php参考手册所有Array函数简单运用下

<?php//array_change_key_case() $age=['cyg'=>"kkk","liwen"=>"70"];print_r(array_change_key_case($age,CASE_UPPER));//把键名转换成大写,默认是小写

<?php//array_chunk() $cars=array("Volvo","BMW","Toyota","Honda","Mercedes","Opel");print_r(array_chunk($cars,2));//两个元素（2）组成一个数组.形成了一个二维数组啦

<?php//array_chunk() $cars=array("Volvo","BMW","Toyota","Honda","Mercedes","Opel");print_r(array_chunk($cars,2,true));//两个元素组成一个数组，建名从0开始，递增

<?php//array_column() // 表示由数据库返回的可能记录集的数组$a = array(  array(    'id' => 5698,    'first_name' => 'Bill',    'last_name' => 'Gates',  ),  array(    'id' => 4767,    'first_name' => 'Steve',    'last_name' => 'Jobs',  ),  array(    'id' => 3809,    'first_name' => 'Mark',    'last_name' => 'Zuckerberg',  ));$last_names=array_column($a,'last_name');//取出健名是last_name的值print_r($last_names);

<?php//array_column() // 表示由数据库返回的可能记录集的数组$a = array(  array(    'id' => 5698,    'first_name' => 'Bill',    'last_name' => 'Gates',  ),  array(    'id' => 4767,    'first_name' => 'Steve',    'last_name' => 'Jobs',  ),  array(    'id' => 3809,    'first_name' => 'Mark',    'last_name' => 'Zuckerberg',  ));$last_names=array_column($a,'last_name','id');//取出last_name的值，以该二维数组的id为其对应的下标print_r($last_names);

//array_combine()

<?php$fname=array("Bill","Steve","Mark");$age=array("60","56","31");$c=array_combine($fname, $age);print_r($c);//$fname作为下标，$gae作为值

<?php$a=array("A","Pat","Dog","d","Dog");print_r(array_count_values($a));//每个元素看后面有没有一样的，有就+1//默认为1?>

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("e"=>"red","f"=>"green","g"=>"blue");$result=array_diff($a1,$a2);print_r($result);//返回两个数组中都没有的值?>

<?php$a1=array("a"=>"red","b"=>"green66","c"=>"blue","d"=>"yellow");$a2=array("a"=>"red","b"=>"green","c"=>"blue");$result=array_diff_assoc($a1,$a2);print_r($result);//比较两个数组里面的下标+值，如果不一样，就输出.

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("a"=>"red","f"=>"green","g"=>"blue");$a3=array("h"=>"red","b"=>"green","g"=>"blue");$result=array_diff_assoc($a1,$a2,$a3);print_r($result);//数组作比较,下标c和下标d都没有与其他数组的下标+值不一样，输出?>

<?php$a1=array("a"=>"red","b"=>"green66","c"=>"blue","d"=>"yellow");$a2=array("a"=>"red","b"=>"green","c"=>"blue");$result=array_diff_key($a1,$a2);print_r($result);//只比较建名

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("c"=>"yellow","d"=>"black","e"=>"brown");$a3=array("f"=>"green","c"=>"purple","g"=>"red");$result=array_diff_key($a1,$a2,$a3);print_r($result);//比较健名。下标a没有对应的下标a，下标b没有对应的下标b，下标c有可以.?>

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;//如果意义，返回0  }  return ($a>$b)?1:-1;//不相等，1或者-1的时候都会输出出来.}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("d"=>"red","b"=>"green","e"=>"blue");$result=array_diff_uassoc($a1,$a2,'myfunction');print_r($result);//以第一个数组对比其他数组。

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","b"=>"green","d"=>"blue");$a3=array("e"=>"yellow","a"=>"red","d"=>"blue");$result=array_diff_uassoc($a1,$a2,$a3,"myfunction");print_r($result);//以第一个数组与其他数组作比较，c的下标+值其他数组没有一模一样的，就输出出来啦?>

