Note the text in the comments section Oh ~
Copy CodeThe code is as follows: Instantiate an array
$array = Array ();
The array consists of two parts as follows
Array (key name [key]=> value [value])
Key names are commonly used with indexes
type can be int or string [int is what can be found in PHP manual]
So it can be written like this
$array = Array (0=> ' a ',1=> ' B ');
You can write that too.
Array automatically complements the index key name, which defaults to an int value starting from 0
$array = Array (' A ', ' B ');
Test cannot use Echo to print an array with Print_r don't ask why.
Print_r ($array);
The output is an Array ([0] = a [1] = b)
As you can see, if you do not set the key name [key] It will automatically replenish the key
You can also change the key as you feel
$array = Array (3=> ' a ',5=> ' B ');
Print_r ($array);
Result Array ([3] = a [5] = b)
If you want to read the contents of an array, you can do this
Echo $array [3];
The result is a.
Echo is used here because as long as it is not an array, you can use echo output directly
Key can be a string
$array = Array (' AA ' = ' a ', ' bb ' = ' B ');
Print_r ($array);
The result is an array ([AA] + a [BB] = b)
So you can also echo $array [' AA ']; Note that the strings are enclosed in quotation marks
The value [value] can be a variable, which can be an array
$array = Array (0=>array (' A ', ' B '), 1=>array (' C ', ' d '));
Print_r ($array);
The result is an array ([0] = = Array ([0] = a [1] + b) [1] = = Array ([0] = = c [1] + D))
This is called a two-dimensional array
Read the contents of the inside can be like this
echo $array [0][1];
The result is that B can also be used
Of course, it could be more arrays.
$array = Array (0=>array (' A ', ' B '), Array (' C ', ' d ')), 1=>array (Array (' E ', ' f '), Array (' G ', ' h ')));
It seems a little messy, you have to slowly understand
Regression to a real application instantiate a few leases
$array = Array ();
Simulating a SQL loop SQL mostly with a while loop, I'm doing a simple for 10 cycles here
Echo '
'; Echo '
';
for ($i =0; $i <=10; $i + +) {
$array [] = Array (' name ' = ' My Name '.) $i, ' age ' = ' I am 1 '. $i);
$array [] plus bracket is for him to generate 10 arrays of 0-10 respectively
If it is $array = Array (' name ' = ' My name '. I, ' age ' = ' I am 1 '. i);
Then the result is only one array. The last one will replace the previous one.
}
Print_r ($array);
The result array ([0] = = Array ([name] = + my name 0 [age] = My years) [1] = = Array ([name] = + my name 1 [age] = I am old one) [2] = = Array ([name] = + my Name 2 [age] = My Years) [3] = = Array ([name] = + my name 3 [age] = [13] = = Array ([name] = + my name 4 [age] = my old) [5] = = Array ([name] = + my name is 5 [age] = [6] = a Rray ([name] = + my name 6 [age] = I'm old) [7] = = Array ([name] = + my name is 7 [age] = my old) [8] = = Array ([ Name] = + my name 8 [age] = I'm old) [9] = = Array ([name] = + my name is 9 [age] = I am old) [ten] = = Array ([name] = > My name is [age] and I am 110)
How to use it?
?>
foreach ($array as $value) {
Echo '
- '. $value [' name ']. ' | '. $value [' age ']. '
';
}
?>
The above results add HTML code, you extrapolate it
If you want to do an array of operations such as filtering the above $array in a total of 10 arrays, now you want to delete the key 3 of the bar
Unset ($array [3]);
Print_r ($array);
You're going to see that 3 of that is gone.
The above is a simple use, next time to say some advanced
?>
http://www.bkjia.com/PHPjc/743930.html www.bkjia.com true http://www.bkjia.com/PHPjc/743930.html techarticle Note the text in the comment section Oh ~ The Copy Code code is as follows:? PHP//Instantiate an array $array = array ();//The array consists of two parts as follows//array (key name [key]= value [value])//Key ...
