PHP Common Development function Parsing array Chapter [unfinished]_php tutorial

One, array processing function:
The feeling of intoxication: array processing functions are very common in PHP development, and it is important to learn good array processing functions. Array processing functions are involved in practical applications: array creation, string-to-array conversion, array-to-XML, Array to JSON. Array detection. Arrays are merged into the split. The number of arrays. Gets all the values in the array, gets all the key values in the array [subscript]
1. Create an array:
$new = Array ();
2. Implode (delimited, str) connect the array value data as specified characters
Copy CodeThe code is as follows:
$arr = Array (' Hello ', ' world! ', ' Beautiful ', ' day! ');
echo Implode ("", $arr); output
Hello world! Beautiful day!

3.count (arr) calculates the number of cells in an array or the number of properties in an object
4.is_array (ARR) detects if a variable is an array
The 5.array_rand () function randomly selects one or more elements from the array and returns them.
Copy CodeThe code is as follows:
$a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse");
Print_r (Array_rand ($a, 1));

Output: b
Copy CodeThe code is as follows:
$a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse");
Print_r (Array_rand ($a, 2)); View Code
Array ([0] = c [1] = b)

The 6.array_sum () function returns the sum of all the values in the array.
Copy CodeThe code is as follows:
$a =array (0=> "5",1=> ",2=>" 25 ");
echo array_sum ($a);

Output: 45
The 7.array_slice () function takes a value out of the array and returns it as a condition.
Copy CodeThe code is as follows:
$a =array (0=> "Dog",1=> "Cat",2=> "Horse",3=> "Bird");
Print_r (Array_slice ($a,)); View Code
Array ([0] = Cat [1] = Horse)

The 8.array_count_values () function is used to count the occurrences of all values in an array.
Copy CodeThe code is as follows:
$a =array ("Cat", "Dog", "Horse", "dog");
Print_r (Array_count_values ($a)); output:
Array ([Cat] = 1 [Dog] = 2 [Horse] + 1)

3. Array to XML
Copy CodeThe code is as follows:
function Array2xml ($array, $tag) {
function Ia2xml ($array) {
$xml = "";
foreach ($array as $key = = $value) {
if (Is_array ($value)) {
$xml. = "< $key >". Ia2xml ($value). " ";
} else {
$xml. = "< $key >". $value. " ";
}
}
return $xml;
}
Return simplexml_load_string ("< $tag >". Ia2xml ($array). " ");
}
$test [' type ']= ' lunch ';
$test [' Time ']= ' 12:30 ';
$test [' Menu ']=array (' entree ' = ' salad ', ' maincourse ' = ' steak ');
Echo Array2xml ($test, "meal")->asxml ();

Output:
Copy CodeThe code is as follows:


Lunch
12:30

Salad
Steak

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