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"blue","b"=>"black","e"=>"blue");$result=array_diff_ukey($a1,$a2,"myfunction");print_r($result);//以第一个数组的为例子，第一个数组的那个下标在其他数组中没有一样的话，就输出出来?>

<?php$a1=array_fill(3,4,"blue");//下标都为blueprint_r($a1);//从下标3开始，输出四个值。+1的值

<?php$keys=array("a","b","c","d");$a1=array_fill_keys($keys,"blue");print_r($a1);//a b c d作为blue的下标，下标多少个输出多少个元素

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$result=array_flip($a1);print_r($result);//交换数组中的某一个元素的jian值+jian名。比如a=>b变成了b=>a

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("e"=>"red666","f"=>"green","g"=>"blue");$result=array_intersect($a1,$a2);print_r($result);//比较数组$a1与数组$a2相同的建值.如果相同的就输出出来(交集)?>

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("e"=>"red","f"=>"black","g"=>"purple");$a3=array("a"=>"red","b"=>"black","h"=>"yellow");$result=array_intersect($a1,$a2,$a3);print_r($result);//以$a1为例，red相同的就输出出来a=>red(交集),因为是三个数组，所以必须三个相同的建名或者建值才行?>

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("6"=>"red","b"=>"green","c"=>"blue");$result=array_intersect_assoc($a1,$a2);print_r($result);//以$a1为基准，建名+建值一样才能输出出来

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("a"=>"red","b"=>"green","g"=>"blue");$a3=array("a"=>"red","b"=>"green","g"=>"blue");$result=array_intersect_assoc($a1,$a2,$a3);print_r($result);//因为是三个数组作比较，所以三个一样的建名+建值一样才能输出出来?>

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","c"=>"blu66","d"=>"pink");$result=array_intersect_key($a1,$a2);print_r($result);//以$a1为基准，建名相同的就输出出来?>

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("c"=>"yellow","d"=>"black","e"=>"brown");$a3=array("f"=>"green","c"=>"purple","g"=>"red");$result=array_intersect_key($a1,$a2,$a3);print_r($result);//以$a1为基准，三个一样的建名才能输出?>

<?php$a=array("Volvo"=>"XC90","BMW"=>"X5");echo array_key_exists("Volvo6",$a)?"存在":"不存在";//判断数组中是否有这个健民

<?php$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");print_r(array_keys($a));//返回数组中的所有健名?>

<?php$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");print_r(array_keys($a,"Highlander"));//取出健值所对应的建名?>

<?php$a=array(10,20,30,"10");print_r(array_keys($a,"10",true));?>

<?php$a=array(10,20,30,66,"10");print_r(array_keys($a,"10",false));//返回开始到"10"的范围?>

<?phpfunction mm($v){return ($v*$v);}$a=array(1,2,3,4,5);print_r(array_map("mm",$a));//通过mm函数，返回新的数组

<?php$a1=array("Dog","Cat","cyg");$a2=array("Puppy","Kitten","liwen");print_r(array_map(null,$a1,$a2));//两个数组通过array_map函数返回二维数组，第一个二维数组$a1[0],$a2[0].第一个二维数组$a1[1],$a2[1].以此类推

<?php$a1=array("Dog","Cat","cyg");$a2=array("Puppy","Kitten","liwen");print_r(array_merge($a1,$a2));//把两个数组合并为一个数组。下标是从0开始，随着·元素的多少而递增

<?php$a1=array("a"=>"red","b"=>"green");$a2=array("c"=>"blue","b"=>"yellow");print_r(array_merge($a1,$a2));//相同的下标都会后面的覆盖。合并两个数组

<?php$a=array(3=>"red",4=>"green");print_r(array_merge($a));//合并下标是从零开始的?>

<?php$a1=array("a"=>"red","b"=>"green");$a2=array("c"=>"blue","b"=>"yellow");print_r(array_merge_recursive($a1,$a2));//这个函数合并的如果有一样的下标会形成二维数组哦?>

<?php$a=array("Dog","Cat","Horse","Bear","Zebra");//$b=array_multisort($a);//返回1array_multisort($a);print_r($a);//开首字母进行排序

