php array, php array length_PHP tutorial

php array, php array length

$arr=array('zz'=>'Zhengzhou','Beijing',9=>'Shanghai','Zhengzhou');
print_r($arr);
$c=array_unique ($arr);//Eliminate duplicate element values ​​and perform index arrangement
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, in_array determines whether it exists in the array
 $arr=array('12','133', '135','138');
 $aa='1202';
 if (in_array(substr($aa,0,2),$arr)) {
 echo 'exists'.$ 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 ​​to the empty array ( Random integer between 1-100)
 $arr=array();
 for ($i=0;$i<10;$i ){
 $arr[]=mt_rand(1,100) ;
 }
 echo'After sorting:';
 foreach ($arr as $v){
 echo $v.'  ';
 }
 echo '
';

// //Implement the sorting algorithm bubble sort
 for ($m=0;$m for ($n=0;$n< ;count($arr)-1;$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);//Declaration 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 to the 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, assign it to bj and output it 
 echo $bj;
 $sz=array_pop($arr3);//Remove the last element in the array and assign value
 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 an array according to the string interval 
 // 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';
// }
?>
 


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