Describes the very useful array function (reprint) associative array in several PHP4 equivalent to a hash array in Perl. I used to think that PHP didn't ...

Source: Internet
Author: User
Tags array compact hash mixed sort variable
perl| Function | Array describes the very useful "array" functions in several PHP4

1 void Extract (array var_array [, int extract_type] [, string prefix]])
Expands an associative array to the variable name and the value of the variable, and if there is a conflict, the following argument specifies the processing Method!
Such as:


/* Suppose that $var _array is a array returned from
Wddx_deserialize *

$size = "large";
$var _array = Array ("Color" => "Blue",
"Size" => "medium",
"Shape" => "sphere");
Extract ($var _array, Extr_prefix_same, "WDDX");

Print "$color, $size, $shape, $wddx _sizen";


2 Array Compact (mixed varname [, mixed ...])
Instead of the above function, save the variable name and the value of the variable to the associative array!
Such as:
$city = "San Francisco";
$state = "CA";
$event = "SIGGRAPH";

$location _vars = Array ("City", "state");

$result = Compact ("event", "Nothing_here", $location _vars);

$result result is Array ("event" => "SIGGRAPH", "City" => "San Francisco", "state" => "CA").

3 bool In_array (mixed needle, array haystack)
To determine if there is a value in the array

4 void Natsort (array array)
Sort the array in natural numbers, when 12 will be at the back of 2
$array 1 = $array 2 = Array ("Img12.png", "Img10.png", "Img2.png", "img1.png");

Sort ($array 1);
echo "standard sort n";
Print_r ($array 1);

Natsort ($array 2);
echo "N natural sort N";
Print_r ($array 2);

The code output is:

Standard sort
[0] => Img1.png
[1] => Img10.png
[2] => img12.png
[3] => Img2.png

Natural sort
[3] => Img1.png
[2] => img2.png
[1] => Img10.png
[0] => Img12.png

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