<?php$a1=array("Dog","Dog","Cat");$a2=array("Pluto","Fido","Missy");array_multisort($a1,SORT_ASC,$a2,SORT_DESC);print_r($a1);//$a1进行升序排序，print_r($a2);//$a2进行降序排序

<?php$a1=array(1,30,15,7,25);$a2=array(4,30,20,41,66);$num=array_merge($a1,$a2);array_multisort($num,SORT_DESC,SORT_NUMERIC);print_r($num);//合并两个数组，按数字进行降序排序

<?php$a=array("red","green");print_r(array_pad($a,5,"blue"));//五个元素，不足的按照blue来填充

<?php$a=array("red","green");print_r(array_pad($a,-5,"blue"));//五个元素，不足的按照blue来填充,-代表填充前面

<?php$a=array("red","green","blue");array_pop($a);print_r($a);//删除最后一个元素?>

<?php$a=array(5,5);echo(array_product($a));//计算数组的乘积?>

<?php$a=array("red","green");array_push($a,"blue","yellow");print_r($a);//往数组的尾部插入blue+yellow?>

<?php$a=array("red","green","blue","yellow","brown");//你刷新几次结果都会不一样哦$b=array_rand($a,3);echo $a[$b[0]]."
";echo $a[$b[1]]."
";echo $a[$b[2]]."
";//返回三个数组元素，刷新效果会不一样

<?php$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");//刷新几次效果都会不一样print_r(array_rand($a,1));//返回下标.每次刷新只返回一个元素的下标

<?php$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");print_r(array_rand($a,2));//返回两个元素.下标是依次递增，从0开始

<?phpfunction myfunction($v1,$v2){return $v1 . "-" . $v2;}$a=array("Dog","Cat","Horse");print_r(array_reduce($a, "myfunction",15));//返回把数组转换成字符串

<?php$a1=array("red","green","blue","yellow");$a2=array(0=>"orange",3=>"burgundy");print_r(array_replace($a1,$a2));//后面的覆盖前面的?>

<?php$a1=array("a"=>array("red"),"b"=>array("green","blue"),);$a2=array("a"=>array("yellow"),"b"=>array("black"));print_r(array_replace_recursive($a1,$a2));//相同关联下标的，会转换成二维数组，二维数组中，举个例子，yellow替换掉red。black替换掉green。效果如下

<?php$a1=array("a"=>array("red"),"b"=>array("green","blue"));$a2=array("a"=>array("yellow"),"b"=>array("black"));$a3=array("a"=>array("orange"),"b"=>array("burgundy"));print_r(array_replace_recursive($a1,$a2,$a3));//三个数组关联数组会转换成二维数组，相同下标的后面会覆盖前面的，比如orange覆盖red yellow?>

<?php$a=array("a"=>"Volvo","b"=>"BMW","c"=>"Toyota");print_r(array_reverse($a));//倒序输出关联数组

<?php$a=array("Volvo","XC90",array("BMW","Toyota"));$preserve=array_reverse($a,true);print_r($preserve);//下标从高到底排序。?>

<?php$a=array("a"=>"red","b"=>"green","c"=>"blue");echo array_search("red",$a);//元素值的下标是啥？

<?php$a=array("a"=>"5","b"=>5,"c"=>"5");echo array_search(5,$a,true);//健值的下标是啥？

<?php$a=array("a"=>"red","b"=>"green","c"=>"blue");echo array_shift($a);//删除掉第一个元素print_r($a);

<?php$a=array("red","green","blue","yellow","brown");print_r(array_slice($a,2));//从第一个元素开始，删除两个元素

<?php$a=array("red","green","blue","yellow","brown");print_r(array_slice($a,1,2));//输出$a[1]+$a[2]这两个元素

<?php$a=array("red","green","blue","yellow","brown");print_r(array_slice($a,-2,1));//-2代表从后面往前数。-1==brown。yellow代表-2。1代表取出一个元素

<?php$a=array("red","green","blue","yellow","brown");print_r(array_slice($a,1,2));//从$a[1]开始取出两个元素

<?php$a=array("red","green","blue","yellow","brown");print_r(array_slice($a,2,2,true));//从$a[2]开始取出两个元素，true代表在原数组中是什么下标输出就是什么下标

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array("a"=>"purple","b"=>"orange");array_splice($a1,0,3,$a2);//从0开始，删除三个元素print_r($a1);

<?php$a1=array("0"=>"red","1"=>"green");$a2=array("0"=>"purple","1"=>"orange");array_splice($a1,1,0,$a2);//从1开始，删除0个元素.代表合并print_r($a1);?>

<?php$a=array("a"=>52.2,"b"=>13.7,"c"=>0.9);echo array_sum($a);//元素值相加

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;//0代表相等  }  return ($a>$b)?1:-1;//1或者-1都是输出的值}$a1=array("a"=>"black","b"=>"green","c"=>"blue");$a2=array("a"=>"blue","b"=>"black","e"=>"blue");$result=array_udiff($a1,$a2,"myfunction");//只比较键值。两个数组，值一样不输出，独一无二的值就输出。（差值）print_r($result);

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;//相等就都不输出  }  return ($a>$b)?1:-1;//不相等的都输出(差值)}$a1=array("a"=>"red","b"=>"green","c"=>"blue","yellow");$a2=array("A"=>"red","b"=>"GREEN","yellow","black");$a3=array("a"=>"green","b"=>"red","yellow","black");$result=array_udiff($a1,$a2,$a3,"myfunction");print_r($result);//三个数组，大小写不区分。//只比较键值。三个数组，值一样不输出,举个例子，$a1+a2+$a3都有green就不输出。只有$a2+$a3有black就输出.?>

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","b"=>"blue","c"=>"green");$result=array_udiff_assoc($a1,$a2,"myfunction");print_r($result);//比较键值+键名都一样就输出。一样就输出

<?phpfunction myfunction_key($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}function myfunction_value($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","b"=>"green","c"=>"green");$result=array_udiff_uassoc($a1,$a2,"myfunction_key","myfunction_value");print_r($result);//比较两个数组的键名和键值.第一个函数比较键名，第二个函数比较键值！

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"green","b"=>"black","e"=>"blue");$result=array_uintersect($a1,$a2,'myfunction');print_r($result);//只比较键值。交集的这种，键值一样就输出

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue","yellow");$a2=array("A"=>"red","b"=>"GREEN","yellow","black");$a3=array("a"=>"green","b"=>"red","yellow","black");$result=array_uintersect($a1,$a2,$a3,"myfunction");print_r($result);//返回交集，什么叫做交集，就是每个数组都有的叫做交集。只比较键值?>

<?phpfunction myfunction($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","b"=>"blue","c"=>"green");$result=array_uintersect_assoc($a1,$a2,"myfunction");print_r($result);//比较键值+键名。每个数组都有的叫做交集?>

<?phpfunction myfunction_key($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}function myfunction_value($a,$b){if ($a===$b)  {  return 0;  }  return ($a>$b)?1:-1;}$a1=array("a"=>"red","b"=>"green","c"=>"blue");$a2=array("a"=>"red","b"=>"green","c"=>"green");$result=array_uintersect_uassoc($a1,$a2,"myfunction_key","myfunction_value");print_r($result);//第一个函数比较名，第二个比较值.比较每个数组都有的元素就输出。比较交集?>

<?php$a=array("a"=>"red","b"=>"green","c"=>"red");print_r(array_unique($a));//如果有重复的元素，只保留第一个

<?php$a=array("a"=>"red","b"=>"green");array_unshift($a,"blue");print_r($a);//不需要赋值。blue放在开头。

<?php$a=array(0=>"red",1=>"green");array_unshift($a,"blue");print_r($a);//插入到开头，其他的下标后移一位?>

<?php$a=array("Name"=>"Bill","Age"=>"60","Country"=>"USA");print_r(array_values($a));//返回数组所有的值。下标是数字

<?phpfunction myfunction($value,$key){echo "The key $key has the value $value
";}$a=array("a"=>"red","b"=>"green","c"=>"blue");array_walk($a,"myfunction");//对数组中每一个元素都引用到函数中的变量中

