重复的内容)
$arr=array("one", "two", "three", "two", "three");
print_r(array_unique($arr));//逆置数组元素顺序(键和值)
$arr=array("one", "two", "three", "four", "five");
print_r(array_reverse($arr));//置换数组和值
$arr=array("one", "two", "three", "four", "five");
print_r(array_flip($arr));//正序数组排序(键和值关联不在保持)
$arr=array("one", "two", "three", "four", "five");
sort($arr);
print_r($arr);//正序数组排序(键和值关联保持)
$arr=array("one", "two", "three", "four", "five");
asort($arr);
print_r($arr);//逆序数组排序(键和值关联不保持)
$arr=array("one", "two", "three", "four", "five");
rsort($arr);
print_r($arr);//逆序数组排序(键和值关联保持)
$arr=array("one", "two", "three", "four", "five");
arsort($arr);
print_r($arr);//自然排序数组(经典排序)
$arr=array("a1", "a3", "a10", "a22", "a19");
natsort($arr);
print_r($arr);//自然排序数组(经典排序,不区分大小写的)
$arr=array("A1", "a3", "a10", "A22", "a19");
natcasesort($arr);
print_r($arr);//按键值对数组排序
//ksort();
//以逆序对数组键排序
//krsort();
//根据用户自定义规则排序
$arr=array('2009-02-06','2009-02-10','2009-02-13','10-06-2009','9-17-2009');
sort($arr);
print_r($arr);//合并、拆分、接合、分解数组(递归合并一个或多个数组,注意键的引号)
$arr_a = array("John"=>100,"James"=>85);
$arr_b = array("Micky"=>78,"John"=>45);
$newarr = array_merge_recursive($arr_a,$arr_b);
print_r($newarr);//递归追加数组
$arr_a = array("AK"=>"xx","AV","AO","AE"); //用第一个数组的键
$arr_b = array("Akssjd"=>"xasd","Aosdwe","Aesadlkj","Avxiwqlk"); //用第二个数组的值
$newarr = array_combine($arr_a,$arr_b);
print_r($newarr);//链接两个数组(键自动顺序数字,值合并,有键的的单独显示,键相同值会覆盖)
$arr_a = array("W",a=>"O","F","R","C");
$arr_b = array("2","6","4","7","3",a=>"x","0","9");
$newarr = array_merge($arr_a,$arr_b);
shuffle($newarr); //洗牌(将数组打乱),每次结果不一样
print_r($newarr);//拆分数组
$oldarr=array("西瓜","苹果","柚子","香蕉","芒果","奇异果","山楂");
$newarr=array_slice($oldarr,2,-2); //去掉前两个,后两个
print_r($newarr); //新的数组
print_r($oldarr); //全部原始数组//接合数组(形成新两个数组)
$oldarr=array("西瓜","苹果","柚子","香蕉","芒果","奇异果","山楂");
$newarr=array_splice($oldarr,2);
print_r($newarr); //新的数组
print_r($oldarr); //被删除的数组//求数组的交际
$new_a=array("A","B","C","D","E","F"); //以"键和值"第一行数组为标准,3个数组"值"有完全相同的输出
$new_b=array("B","X","E","R","W","P");
$new_c=array("Z","N","B","W","E","C");
$newarr = array_intersect($new_a,$new_b,$new_c);
print_r($newarr);//求关联数组的交集(类似上边这个)
//array_intersect_assoc() 这个考虑"键"是都也相同,如果"键"和"值"都相同输出结果
//求数组的差集(这个与intersect()正好相反)
$new_a=array("A","B","C","D","E","F"); //以"键和值"第一行数组为标准,3个数组"值"有完全没有的输出
$new_b=array("B","X","E","R","W","P");
$new_c=array("Z","N","B","W","E","C");
$newarr = array_diff($new_a,$new_b,$new_c);
print_r($newarr);//求关联数组的交集(类似上边这个)
//array_diff_assoc() 这个考虑"键"是都也相同,如果"键"和"值"都没有输出结果
//返回一组随即的"键"
$oldarr = array("aaa"=>"dasd","bbb"=>"axsae","ccc"=>"fdvdf","ddd"=>"ewmcc");
$newarr = array_rand($oldarr,2);
print_r($newarr);//随机洗牌数组,随机打乱"值"顺序
$oldarr = array(a=>"sd","sc","xe","po","ed");
shuffle($oldarr);
print_r($oldarr);//对数组中的值求和
$oldarr = array(36,"hello",75);
$newarr = array_sum($oldarr);
print $newarr;//将数组分解为多维数组
$oldarr=array("A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R");//shuffle($oldarr); //洗下牌
$newarr=array_chunk($oldarr,4);
print_r($newarr);
/*找到数组里不存在的数字 */
$arr =array(2,3,5,7,9,11,13,14,16,23,26,28,29,31,32,33,35,37,39,41,46,49);
for($i=0;$i $randnum = rand(0,50);
if(in_array($randnum,$arr)){
break;
}else{
printf("不存在 %d
",$randnum);
}

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/371687.htmlTechArticle//读取数组 $arr=array(xx=叉叉,yy=歪歪); echo读出第一个:.$arr[xx];//统计数组个数 $array=array(aaa,bbb,ccc,ddd); echo数组个数为:.count($array).n;//计算数组单...

上一篇:

下一篇: