php array

$arr=array('zz'=>'Zhengzhou','Beijing',9=>'Shanghai','Zhengzhou');
print_r($arr);
$c=array_unique($arr);//Eliminate duplicate element values ​​and arrange by index
print_r($c);
$b=array_values($arr);//Reorder the array
print_r($b);



$arr1=array('Zhengzhou','Hebei','Shanghai','Beijing');
$arr2=array('Kaifeng','Luoyang','Puyang');
$arr3=array_merge($arr1,$arr2);//Merge arrays $arr1,$arr2.
echo '

';

print_r($arr3);











$str="jjjjjj5555455ccccdddd565dfddfd";

$arr=preg_split('/d{1,}/', $str);//regular expression

print_r($arr);







$st="Beijing, Shanghai, Tianjin, Zhengzhou, Guangdong";

$arr=explode(',', $st);

print_r($arr);

$ss=implode("====",$arr);

echo '
';


echo $ss;

foreach ($arr as $v){

echo '
';

echo $v;

}







$arr[][]='ok';

$arr[][]=[10,20,30];

$arr[][]='hello';

$arr[][]=array('hn'=>'Henan',60,'zz'=>'Zhengzhou',array(100,200));

echo '
';

print_r($arr);

echo $arr[1][0][2];





$age=$sage=$stage=50;


echo $age;

echo '
';

echo $sage;

echo $stage;











//two-dimensional array

$arr=array(10,'zz'=>'Zhengzhou',array(20,30,40,50),array(60,70,80));

echo '
';

print_r($arr);

echo $arr[2][0];

echo sizeof($arr,1);

echo count($arr);

foreach($arr as $v){

if(!is_array($v)){

echo $v.'
';

continue;

}

foreach ($v as $vv){

echo $vv.'
';

}

}




$a=[10,20,30,40];

echo in_array(20, $a);//Query whether a value in the array exists, if it exists, return 1

if (array_search(20, $a)===false){

echo 'not found';

}else {

echo 'Found, the location is:'.array_search(20, $a);

}





//It is recommended to specify the number of characters in the sequence

$arr=range('a','z');

$arr=range(1,100,3);

echo '
';

print_r($arr);

substr intercepts the value and in_array determines whether it exists in the array

$arr=array('12','133','135','138');

$aa='1202';

if (in_array(substr($aa,0,2),$arr)) {

echo 'exist'.$aa;

}else {

echo 'does not exist';

}


​


​


is_array determines whether it is an array

$arr=20;

if (is_array($arr)){

echo 'is an array';

print_r($arr);

}else {

echo 'not an array';

echo $arr;

}









//Use a loop statement to assign 10 values ​​​​(random integers between 1-100) to the empty array

$arr=array();

for ($i=0;$i<10;$i++){

$arr[]=mt_rand(1,100);

}

echo'After sorting:';

foreach ($arr as $v){


echo $v.'  ';

}

echo '
';


// //Implement sorting algorithm bubble sort

for ($m=0;$m
for ($n=0;$n
if ($arr[$n]>$arr[$n+1]){

$t = $arr[$n];

$arr[$n]=$arr[$n+1];

$arr[$n+1]=$t;

}



}

}


echo'After sorting:';

foreach ($arr as $v){

echo $v.'  ';

}




$arr=array();

$arr[]=10;

$arr[]=20;

$arr[]=30;

$arr[]=40;

$arr[]=50;

echo $arr[2];


​


​


​


echo rand(1,3).','.rand().','.rand(10,100);//Random number

echo mt_rand(1,100).'--'.mt_rand().'--'.mt_rand(1,3);//Generate better random numbers


​


​


//Declare an array randomly assigned to integers in the range of 10 numbers (1-100) 

$arr=array();

for ($i=0;$i<10;$i++){

$arr[]=mt_rand(1,100);

}

echo '
';

print_r($arr);




sort($arr);//Output array after sorting

print_r($arr);


​




$arr1=array(10,52,34,40);//Declare the array

$arr2=[10,20,30];

$arr3=array('bj'=>'Beijing','sh'=>'Shanghai');

echo '
';

var_dump($arr1);//Print the array and output type

print_r($arr3);//Print output array


echo $arr3['bj'];//Output Beijing

echo '
';

echo $arr1[2];/output 30, starting from 0


foreach ($arr3 as $k=>$v){

echo $v;//Output value, $k output subscript 

}

$arr3[]='Zhengzhou'; //Add elements to the array at the back of the array

$arr3['sz']='Shenzhen';

array_unshift($arr3,'Hangzhou','Qingdao');//Add elements in front of the array

unset($arr3['bj']);//Delete the bj element in the $arr3 array




$bj= array_shift($arr3);//Remove the first element in the array, take it out, assign it to bj and output 

echo $bj;


$sz=array_pop($arr3);//Remove the last element in the array and assign it 

echo $sz;




foreach ($arr3 as $k=>$v){

echo $k.'=>'.$v;

}


​


sort($arr1);//Ascending order, from small to large

rsort($arr1);//Descending order, from large to small

print_r($arr1);

echo count($arr1);


​


​


​




$a=array(4,8);

echo count($a);//returns the number of elements in the array 2


​


$str='Day, one, two, three, four, five, six';

$arr=explode(',',$str); // Divide a string into arrays according to string intervals

// print_r($arr);

$w=date('w');

echo 'Today is: Sunday'.$arr[$w];


​


$h=date('G');

// if ($h>=8 && $h<=12) {

// echo 'Good morning';

// }else if ($h>=13 && $h<=18){

// echo 'Good afternoon';

// }else if ($h>=19 && $h<=21){

// echo 'Good evening';

// }elseif ($h>=22 && $h<=6){

// echo 'It's late at night, please take a rest';

// }elseif ($h>=6 && $h<=7){

// echo 'Good morning';

// }


​




// echo date ( 'Y-m-d H:i:s' );

// $d = date ( 'w' );

// if ($d == 0) {

// echo 'Today: Sunday';

// }

// if ($d == 1) {

// echo 'Today: Monday';

// }

// if ($d == 2) {

// echo 'Today: Tuesday';

// }

// if ($d == 3) {

// echo 'Today: Wednesday';

// }

// if ($d == 4) {

// echo 'Today: Thursday';

// }

// if ($d == 5) {

// echo 'Today: Friday';

// }

// if ($d == 6) {

// echo 'Today: Saturday';

// }


?>

                
                
                

                    The above introduces PHP arrays, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.