<?phpfunction myfunction(&$value,$key){ $value="yellow";}$a=array("a"=>"red","b"=>"green","c"=>"blue");array_walk($a,"myfunction");print_r($a);//更改数组元素的<<>>?>

<?phpfunction myfunction($value,$key){echo "键 $key 的值是 $value 。
";}$a1=array("a"=>"red","b"=>"green");$a2=array($a1,"1"=>"blue","2"=>"yellow");array_walk_recursive($a2,"myfunction");//优点:可以操作二维三维数组

<?php$age=array("Bill"=>"0","Steve"=>"56","Mark"=>"31");arsort($age);foreach ($age as $key => $value) {# code...echo $key."
  ";echo $value;//降序}//arsort这个函数使用后，foreach才能正常使用

<?php$age=array("Bill"=>"60","Steve"=>"56","Mark"=>"31");asort($age);foreach ($age as $key => $value) {# code...echo $key."
  ";echo $value;//升序}//asort这个函数使用后，foreach才能正常使用

<?php$firstname = "Bill";$lastname = "Gates";$age = "60";$result=compact("firstname", "lastname", "age");print_r($result);//变量变成下标，赋值的是键值

<?php$firstname = "Bill";$lastname = "Gates";$age = "60";$location;$name = array("firstname", "lastname");$result = compact($name, "location", "age");print_r($result);//变量变成下标，赋值的是键值,没有赋值的变量是没有作用的?>

<?php$cars=array("Volvo","BMW","Toyota");echo count($cars);//返回元素的数目,从1开始

<?php$cars=array  (  "Volvo"=>array  (  "XC60",  "XC90"  ),  "BMW"=>array  (  "X3",  "X5"  ),  "Toyota"=>array  (  "Highlander"  )//能递归，也就是说能数到二维三维数组即以上  );  echo count($cars,1);

<?php$people = array("Bill", "Steve", "Mark", "David");echo current($people) . "
";//这里指向开头的元素echo next($people) . "
";//（下一个）这里指向开头的第二个元素echo end($people) . "
";//指向最后的元素echo prev($people)."
";//这里指向第二个元素（上一个）echo reset($people)."
";//第一个元素

<?php$people = array("Bill", "Steve", "Mark", "David");reset($people);//指向开头第一个数组元素print_r(each($people));//输出结果后Bill，往前面移动，也就是"Steve"echo "
";while (list($key,$val)=each($people)) {echo "$key=>$val
";//直到$people里面没有值之后，返回false就停止}

<?php$people = array("Bill", "Steve", "Mark", "David");echo current($people) . "
";//当前指针指向的元素.默认的，就是第一个元素echo end($people);//最后一个

<?php$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");extract($my_array);echo "\$a=$a;\$b=$b;\$c=$c";//\转义之后，左边变成变量。右边是值//这个函数把数组左边变成变量名，右边是变量值

<?php$a = "Original";$my_array = array("a" => "Cat", "b" => "Dog", "c" => "Horse");extract($my_array, EXTR_PREFIX_SAME, "dup");//如果某个变量名有冲突，就加dup前缀echo "\$a = $a; \$b = $b; \$c = $c; \$dup_a = $dup_a";

<?php$people = array("Bill", "Steve", "Mark", "David");if (in_array("23", $people, TRUE))//设置true代表类型+值都要相同  {  echo "匹配已找到
";  }else  {  echo "匹配未找到
";  }if (in_array("Mark",$people, TRUE))  {  echo "匹配已找到
";  }else  {  echo "匹配未找到
";  }if (in_array(23,$people, TRUE))  {  echo "匹配已找到
";  }else  {  echo "匹配未找到
";  }?>

<?php$people = array("Bill", "Steve", "Mark", "David");echo "键的当前位置是:".key($people);

<?php$age=array("Bill"=>"60","Steve"=>"56","mark"=>"31");krsort($age);//根据键名对数组进行降序排序(ascll码进行排序的哈举个例子，a=>97......)foreach($age as $x=>$x_value)    {    echo "Key=" . $x . ", Value=" . $x_value;    echo "
";    }?>

