php参考手册Array函数(完结了)
<?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($result);//比较健名。下标a没有对应的下标a，下标b没有对应的下标b，下标c有可以.
?>
<?php
function myfunction($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。
<?php
function 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($result);//以第一个数组与其他数组作比较，c的下标+值其他数组没有一模一样的，就输出出来啦
?>
<?php
function myfunction($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
$a1=array_fill(3,4,"blue");//下标都为blue
print_r($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
?>
<?php
function 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($a);//返回1
array_multisort($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]]."<br />";
echo $a[$b[1]]."<br />";
echo $a[$b[2]]."<br />";
//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
<?php
function 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
<?php
function 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);
<?php
function 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+$a3有black就输出.
?>
<?php
function myfunction($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
<?php
function 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！
<?php
function 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
<?php
function 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($result);//返回交集，什么叫做交集，就是每个数组都有的叫做交集。只比较键值
?>
<?php
function myfunction($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
?>
<?php
function 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
<?php
function myfunction($value,$key)
{
echo "The key $key has the value $value<br>";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");//对数组中每一个元素都引用到函数中的变量中
<?php
function myfunction(&$value,$key)
{
$value="yellow";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
print_r($a);//更改数组元素的<<<值>>>
?>
<?php
function myfunction($value,$key)
{
echo "键 $key 的值是 $value 。<br>";
}
$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."<br /> ";
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."<br /> ";
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) . "<br>";//这里指向开头的元素
echo next($people) . "<br>";//（下一个）这里指向开头的第二个元素
echo end($people) . "<br>";//指向最后的元素
echo prev($people)."<br>";//这里指向第二个元素（上一个）
echo reset($people)."<br >";//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($people));//输出结果后Bill，往前面移动，也就是"Steve"
echo "<br >";
while (list($key,$val)=each($people)) {
echo "$key=>$val<br>";//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) . "<br>";//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", $people, TRUE))//设置true代表类型+值都要相同
{
echo "匹配已找到<br>";
}
else
{
echo "匹配未找到<br>";
}
if (in_array("Mark",$people, TRUE))
{
echo "匹配已找到<br>";
}
else
{
echo "匹配未找到<br>";
}
if (in_array(23,$people, TRUE))
{
echo "匹配已找到<br>";
}
else
{
echo "匹配未找到<br>";
}
?>
<?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 "<br>";
}
?>
<?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 "<br>";
}
?>
<?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 "<br>";
}
?>
<?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)."<br>";
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 "<br>";
}
?>
<?php
function 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=" . $x_value;
echo "<br>";
}//根据键值进行升序，不区分类型
?>
<?php
function my_sort($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=" . $x_value;
echo "<br>";
}
?>
<?php
function my_sort($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 "<br>";
}
?>
本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2022-04-29，如有侵权请联系 cloudcommunity@tencent.com 删除
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