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 make index arrangements
Print_r ($c);
$b =array_values ($arr);//Reorder Arrays
Print_r ($b);



$arr 1=array (' Zhengzhou ', ' Hebei ', ' Shanghai ', ' Beijing ');
$arr 2=array (' Kaifeng ', ' Luoyang ', ' Puyang ');
$arr 3=array_merge ($arr 1, $arr 2);//merge array $arr1, $arr 2.
Echo '

';
Print_r ($arr 3);
 
 
 
 
 
$str = "JJJJJJ5555455CCCCDDDD565DFDDFD";
$arr =preg_split ('/\d{1,}/', $str);//Regular expressions
Print_r ($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 ';
$arr [][]=array (' hn ' = ' Henan ', ' a ', ' zz ' = ' Zhengzhou ', Array (100,200));
Echo '
';
Print_r ($arr);
echo $arr [1][0][2];
 
 
$age = $sage = $stage = 50;
Echo $age;
Echo '
';
Echo $sage;
Echo $stage;
 
 
 
 
 
Two-dimensional arrays
$arr =array (' zz ' = ' Zhengzhou ', Array (20,30,40,50), Array (60,70,80));
Echo '
';
Print_r ($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. '
';
}
}
 

$a =[10,20,30,40];
echo In_array ($a);//query whether a value exists in the array returns 1 if present
if (Array_search ($a) ===false) {
echo ' not found ';
}else {
Echo ' found, position is: '. Array_search ($a);
}


Recommended number of characters for the specified sequence
$arr =range (' A ', ' Z ');
$arr =range (1,100,3);
Echo '
';
Print_r ($arr);
Substr intercept the value, In_array determine if there is an array
$arr =array (' 12 ', ' 133 ', ' 135 ', ' 138 ');
$aa = ' 1202 ';
if (In_array (substr ($AA, 0,2), $arr)) {
echo ' presence '. $aa;
}else {
Echo ' does not exist ';
}
Is_array Judging is not an array
$arr = 20;
if (Is_array ($arr)) {
Echo ' is an array ';
Print_r ($arr);
}else {
Echo ' is not an array ';
Echo $arr;
}




Assigning 10 values (random integers between 1-100) to an empty array using a circular statement
$arr =array ();
for ($i =0; $i <10; $i + +) {
$arr []=mt_rand (1,100);
}
Echo ' sort after: ';
foreach ($arr as $v) {
echo $v. ";
}
Echo ';
Implement sort algorithm bubble sort
for ($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 ' sort after: ';
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
Declares 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);

$arr 1=array (10,52,34,40);//Declaration array
$arr 2=[10,20,30];
$arr 3=array (' bj ' = ' Beijing ', ' sh ' = ' Shanghai ');
Echo '
';
Var_dump ($arr 1);//print array and output type
Print_r ($arr 3);//Print output array
echo $arr 3[' BJ '];//output Beijing
Echo '
';
echo $arr 1[2];/output 30, starting from 0
foreach ($arr 3 as $k = = $v) {
echo $v;//output value, $k output subscript
}
$arr 3[]= ' Zhengzhou '; Adds an element to an array after the array
$arr 3[' sz ']= ' Shenzhen ';
Array_unshift ($arr 3, ' Hangzhou ', ' Qingdao ');//Add elements to the front of the array
unset ($arr 3[' BJ ');//delete the BJ element in the $ARR3 array

$BJ = Array_shift ($arr 3);//The first element in the array is removed to assign to BJ and output
Echo $BJ;
$sz =array_pop ($arr 3);//Move the last element in the array and assign a value
Echo $sz;

foreach ($arr 3 as $k = = $v) {
echo $k. ' = '. $v;
}
Sort ($arr 1);//ascending, from small to large
Rsort ($arr 1);//descending, from large to small
Print_r ($arr 1);
echo Count ($arr 1);

$a =array (4,8);
echo count ($a);//Returns the number of elements in the array 2
$str = ' Day, one, two, three, four, five, six ';
$arr =explode (', ', $str);//Divide a string into arrays by string interval
Print_r ($arr);
$w =date (' W ');
Echo ' Today is: Week '. $arr [$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 && $h <=6) {
Echo ' Late at night, please pay attention to rest ';
}elseif ($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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