<?php$age=array("Bill"=>"60","Steve"=>"56","mark"=>"31");ksort($age);;//根据键名对数组进行升序排序(ascll码进行排序的哈举个例子，a=>97......)foreach($age as $x=>$x_value)    {    echo "Key=" . $x . ", Value=" . $x_value;    echo "
";    }?>

<?php$my_array = array("Dog","Cat","Horse");list($a,$b,$c)=$my_array;//把数组中的键值赋值给list中的变量，依次赋值echo "I have several animals, a $a, a $b and a $c.";

<?php$temp_files = array("temp15.txt","Temp10.txt","temp1.txt","Temp22.txt","temp2.txt");natsort($temp_files);//区分大小写(升序)大写的就是比小写的大，然后后面业比较数字print_r($temp_files);natcasesort($temp_files);print_r($temp_files);//不区分大小写，（升序），大小写一样，比较的是数字。自然排序

<?php$temp_files = array("temp15.txt","Temp10.txt","temp1.txt","Temp22.txt","temp2.txt");sort($temp_files);print_r($temp_files);//升序/*他们是这样比较的，比如  array("temp15.txt","Temp10.txt","temp1.txt","Temp22.txt","temp2.txt");比如temp15.txt和temp2.txt，他会怎么比呢？temp1与temp2那个大?那个大，就那个靠前，这样子的啦 */

<?php$people = array("Bill", "Steve", "Mark", "David");echo pos($people);//pos的意思相当于current()

<?php$number=range(0,5);print_r($number);//0到5这个范围，包括0和5

<?php$number=range(0,5,2);print_r($number);//数字只在0到5这个范围，包括0和5。递增的速度是+2

<?php$cars=array("Volvo","BMW","Toyota");rsort($cars);//逆向排序后，需要count获取总数，然后for遍历出来就行$length=count($cars);for($x=0;$x<$length;$x++)   {   echo $cars[$x];   echo "
";   }?>

<?php$my_array = array("red","green","blue","yellow","purple");shuffle($my_array);print_r($my_array);//对数组之后的元素随机排序，刷新一次一次效果哦

<?php$my_array = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow","e"=>"purple");shuffle($my_array);print_r($my_array);//对数组之后的元素随机排序,针对的是键值

<?php$cars=array  (  "Volvo"=>array  (  "XC60",  "XC90"  ),  "BMW"=>array  (  "X3",  "X5"  ),  "Toyota"=>array  (  "Highlander"  )  );echo "常规计数：" . sizeof($cars)."
";echo "递归计数：" . sizeof($cars,1);//二三维数组都可以遍历,count()的别名?>

<?php$cars=array("Volvo","BMW","Toyota");sort($cars);//对字母进行排序，a每一个元素的scll码想加起来$clength=count($cars);for($x=0;$x<$clength;$x++)   {   echo $cars[$x];   echo "
";   }?>

<?phpfunction my_sort($a,$b){if ($a==$b) return 0;return ($a<$b)?-1:1;}$arr=array("a"=>4,"b"=>2,"c"=>8,d=>"6");uasort($arr, "my_sort");foreach($arr as $x=>$x_value)    {    echo "Key=" . $x . ", Value=" . $x_value;    echo "
";    }//根据键值进行升序，不区分类型?>

<?phpfunction my_sort($a,$b){if ($a==$b) return 0;return ($a<$b)?-1:1;}$arr=array("a"=>4,"b"=>2,"c"=>8,d=>"6");uksort($arr,"my_sort");foreach($arr as $x=>$x_value)//根据键名进行排序。ascll。比如a=97 b=98.....升序    {    echo "Key=" . $x . ", Value=" . $x_value;    echo "
";    }?>

<?phpfunction my_sort($a,$b){if ($a==$b) return 0;   return ($a<$b)?-1:1;}$a=array(4,2,8,6);usort($a,"my_sort");$arrlength=count($a);for($x=0;$x<$arrlength;$x++)   {   echo $a[$x];//对元素进行排序，先函数，然后count下，然后遍历   echo "
";   }?>